Carpet Area Calculator – Sq Ft, Waste & Cost

Calculate how much carpet you need in square feet, square yards, and linear feet. Enter your room dimensions to estimate carpet quantity, account for waste, compare carpet roll layouts, and calculate an estimated carpet cost.

Whether you’re carpeting one bedroom, several rooms, a hallway, stairs, or an entire home, this carpet calculator can help you estimate the amount of material you’ll need before purchasing.

Important: Floor area and carpet purchasing quantity are not always the same. The final amount of broadloom carpet can depend on roll width, seams, pattern repeat, pile direction, room shape, and installation layout.

Carpet Calculator

Quick calculation

Enter:

• Room length
• Room width
• Measurement unit
• Carpet roll width
• Waste allowance
• Carpet price, if known

The calculator can estimate:

• Floor area
• Square feet
• Square yards
• Carpet with waste
• Linear feet of carpet
• Estimated material cost
• Padding requirement
• Estimated total project cost

For multiple rooms, add each room separately for a more useful overall estimate.

Calculator result guide

Floor Area
The actual area of floor that needs carpeting.

Square Yards
Your square-foot measurement divided by 9.

Waste Allowance
Additional material allowed for cutting and installation.

Carpet Required
The estimated amount of carpet material needed based on the selected calculation method.

Linear Feet
The length of carpet required from a roll of the selected width.

Estimated Cost
The estimated carpet quantity multiplied by the price you enter.

How Does a Carpet Calculator Work?

A basic carpet calculator starts with the area of the floor.

For a rectangular room:

\(\text{Floor Area}=\text{Length}\times\text{Width}\)

If the measurements are in feet, the result is square feet.

For example, a room measuring 12 feet by 15 feet has:

\(12\text{ ft}\times15\text{ ft}=180\text{ ft}^2\)

To convert square feet into square yards:

\(\text{Square Yards}=\frac{\text{Square Feet}}{9}\)

Therefore:

\(180\text{ ft}^2\div9=20\text{ yd}^2\)

So the room has a floor area of:

\(180\text{ ft}^2=20\text{ yd}^2\)

That’s the easy part.

The more important question is:

How much carpet do you actually need to purchase?

That depends on how the carpet comes off the roll.

Floor Area vs. Carpet Quantity

These terms are sometimes used interchangeably, but they aren’t necessarily the same.

Floor area

The amount of physical floor that needs to be covered.

Carpet quantity

The amount of carpet material required to cover that floor after considering the way the carpet must be cut and installed.

For example, imagine a room with 500 square feet of floor area.

You might initially estimate:

500 sq ft of carpet

But if the carpet is supplied on a 12-foot-wide roll and the room dimensions require multiple pieces, you may need more than 500 square feet of material.

The difference can result from:

• Roll width
• Cutting
• Seams
• Room shape
• Pattern matching
• Pile direction
• Doorways
• Closets
• Hallways
• Stairs

This is why a professional carpet estimate should consider more than floor area alone.

How to Calculate Carpet Area

For a simple rectangular room, use:

Carpet Area Formula

Suppose your room is:

\(14\text{ ft}\times12\text{ ft}\)

Then:

\(14\text{ ft}\times12\text{ ft}=168\text{ ft}^2\)

The room therefore has 168 square feet of floor area.

To convert that to square yards:

\(168\text{ ft}^2\div9=18.67\text{ yd}^2\)

So:

\(168\text{ ft}^2\approx18.67\text{ yd}^2\)

If you’re doing a quick budget estimate, this gives you the basic quantity.

For purchasing, however, continue to the roll-width and waste calculations.

How to Calculate Carpet in Square Yards

Carpet is often quoted in square yards, although square-foot pricing is also common.

The conversion is:

\(1\text{ yd}^2=9\text{ ft}^2\)

Therefore:

Square Yards Formula

And:

Square Feet Formula

Example

Suppose your total floor area is 900 square feet.

