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Calculating area accurately before any home project prevents the frustration of running out of material mid-job. Here is the guide for all common home situations.
The Formula
Rectangle: A=lw | Circle: A=πr² | Triangle: A=½bh
Standard formula used by professionals worldwide
Worked Example
Step-by-step
Room 6m×4m = 24m² | Add 10% for waste → buy material for 26.4m²
Key Concepts
- Accuracy: Results are as accurate as the inputs you provide
- Units: Always use consistent units throughout your calculation
- Verification: Double-check important calculations before making decisions
- Professional advice: For major financial, health, or structural decisions, consult a qualified professional
Privacy and Security
- All calculations run entirely in your browser
- No data is sent to any server
- No sign-up or personal information required
- Your data stays private — always
Frequently Asked Questions
How much extra to buy?
10% for rectangular rooms. 15% for diagonal cuts or complex shapes.
Irregular room area?
Divide into rectangles and triangles. Calculate each and sum.
How many tiles?
Room area ÷ tile area + 10% for cuts. Round up to nearest full box.