All Square Footage Calculators
Sixteen focused tools, all sharing the same measurement engine. Every one is free, needs no sign-up, and runs entirely in your browser.
Start here
The main sqft calculator handles rectangles, circles, triangles, trapezoids, L-shapes and borders, sums multiple rooms, converts units and estimates cost — most people need nothing else.
Open the sqft calculator →Shapes & rooms
Measure any space, whatever shape it is.
Room Sqft Calculator Measure a single room or add every room to get a whole-house total. Circle Sqft Calculator Square footage of a circle or round area from its diameter or radius. Triangle Sqft Calculator Square footage of a triangle from base and height, or three sides. Inches to Sqft Calculator Convert measurements in inches, or feet and inches, into square feet.
Unit conversions
Move between square feet and every other area unit.
Sqft to Sqm Calculator Convert between square feet and square meters instantly, both ways. Sqft to Acres Calculator Convert square feet to acres, hectares, cents and gunthas — and back. Sqft to Square Yards Calculator Convert square feet to square yards for carpet, concrete and soil. Sqft to Linear Feet Calculator Convert square feet to linear feet for flooring, trim, lumber and fabric. Sqft to Cubic Feet Calculator Turn square feet into cubic feet or cubic yards using a depth.
Home projects
Work out materials before you order them.
Flooring Sqft Calculator Flooring, tile and carpet square footage with waste factor and box count. Wall & Paint Sqft Calculator Wall square footage minus doors and windows, plus gallons of paint. Roof Sqft Calculator Roof area from footprint and pitch, converted into roofing squares. Concrete Sqft Calculator Slab, patio and driveway area with concrete volume in cubic yards. Lawn & Yard Sqft Calculator Lawn, yard and pool square footage for sod, seed, mulch and covers.
Cost & sizing
Turn square footage into money and equipment size.
Quick answers
| I need to… | Use this |
|---|---|
| Measure a room for flooring | Room sqft calculator |
| Convert my measurements from inches | Inches to sqft |
| Work out cost per square foot | Price per sqft |
| Find the area of a round patio | Circle sqft |
| Convert a lot size to acres | Sqft to acres |
| Convert to square meters | Sqft to sqm |
| Buy flooring by the linear foot | Sqft to linear feet |
| Order concrete for a slab | Concrete calculator |
| Work out how much paint to buy | Wall & paint |
| Size an air conditioner | Sqft to tons & BTU |
| Estimate shingles for a roof | Roof sqft |
| Order sod for a lawn | Lawn & yard |
Prefer to read first?
The guides section covers how square footage is measured, where conventions differ, and how to turn a measurement into a materials order.