\(900\text{ ft}^2\div9=100\text{ yd}^2\)

Therefore:

\(900\text{ ft}^2=100\text{ yd}^2\)

This conversion is especially useful when comparing quotes from different carpet suppliers.

Square Feet to Square Yards Carpet Conversion Chart

Square Feet	Square Yards
50	5.56
75	8.33
100	11.11
120	13.33
144	16.00
150	16.67
180	20.00
200	22.22
250	27.78
300	33.33
400	44.44
500	55.56
750	83.33
1,000	111.11
1,500	166.67
2,000	222.22

Remember:

\(\text{Square yards}=\frac{\text{Square feet}}{9}\)

How Much Carpet Do I Need?

For a simple rectangular room, start with the floor area.

For example:

\(10\text{ ft}\times12\text{ ft}=120\text{ ft}^2\)

The floor area is 120 square feet.

In square yards:

\(120\text{ ft}^2\div9\approx13.33\text{ yd}^2\)

You can then add a planning allowance for waste.

For example, with 10%:

\(120\text{ ft}^2\times1.10=132\text{ ft}^2\)

So the percentage-based estimate becomes:

132 sq ft

or:

14.67 sq yd

But don’t automatically assume that 10% is the correct amount for every installation.

The carpet roll layout may produce a different requirement.

Carpet Waste Calculator

Carpet waste is material that cannot become part of the finished installation because of cutting, room geometry, pattern matching, seams, or other installation requirements.

A simple waste calculation is:

Waste-Adjusted Carpet Area Formula

Example

Floor area:

600 sq ft

Waste:

10%

Calculation:

\(600\text{ ft}^2\times1.10=660\text{ ft}^2\)

Therefore, a percentage-based estimate is:

660 sq ft

In square yards:

\(660\text{ ft}^2\div9\approx73.33\text{ yd}^2\)

How much carpet waste should you allow?

For a straightforward rectangular installation, a planning allowance of around 5% to 10% may be useful.

More complicated installations may require 10% to 15% or more.

However, these are planning ranges—not universal installation requirements.

The correct quantity depends on the actual cutting plan.

Why 10% Waste Isn’t Always the Answer

One of the most common carpet-calculation shortcuts is:

“Calculate the room’s square footage and add 10%.”

This is convenient, but broadloom carpet doesn’t behave like a purely area-based product.

A carpet roll has a fixed width.

Suppose your carpet is 12 feet wide.

A room that is 10 feet wide may allow a very efficient cut.

A room that is 14 feet wide cannot be covered with one 12-foot-wide piece.

The second room may require multiple pieces and a seam.

Therefore, two rooms with similar square footage can have different purchasing requirements.

The best approach is to use percentage-based waste for quick budgeting and a roll-aware layout for more precise purchasing estimates.

Why Carpet Roll Width Matters

Broadloom carpet is supplied in rolls rather than as an unlimited sheet of arbitrary dimensions.

A common broadloom width is 12 feet, although other widths are available depending on the product.

This creates an important calculation:

Floor area

versus

Material consumed from the roll

Suppose a room is:

12 × 15 ft

Floor area:

180 sq ft

If the carpet is 12 feet wide, the room can potentially be covered by a piece approximately:

12 ft × 15 ft

That’s 180 square feet.

Now consider a:

14 × 16 ft

room.

Floor area:

224 sq ft

A 12-foot-wide roll cannot cover the 14-foot dimension with one piece.

Additional pieces may therefore be required.

This is why an advanced carpet calculator should allow the user to enter the carpet roll width.

Carpet Roll Calculator

For a fixed-width carpet roll, a useful concept is:

Roll Material Formula

The challenge is determining the required linear length.

For example, if a carpet roll is 12 feet wide and you need a 12 × 15-foot piece:

\(12\text{ ft}\times15\text{ ft}=180\text{ ft}^2\)

The roll must provide approximately 15 linear feet at a 12-foot width.

