Waste Allowance Calculator
If you know a net quantity and want to add a waste factor, this returns the gross quantity to order.
Step 1: Units
Step 2
Enter project measurements
Use decimals if needed (e.g. 3.5).
How to use this calculator
Enter net quantity (pieces, square feet, cubic yards, etc.) and waste percent.
What the math is doing
Gross = net × (1 + waste ÷ 100).
Frequently asked questions
Typical waste values?
5–15% is common for many finish materials; stone can be higher.
Compounding waste?
This applies one factor only.
Returns?
Order only what you can return if policy allows.
Cut diagrams?
Optimize cuts to lower real waste.