Square Footage Calculator
Result
Square Footage Calculator — free online calculator.
Formula
- Square footage calculator. This page states the geometric relationship used by the calculator and provides a worked example.
- The main inputs are Shape, Length / Base, Width, Height (triangle/trapezoid), Radius (circle), Base 1 (trapezoid), Base 2 (trapezoid). Enter them in the units and format shown in the calculator.
- Keep measurements and project assumptions consistent before comparing or combining values.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Square Footage
- Shape: rectangle
- Length / Base: 5 m
- Width: 4 m
- Height (triangle/trapezoid): 3 m
- Radius (circle): 3 m
- Base 1 (trapezoid): 4 m
- Base 2 (trapezoid): 6 m
A 12 ft by 10 ft rectangle has 120 ft².
Sample result: Calculating…
Frequently asked questions
What does the Square Footage calculate?
Use dimensions in feet for a result directly in square feet.
Which values should I enter?
Enter Shape, Length / Base, Width, Height (triangle/trapezoid), Radius (circle), Base 1 (trapezoid), Base 2 (trapezoid) using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: Rectangle=L×W; circle=πr²; triangle=base×height/2; trapezoid=(base1+base2)×height/2; ft²=m²×10.7639104167097.
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.