For a room wider than the roll, multiple drops or pieces may be required.

A roll-aware calculator should therefore evaluate:

• Roll width
• Room width
• Room length
• Orientation
• Number of drops
• Linear footage
• Seams
• Waste

rather than applying a single waste percentage to every room.

12-Foot Carpet Roll Calculator

A 12-foot roll is particularly important for broadloom carpet calculations.

Consider a room measuring:

12 × 15 ft

A 12-foot roll can potentially provide:

12 ft × 15 ft

That equals:

180 sq ft

Now consider:

15 × 20 ft

The floor area is:

300 sq ft

A 12-foot-wide roll cannot cover the 15-foot dimension with one uninterrupted piece.

The installer may need multiple sections.

The exact amount purchased depends on how the carpet is oriented and where seams can be placed.

Therefore, when using a 12-foot roll, don’t assume that:

Floor area + 10%

is always the most accurate answer.

Compare Carpet Orientations

For rectangular rooms, an advanced calculator can compare two possible orientations.

Orientation A

Run the carpet along the room’s length.

Orientation B

Run the carpet along the room’s width.

The better orientation may reduce:

• Number of pieces
• Linear footage
• Offcuts
• Seams

However, the mathematically smallest layout isn’t automatically the correct installation layout.

The installer may need to consider pile direction, pattern matching, seam location, doors and transitions.

Carpet Calculator for Multiple Rooms

For an entire home, don’t simply multiply the total house area by a waste percentage and assume that is the final quantity.

Instead, enter each room separately.

Example:

Room	Dimensions	Area
Bedroom 1	12 × 12 ft	144 sq ft
Bedroom 2	10 × 12 ft	120 sq ft
Bedroom 3	11 × 13 ft	143 sq ft
Living Room	15 × 20 ft	300 sq ft
Hallway	4 × 20 ft	80 sq ft
Total		787 sq ft

Total square yards:

\(787\text{ ft}^2\div9\approx87.44\text{ yd}^2\)

You can then apply a preliminary waste allowance.

At 10%:

\(787\text{ ft}^2\times1.10=865.7\text{ ft}^2\)

But the final broadloom requirement can differ because each room has different dimensions.

A better calculator should therefore provide a “Add Room” function and calculate each room independently.

Can Offcuts From One Room Be Used in Another?

Sometimes.

A piece left over from one room may be large enough to cover part of another room, hallway or closet.

This can reduce waste in a multi-room installation.

However, whether an offcut is usable depends on:

• Its dimensions
• Carpet pile direction
• Pattern
• Room orientation
• Seam requirements
• Condition of the piece

Therefore, don’t assume that every offcut can automatically be reused.

A professional installer can determine whether the pieces can be incorporated into the overall cutting plan.

How to Calculate Carpet for an L-Shaped Room

Irregular rooms should usually be divided into simpler sections.

Suppose an L-shaped room can be divided into:

Section A

12 × 10 ft

120 sq ft

Section B

6 × 8 ft

48 sq ft

Total:

\(120\text{ ft}^2+48\text{ ft}^2=168\text{ ft}^2\)

The floor area is therefore:

168 sq ft

or:

18.67 sq yd

But once again, the carpet purchase quantity may be higher.

The installer needs to determine whether:

• One piece can cover both sections
• Two pieces are needed
• A seam is required
• An offcut can be used
• The pile direction must remain consistent

For irregular rooms, the area calculation is only the first stage.

Carpet Calculator for Hallways

For a rectangular hallway:

Hallway Area Formula

For example:

\(20\text{ ft}\times4\text{ ft}=80\text{ ft}^2\)

Convert to square yards:

\(80\text{ ft}^2\div9\approx8.89\text{ yd}^2\)

A narrow hallway may be particularly useful when planning carpet offcuts from another room.

However, pile direction and seam placement still need to be considered.

Carpet Calculator for Stairs

Stairs require a separate calculation because they contain both horizontal and vertical surfaces.

