塗料使用量計算機
Room length メートル(m)
Room width メートル(m)
Room height メートル(m)
Door count
Area per door m²
Window count
Area per window m²
Include ceiling
Coats
Topcoat coverage m²/L
Waste %
Use primer
Primer coverage m²/L
Bucket size L
下塗り缶サイズ（L） L
Paint price ¥/L
Net paint area: -
必要な塗料: -
Primer required: -
上塗り缶数 -
下塗り缶数 -
Buckets needed: -
Estimated cost: -
Tips: -
Paint Usage Calculator
Estimate topcoat/primer liters, buckets and cost from room size, openings, coats and coverage.
- Enter L×W×H, door/window counts and areas
- Optional ceiling, coats, coverage, waste, primer and price
- Wall area = 2(L+W)H − openings (+ceiling)
- Liters = area × coats ÷ coverage × (1+waste%)
- Buckets = ceil(liters ÷ bucket size)
Typical coverage ~8.6–12 m²/L; two topcoats are common. Primer helps on new or patched walls. Runs locally in your browser.