Shower Square Footage Calculator: Rectangular & Corner Neo-Angle

A neo-angle shower fits into a corner with an angled front panel that cuts off a triangular section of what would otherwise be a full square footprint, so subtracting that cut-off triangle from the full bounding square gives the actual usable floor area.

This is a general geometric approximation — actual usable floor area can vary slightly by specific unit design and corner cut angle, so check your specific unit’s spec sheet for an exact figure if precision matters for your project.

This calculator measures the interior floor footprint of the shower enclosure; the base and curb dimensions are typically already reflected in the length, width, or bounding square measurements you use as inputs.

A curbless shower has no raised threshold and is typically rectangular or square in its floor plan, so it generally uses the same length-times-width formula as a standard rectangular shower, though drainage slope design is a separate consideration.

Yes — shower pans and bases are sold in standard sizes that should match your calculated floor area and shape as closely as possible; check manufacturer size options against your calculated dimensions.

Measure the finished interior dimensions (after any wall backing or waterproofing membrane, if already installed) for the most accurate floor area, since tile and membrane thickness can slightly reduce interior dimensions from rough framing measurements.

Yes — accessible or ADA-compliant showers often have specific minimum floor area and turning-radius requirements, so check relevant accessibility guidelines separately if you’re designing for accessibility beyond a general floor area calculation.