Important measurements include:

• Number of stairs
• Tread depth
• Riser height
• Stair width
• Nosing
• Landings
• Runner width, if applicable

For a basic conceptual calculation, the carpeted length associated with one stair can be approximated from:

Tread depth + Riser height

For example:

Tread = 10 inches

Riser = 7 inches

Combined:

17 inches per step

For 12 steps:

\(17\text{ in}\times12=204\text{ in}\)

Convert to feet:

\(204\text{ in}\div12=17\text{ ft}\)

The stair width must then be considered to determine the carpet area.

This is only a simplified estimate. Actual stair installations can require additional material for the chosen installation method, nosing, landings and cutting.

Carpet Padding Calculator

Carpet padding is an important part of a carpet installation.

For preliminary planning:

\(\text{Padding Area}\approx\text{Carpeted Floor Area}\)

For example:

600 sq ft of carpeted floor

→ approximately 600 sq ft of padding.

But padding is also supplied in rolls and may have its own cutting requirements.

When calculating project cost, keep padding separate from carpet:

Total Material Cost

Carpet Cost + Padding Cost

Then add installation and other services if applicable.

Carpet Cost Calculator

The simplest carpet cost formula is:

Carpet Cost Formula

If carpet costs $4 per square foot and you need 600 square feet:

\(600\text{ ft}^2\times\$4/\text{ft}^2=\$2{,}400\)

If carpet costs $36 per square yard and you need 70 square yards:

\(70\text{ yd}^2\times\$36/\text{yd}^2=\$2{,}520\)

Always check the pricing unit before calculating.

Carpet Installation Cost

The total project cost may include more than the carpet itself.

Possible charges include:

• Carpet material
• Carpet padding
• Installation
• Old carpet removal
• Disposal
• Stair installation
• Furniture moving
• Subfloor preparation
• Additional seam work
• Transition materials

Therefore:

Total Project Cost

Carpet + Padding + Installation + Removal + Other Charges

An online calculator can provide a useful budget estimate, but installation prices vary by location, contractor, project complexity, carpet type and existing floor conditions.

For an actual purchase, use a local quote for the final figure.

Carpet Price Per Square Foot vs. Square Yard

The conversion is simple.

Convert Price per Square Yard to Square Foot

\(P_{\text{ft}^2}=\frac{P_{\text{yd}^2}}{9}\)

Example:

$45 per square yard:

\(\frac{\$45}{\text{yd}^2}\div9=\frac{\$5}{\text{ft}^2}\)

Convert Price per Square Foot to Square Yard

\(P_{\text{yd}^2}=P_{\text{ft}^2}\times9\)

Example:

$5.50 per square foot:

\(\frac{\$5.50}{\text{ft}^2}\times9=\frac{\$49.50}{\text{yd}^2}\)

This allows you to compare quotes using different pricing units.

Does Carpet Pattern Affect How Much Carpet You Need?

Yes.

Patterned carpet can require additional material because neighboring pieces may need to be aligned so that the design continues across seams.

This is known as pattern matching.

For example, if a carpet has a repeating geometric design, the installer may have to shift one piece relative to another to make the pattern line up.

That can increase the amount of carpet needed.

The larger the pattern repeat, the more important this consideration becomes.

If you are buying patterned carpet, ask the supplier or installer whether a pattern allowance is needed.

Does Carpet Pile Direction Matter?

Yes.

Carpet has a pile or nap direction.

Two pieces of carpet may look different if their pile directions are reversed, even if the pieces are otherwise identical.

Light can reflect differently from the carpet surface depending on the direction of the pile.

For this reason, carpet pieces are normally planned so that the pile direction remains consistent.

This means a mathematically efficient layout isn’t necessarily a suitable installation layout.

A good calculator can estimate material requirements, but the final layout should be checked by the installer.

Carpet Seam Calculation

A seam is where two carpet pieces meet.

