Wallpaper A (Waste mode)
Input net=25.0, waste=12%, salvage=0%, pack=Roll, packSize=5.3
Output Need 28.00㎡ / Order 6 rolls (31.80㎡) / Leftover 3.80㎡
Material Order Calculator with Waste and Yield
Apply waste or yield and salvage rate to net required quantity, then round up by pack unit.
Each row shows pre-round need, order count, and leftover so site decisions are faster.
Real-time calculation
Pack-unit rounding
Local browser processing
Show formulas
Waste mode and Yield mode are normalized to the same internal logic so results stay consistent.
- Waste mode: need = net × (1 + waste × (1 - salvageRate))
- Yield mode: baseWaste = (1 / yield) - 1
- Yield mode: need = net × (1 + baseWaste × (1 - salvageRate))
- Order quantity: packCount = ceil(need / packSize), orderQty = packCount × packSize, leftover = orderQty - need
About recommended waste (reference)
Recommended waste is only a practical starting point, not a fixed standard.
- Pattern matching, diagonal layout, and site constraints can increase or reduce waste.
- You can directly edit the direction factor.
- Enter net quantity and packSize in the same unit system.
How to use
- Choose input mode: Waste% or Yield%.
- For each material row, enter net quantity, waste/yield, salvage rate, and pack unit.
- Check pre-round need, order count, and leftover in the result cell.
- Share with CSV copy or CSV download if needed.
Examples
Floor Material B (Yield mode)
Input net=40, yield=90%, salvage=20%, pack=Box, packSize=12
Output Yield converted to waste internally, then rounded up to pack count with leftover shown
FAQ
What is the difference between Waste% and Yield%?
Waste% is extra allowance on top of net need. Yield% is the usable portion of procured quantity. This tool converts Yield% to waste internally so both modes remain consistent.
What happens when salvage rate is 100%?
Waste is fully offset, so the required amount approaches the net quantity.
How can I reduce leftover?
Compare different pack sizes, pack types, salvage rates, and waste/yield values.
Does this tool convert units automatically?
No. Enter net quantity and pack size in the same unit system.
Is recommended waste a fixed value?
No. It is only a reference value, and you should tune it for site conditions.