Free Square Footage Calculator - Measure Any Space
Calculate square footage for any room or area. Best free square footage calculator 2025 - rectangles, triangles, circles, and complex shapes.
Quick Answer
Square footage for a rectangle: Length × Width. A room 12ft × 15ft = 180 sq ft. For multiple areas, add them together. For triangles: Base × Height / 2. For circles: π × radius². Calculate any area at practicalwebtools.com.
Key Facts about Square Footage Calculator:
- Rectangle area: Length × Width
- Triangle area: Base × Height / 2
- Circle area: π × radius² (≈ 3.14159 × r²)
- 1 square foot = 144 square inches
- 1 square yard = 9 square feet
- 1 acre = 43,560 square feet
- Add 10% waste factor for materials
Why Use Our Square Footage Calculator?
Calculate any area:
Multiple Shapes
Rectangle, triangle, circle, more.
Any Units
Input in feet, inches, meters.
Combine Areas
Add multiple sections together.
Material Calculator
Estimate materials needed.
Instant Results
Get square footage immediately.
100% Private
Your measurements stay private.
How to Square Footage Calculator in 3 Easy Steps
Calculate square footage:
Choose Shape
Rectangle, triangle, circle, etc.
Enter Dimensions
Length, width, radius, etc.
Get Area
View square footage instantly.
Measure Any Space
Works for any shape
Multiple areas can be combined
Material estimation help
Perfect for home projects
Common Use Cases for Square Footage Calculator
Essential for:
Frequently Asked Questions
Everything you need to know about our square footage calculator
How do I calculate square footage?
Length × Width for rectangles. Break irregular shapes into parts.
For rectangles: multiply length × width. A 10ft × 12ft room = 120 sq ft. For irregular shapes, break into rectangles, calculate each, and add together.
How do I convert square feet to square yards?
Divide sq ft by 9. 180 sq ft = 20 sq yd.
Divide square feet by 9. A 180 sq ft room = 180/9 = 20 square yards.
How much flooring do I need?
Area + 10% waste. 200 sq ft room needs 220 sq ft material.
Calculate square footage, then add 10% for waste and cuts. A 200 sq ft room needs about 220 sq ft of flooring material.
How do I calculate wall square footage for paint?
Height × width per wall, sum all, subtract openings.
For each wall: height × width. Add all walls. Subtract window and door areas. One gallon typically covers 350-400 sq ft.
Still have questions? Try the tool yourself!
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