Multiple pieces may be necessary when:

• A room is wider than the carpet roll
• The room has an irregular shape
• Several rooms are being carpeted
• The carpet must be cut in a particular direction
• Pattern matching is required

The number and placement of seams affect both material requirements and installation complexity.

A calculator can estimate when multiple drops may be necessary, but seam placement is ultimately an installation decision.

How to Measure a Room for Carpet

Accurate measurements are the foundation of an accurate estimate.

For each room, measure:

1. Length
2. Width
3. Closets
4. Alcoves
5. Recesses
6. Doorways
7. Irregular sections
8. Hallways
9. Stair dimensions
10. Landings

For an irregular room, make a simple sketch.

Write each measurement directly on the sketch.

Then divide the room into rectangles.

Example

If a room consists of two rectangular sections:

Section A = 120 sq ft

Section B = 48 sq ft

Total:

168 sq ft

This method makes complex floor plans much easier to calculate.

Measure Twice Before Ordering

A one-foot measurement error can significantly change the final quantity.

For example:

A 12 × 15 room:

180 sq ft

But if the actual width is 16 feet:

\(12\text{ ft}\times16\text{ ft}=192\text{ ft}^2\)

That’s a difference of:

12 sq ft

For a whole house, small errors across several rooms can add up.

Measure carefully and record whether dimensions are in:

• Feet
• Inches
• Meters
• Centimeters

Carpet Measurement Checklist

Before ordering carpet, check:

• [ ] Every room has been measured
• [ ] Length and width have been recorded
• [ ] Closets have been included
• [ ] Hallways have been included
• [ ] Irregular areas have been divided into sections
• [ ] Stairs have been measured separately
• [ ] Landings have been included
• [ ] Carpet roll width has been confirmed
• [ ] Pattern repeat has been checked
• [ ] Pile direction has been considered
• [ ] Seam locations have been discussed
• [ ] Waste allowance has been considered
• [ ] Carpet price unit has been confirmed
• [ ] Padding has been included in the budget
• [ ] Installation charges have been checked

Common Carpet Calculation Mistakes

1. Using only square footage

Square footage tells you the floor area, not necessarily the final purchasing quantity.

2. Automatically adding 10%

Ten percent is a useful planning allowance but isn’t universally correct.

3. Ignoring carpet roll width

Roll width can significantly affect the cutting plan.

4. Forgetting closets

If a closet will be carpeted, include it.

5. Ignoring stairs

Stairs require their own calculation.

6. Forgetting pattern repeat

Patterned carpet may require additional material.

7. Ignoring pile direction

Carpet cannot always be rotated simply to save material.

8. Combining all rooms into one area

Different rooms can produce very different cutting requirements.

9. Confusing square feet and square yards

One square yard equals nine square feet.

10. Ordering before confirming the installation plan

For an expensive or complicated installation, have the final quantity checked by your installer or supplier.

Carpet Calculator Examples

10 × 10 Room

100 sq ft

11.11 sq yd

With 10% planning allowance:

110 sq ft

10 × 12 Room

120 sq ft

13.33 sq yd

With 10%:

132 sq ft

12 × 12 Room

144 sq ft

16 sq yd

With 10%:

158.4 sq ft

12 × 15 Room

180 sq ft

20 sq yd

With 10%:

198 sq ft

But a 12-foot roll may allow a particularly efficient physical layout depending on the installation.

14 × 16 Room

224 sq ft

24.89 sq yd

A 12-foot-wide roll cannot cover the entire 14-foot dimension with a single piece, so roll layout becomes important.

15 × 20 Room

300 sq ft

33.33 sq yd

A 12-foot roll will generally require the room to be planned using multiple pieces because one roll width cannot cover the 15- or 20-foot dimension as a single uninterrupted width.

20 × 20 Room

400 sq ft

44.44 sq yd

The floor area is straightforward, but a roll-width and seam-aware calculation is preferable for determining the purchase quantity.

