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📐 Square Footage Calculator

Calculate area for any shape. Add multiple rooms and get a running total in sq ft, sq m, or sq yd.

Calculate Area

Shape

Room / Area Name (optional)

Length (ft)

Width (ft)

Total Length A (ft)

Total Width B (ft)

Cutout Length C (ft)

Cutout Width D (ft)

Area = (A × B) − (C × D)

Diameter (ft)

Base (ft)

Height (ft)

This Area

Square Feet

—

sq ft

Square Meters

—

m²

Square Yards

—

sq yd

Square Inches

—

sq in

Project Total

Total Area 0 sq ft

How to Use This Calculator

Select your shape, enter dimensions, and hit Calculate for instant results in square feet, meters, and yards. Use the "+ Add to Total" button to build up a multi-room running total — useful for flooring, painting, or any whole-home project.

Area Formulas by Shape

Rectangle: Area = Length × Width
L-Shape: Area = (A × B) − (C × D)
Circle: Area = π × (Diameter ÷ 2)²
Triangle: Area = (Base × Height) ÷ 2

Converting Between Units

1 square foot = 0.0929 square meters. 1 square yard = 9 square feet. 1 square meter = 10.764 square feet. The calculator shows all conversions instantly so you don't need to do the math manually.

Common Uses for Square Footage

Square footage calculations are needed for flooring (tile, hardwood, carpet), painting walls and ceilings, buying mulch or sod for landscaping, estimating concrete for a patio, and calculating home HVAC load. Each project may have different coverage rates — use our other calculators for material-specific estimates.

Frequently Asked Questions

How do I calculate the square footage of an L-shaped room?

Divide the L-shape into two rectangles, calculate each separately, and add them together. Or measure the full bounding rectangle and subtract the corner cutout. Our L-shape option does this automatically — just enter the overall dimensions and the cutout dimensions.

How many square feet is a 12×12 room?

A 12-foot by 12-foot room is 144 square feet. Most standard bedrooms range from 100 to 200 square feet. A "12×12" is often used as a benchmark for a medium-sized bedroom.

How do I convert square feet to square meters?

Multiply square feet by 0.0929 to get square meters. Example: 500 sq ft × 0.0929 = 46.45 m². Our calculator shows this conversion automatically alongside the square footage result.

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