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Material Waste Calculator
Material Waste Calculator
Add a waste percentage to any material quantity so you buy enough for cuts and defects.
%
Results appear as you type.
How to use
- Enter the exact quantity from your measurements.
- Choose a waste percent (5-15% is common for DIY).
- Optionally round up to whole units or pack sizes.
Formula
withWaste = quantity × (1 + waste%/100) packs = ceil(withWaste / packSize)
Examples
Example 1
100 units + 10% waste = 110; round up stays 110.
Example 2
100 + 10% = 110 with pack size 25 → 5 packs (125 units).
Assumptions
- Waste is applied as a simple percentage uplift.
- Does not model pattern matching or directional materials.
FAQ
When should I ceil the order?
Choose ceil when you cannot buy a fraction of a pack. That matches how most stores sell boxes and bundles.
Is 10% waste always enough?
It is a common starting point. Tile diagonals, patterned flooring, and odd cuts often need more.
What does pack size do?
It rounds the wasted quantity up to whole packs so your order matches how the product is sold.
Can I use this for paint?
Paint has its own calculator with coverage and coats. Use this tool for generic quantities with a waste percent.