What Is a Good Carpet Waste Percentage?

There is no single percentage that works for every project.

As a rough planning guide:

Installation	Possible Planning Allowance
Simple rectangular room	5–10%
Several rooms	Around 10% or more
Irregular rooms	10–15%+
Patterned carpet	May require additional material
Complex seam layout	Project-specific
Stairs	Calculate separately

These numbers are planning estimates, not guarantees.

The final quantity should be based on the actual carpet layout whenever possible.

Should You Buy Extra Carpet?

Buying a reasonable amount of extra material can be useful.

Leftover carpet can potentially be stored for future repairs.

For example, if part of the carpet is damaged several years later, having a matching piece can make a repair much easier.

However, buying excessive material can unnecessarily increase your project cost.

The goal should be:

Enough material for a reliable installation—not simply the largest possible waste allowance.

When Is a Professional Measurement Worth It?

A calculator is excellent for preliminary planning.

It can help you:

• Estimate a renovation budget
• Compare carpet prices
• Understand square yards
• Estimate material quantities
• Compare different carpet products
• Plan a simple room

Professional measurement becomes especially valuable when:

• The house has many rooms
• Rooms are irregular
• There are stairs
• Carpet has a large pattern
• There are many seams
• The carpet is expensive
• The installation has unusual transitions
• You are ordering a large quantity

The installer can create a physical cutting plan and account for details that a general calculator cannot fully determine.

Quick Carpet Calculation Formulas

Rectangular floor area

\(\text{Area}=\text{Length}\times\text{Width}\)

Square feet to square yards

\(\text{Square Yards}=\frac{\text{Square Feet}}{9}\)

Square yards to square feet

Square Feet = Square Yards × 9

Waste-adjusted area

Adjusted Area = Floor Area × (1 + Waste % ÷ 100)

Carpet cost

Carpet Cost = Carpet Quantity × Price

Square-yard price to square-foot price

$/sq ft = $/sq yd ÷ 9

Square-foot price to square-yard price

$/sq yd = $/sq ft × 9

Roll material

\(\text{Material Area}=\text{Roll Width}\times\text{Linear Length}\)

For complex installations, the required linear length must be determined from the actual room layout.

Carpet Buying Tips

Before placing an order, confirm the following with the carpet supplier:

Carpet roll width

Ask what widths are available for the specific carpet.

Pattern repeat

If the carpet is patterned, find out whether additional material is required for matching.

Pile direction

Confirm the manufacturer’s or installer’s requirements.

Padding

Check the recommended pad type and thickness.

Installation

Ask whether installation is priced separately.

Removal

If replacing old carpet, ask whether removal and disposal are included.

Seams

For large rooms, ask where seams will be placed.

Final measurement

For an expensive installation, have the final quantity verified before ordering.

Frequently Asked Questions

How do I calculate how much carpet I need?

Multiply the length of the room by its width to get square feet. Divide square feet by 9 to convert to square yards. Then account for roll width, waste, seams, pattern and installation layout.

How many square feet are in one square yard of carpet?

There are 9 square feet in one square yard.

How do I convert square feet to carpet yards?

Divide the square-foot measurement by 9.

For example, 360 square feet equals:

\(360\text{ ft}^2\div9=40\text{ yd}^2\)

How much carpet do I need for a 10 × 12 room?

A 10 × 12 room has 120 square feet, or 13.33 square yards, of floor area. The actual purchase quantity depends on roll width and installation layout.

How much carpet do I need for a 12 × 12 room?

A 12 × 12 room contains 144 square feet, or exactly 16 square yards of floor area.

How much carpet do I need for a 12 × 15 room?

A 12 × 15 room contains 180 square feet, or 20 square yards. Depending on the carpet roll width and layout, the physical quantity purchased may differ from the floor area.

How much extra carpet should I buy?

A simple rectangular installation may use a planning allowance around 5–10%, while complicated layouts can require more. The actual requirement depends on roll width, room geometry, seams, pattern and pile direction.

