Area 1
Length × width120 sq ft
Free measurement tool
Free Square Footage Calculator
A square footage calculator converts room or project dimensions into area measured in square feet. Add rectangles, circles, and triangles to total multiple spaces, convert units, and include extra material for waste.
Areas to measure
Add each room or shape separately. Units can differ by area.
Area 2
Length × width24 sq ft
Material allowance
Add extra material for cuts, breakage, pattern matching, or future repairs.
Plan to purchase
158.4 sq ft
14.72 m² including waste
Measurement tips
- Measure each space at its widest points and keep units consistent within that area.
- Split L-shaped rooms into rectangles, then add their areas together.
- Measure a circle from its center to the edge to get the radius.
- Use the adjusted total when buying flooring, tile, paneling, or sheet material.
How to use the square footage calculator
- 1
Add each area
Create one section for every room, wall, floor, or material shape you need to measure.
- 2
Choose a shape and unit
Select rectangle, circle, or triangle, then choose feet, inches, meters, or centimeters.
- 3
Enter the dimensions
Enter length and width, radius, or base and height. Each section is converted to square feet automatically.
- 4
Set a waste allowance
Add a percentage for cuts, breakage, pattern matching, or future repairs when estimating materials.
- 5
Review the combined total
Use the total square feet, square meters, and adjusted material area to plan your purchase.
Square footage calculator FAQ
How do you calculate square footage?
For a rectangle, multiply length by width. For a circle, multiply pi by the radius squared. For a triangle, multiply base by height and divide by two.
How do I calculate square footage for multiple rooms?
Calculate each room separately, then add the areas together. This calculator totals multiple rectangular, circular, and triangular sections automatically.
How many square feet are in a square meter?
One square meter equals about 10.764 square feet. The calculator converts metric dimensions and shows both square feet and square meters.
How much waste should I add for flooring or materials?
A 5% to 10% allowance is common for simple layouts. Complex patterns, angled cuts, or fragile materials may need 10% to 15%.
Can I mix feet, inches, and metric measurements?
Yes. Choose a unit for each section, and the calculator converts every area to a shared square-foot total.
Related woodworking and renovation tools
Turn your area measurements into practical paint, sheet-good, and layout estimates.
Free Painting Tool
Wall Paint Calculator
Estimate wall paint gallons, primer, coverage, waste, and material cost from room dimensions.
Free Renovation Tool
Drywall Calculator
Estimate drywall sheets, joint compound, tape, screws, waste, and material cost from room dimensions.
Free Woodworking Tool
Plywood Calculator
Estimate plywood sheets, square footage, waste, utilization, and material cost before buying panels.
Free Woodworking Tool
Board and Batten Calculator
Estimate batten spacing, trim length, board count, waste, and material cost.