Work out material wastage allowance instantly with clear inputs, formula shown and shareable results.
Wastage is applied as a percentage uplift on measured quantity, and the allowance depends on the material: two percent for ready mix concrete, five for bricks, ten for tiles with a pattern and more for anything cut from sheets. Costing the wastage separately makes the case for better setting out visible.
Order quantity
Gross = net quantity x (1 + wastage percentage)
Wastage cost
Cost = (gross - net) x unit rate
Gross = net quantity x (1 + wastage percentage). Wastage is applied as a percentage uplift on measured quantity, and the allowance depends on the material: two percent for ready mix concrete, five for bricks, ten for tiles with a pattern and more for anything cut from sheets.
No. Wastage includes cutting offcuts, over-ordering, damage, theft and material left in mixers. Breakage is only one contributor, usually the smallest.
This calculator takes 3 inputs: Net quantity required, Wastage allowance, Cost per unit. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.