Is 10% carpet waste enough?

It can be a reasonable preliminary allowance for some simple installations, but it isn’t a universal rule. A roll-layout calculation can provide a more useful estimate.

What is the standard carpet roll width?

Broadloom carpet is commonly available around 12 feet wide, although other widths are available depending on the carpet product.

Why does carpet roll width matter?

Because carpet comes in fixed-width rolls. If a room is wider than the roll, multiple pieces may be necessary, affecting seams and the amount of material consumed.

How do I calculate carpet from a 12-foot roll?

Compare the room dimensions with the 12-foot roll width, determine how many drops are required, and calculate the corresponding linear footage. The best orientation may depend on the room dimensions, seams, pile direction and pattern.

Can I calculate carpet for an L-shaped room?

Yes. Divide the room into rectangles, calculate each rectangle’s area and add the results. Then account for the physical cutting layout.

How do I calculate carpet for multiple rooms?

Calculate each room separately and add the areas. For a more accurate purchasing estimate, evaluate the roll layout of each room and determine whether usable offcuts can be incorporated elsewhere.

Does carpet pattern affect the amount I need?

Yes. Patterned carpet may require additional material for pattern matching between pieces.

Does carpet pile direction matter?

Yes. Carpet is normally installed with the pile direction considered consistently. Rotating pieces simply to reduce waste may create a visible difference.

How do I calculate carpet cost?

Multiply the carpet quantity by its price.

\(\text{Carpet Cost}=\text{Quantity}\times\text{Price}\)

Make sure the price is stated per square foot or square yard.

How do I convert carpet price per square yard to square feet?

Divide the square-yard price by 9.

For example:

\(\frac{\$36}{\text{yd}^2}\div9=\frac{\$4}{\text{ft}^2}\)

How do I convert carpet price per square foot to square yards?

Multiply the square-foot price by 9.

For example:

\(\frac{\$4}{\text{ft}^2}\times9=\frac{\$36}{\text{yd}^2}\)

Do I need carpet padding?

Carpet padding is normally recommended for many carpet installations, but the appropriate product and thickness depend on the carpet and installation requirements. Follow the carpet manufacturer’s recommendations.

How much padding do I need?

For a preliminary estimate, padding area is often close to the carpeted floor area. Actual purchasing quantity depends on padding roll dimensions and the installation layout.

How do I calculate carpet for stairs?

Measure the number of stairs, tread depth, riser height and stair width. Include landings and any additional requirements for the selected installation method.

Can I use leftover carpet from another room?

Sometimes. An offcut can potentially be used elsewhere if its dimensions, pile direction, pattern and condition make it suitable.

Should I order carpet based only on square footage?

For a quick budget estimate, square footage is a good starting point. For an actual purchase, especially for a large or complicated project, consider roll width, seams, pattern, pile direction and the installer’s cutting plan.

Is a carpet calculator accurate?

A calculator can provide an excellent preliminary estimate, but it cannot always replace an on-site professional measurement. The more complicated the installation, the more important the physical layout becomes.

Can I use a carpet calculator for an entire house?

Yes. Add each room separately, including closets and hallways. For the most accurate material estimate, evaluate how carpet pieces can be cut from the available roll widths.

Final Takeaway

The basic carpet calculation is simple:

\(\text{Length}\times\text{Width}=\text{Square Feet}\)

Then:

\(\frac{\text{Square Feet}}{9}=\text{Square Yards}\)

For a preliminary estimate, you can add a waste allowance:

\(\text{Adjusted Area}=\text{Floor Area}\left(1+\frac{\text{Waste \%}}{100}\right)\)

But this is only the beginning.

Broadloom carpet is a physical material supplied in fixed-width rolls. The actual amount you need to purchase can be affected by roll width, room orientation, seams, pattern matching, pile direction, irregular shapes, hallways and stairs.