About CalcWall

CalcWall helps homeowners, DIYers and contractors work out quantities and costs before they buy materials.

Every calculator is free, works on any phone or computer, and runs entirely in your browser: nothing you type is sent to us.

What makes our calculators different

• More than one number. You get the amount, the bags or pieces to buy, waste allowance and an optional cost estimate.
• Formulas in the open. Each page shows exactly how the result is worked out, with a worked example.
• US units first, with metric available wherever it helps.

Read how we build and check our calculators, or get in touch with a correction or an idea for a new tool.