Flooring material calculator
Work out net plank count, recommended purchase quantity and waste-inclusive area from room dimensions, plank size and a waste rate, with the derivation printed line by line.
Runs in your browserEvery computation happens in your browser — your data never leaves this device.
Material result
Net planks, purchase quantity and waste-inclusive area.
Enter the room dimensions to calculate
Room area: 0 · Plank area: 0 · Net planks: 0 · Buy planks: 0 · Waste area: 0
What this tool does
- Plan before renovating: measure the room, enter the plank size and get both the net count and the purchase quantity in one go.
- Compare quotes on equal footing — some sellers price per plank, others per square metre, and this converts between them.
- Judge the waste rate: change it from 5% to 8% and see how many extra planks a diagonal or herringbone lay needs.
- Check a contractor's quote by feeding their plank count back into the formula to see whether the waste was padded.
Example
Input
4,3,1210,165
Output
房间面积：12 ㎡（4 m × 3 m） 单块规格：1210 mm × 165 mm = 0.19965 ㎡ 净需块数：61 块（⌈12 ÷ 0.19965⌉，向上取整） 推荐采购：64 块（按损耗 5% 折算后再取整） 含损耗面积：12.7876 ㎡ 推导：房间面积 12 ㎡；单块面积 = 1210/1000 × 165/1000 = 0.19965 ㎡； 净需 = ⌈12 ÷ 0.19965⌉ = 61 块；采购 = ⌈12 × (1 + 5%) ÷ 0.19965⌉ = 64 块。 剩余整板：3 块（用于补板，可留作备用）。 损耗率参考：直铺 5%，斜铺或人字拼 8%~10%，异形房间适当加大。
Plank area = length(mm)/1000 × width(mm)/1000; net count = ⌈room area ÷ plank area⌉.
Frequently asked questions
How is the net plank count computed?
Net count = ⌈room area ÷ plank area⌉, rounded up because half a plank cannot be bought. For a 12 m² room with 1210 mm × 165 mm planks: plank area = 1.21 × 0.165 = 0.19965 m², and 12 ÷ 0.19965 = 60.1, which rounds up to 61.
Why does the purchase quantity differ from the net count?
Purchase = ⌈room area × (1 + waste) ÷ plank area⌉: the waste is added to the area first and only then converted to planks, matching how orders are actually placed. In the same example at 5% waste: 12 × 1.05 ÷ 0.19965 = 63.1, rounding up to 64 — three spare planks.
What waste rate should I use?
Straight lay is usually 5%; diagonal, herringbone or chevron patterns call for 8–10%; irregular rooms, many doorways or large pattern matching need more. The default is 5% and can be set anywhere from 0 to 50%.
How do I enter the plank size?
In millimetres, for example 1210 and 165. Leaving it blank uses the default 1210 mm × 165 mm, a common 1.2 m laminate plank. Note the unit is millimetres, not centimetres — do not enter 121.
What is the waste-inclusive area?
Waste-inclusive area = net planks × plank area × (1 + waste), i.e. the covered area if you buy the net count and then account for waste. It is larger than the room area and the difference is the waste.
Can I order straight from the result?
Use it as a reference, but skirting, door frames, raised platforms, laying direction and batch colour variation all matter. Order from the result and keep one or two spare planks to avoid a colour mismatch later.
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