This calculator subtracts a process’s new time from its old time to find the time saved, then expresses that savings as a percentage efficiency gain.
Efficiency Time Calculator
Time saved and percentage efficiency gain from a process change, given the time it took before and after.
What the Efficiency Time Calculator Covers
This calculator covers time-saved calculations and efficiency gain percentages for any process change — comparing how long a task took before an improvement versus after, whether that’s a workflow change, new equipment, process automation, or a personal habit change.
This is useful for justifying a process improvement with concrete numbers, tracking productivity gains over time, or simply quantifying how much a change actually helped.
How Efficiency Gain Is Calculated
Formula
Time Saved = Time Before − Time After
Efficiency Gain = (Time Before − Time After) ÷ Time Before × 100
Where:
- Time Before = how long the process took before the change
- Time After = how long the process takes after the change
Worked Example
A process that used to take 45 minutes now takes 30 minutes after a workflow change.
Time Saved = 45 − 30 = 15 minutes
Efficiency Gain = 15 ÷ 45 × 100 ≈ 33.3%
This change saved 15 minutes per instance, representing a 33.3% efficiency gain over the original process time.
Using This for Larger-Scale Impact
Once you know the time saved per instance, multiply that figure by how often the process repeats (daily, weekly, or over a project) to see the cumulative time savings across many repetitions, which is often more meaningful than a single-instance comparison.
Frequently Asked Questions
Can efficiency gain be negative?
Yes — if the new time is longer than the old time, this calculation will produce a negative percentage, indicating the change actually made the process slower rather than more efficient.
How do I calculate the total time saved over a year?
Multiply the per-instance time saved by the number of times the process runs in a year to get an annualized time savings figure, which is often useful for making a business case for a process change.
Is a higher efficiency gain percentage always better?
A higher percentage does represent a larger relative improvement, but consider it alongside the absolute time saved and how often the process repeats — a large percentage gain on a rarely used process may matter less than a smaller gain on a frequent one.
Can I use this for cost savings instead of time savings?
This calculator is built specifically around time values, but the same before/after percentage formula applies to any comparable metric, including cost, if you substitute cost figures for time figures.
What’s considered a significant efficiency gain?
There’s no universal threshold — what counts as significant depends on the process, how often it repeats, and the effort required to make the change, so it’s best judged against your specific context rather than a fixed percentage.
How do I compare efficiency gains across two different improvements?
Calculate the percentage efficiency gain for each improvement separately using its own before-and-after times, then compare the resulting percentages directly to see which change had the larger relative impact.