Paint Usage Calculator

Room length Meter(m)

Room width Meter(m)

Room height Meter(m)

Door count

Area per door m²

Window count

Area per window m²

Include ceiling Include ceiling

Coats

Topcoat coverage m²/L

Waste %

Use primer

Primer coverage m²/L

Bucket size L

Primer bucket size (L) L

Paint price ¥/L

Net paint area: -

Topcoat required: -

Primer required: -

Topcoat buckets -

Primer buckets -

Buckets needed: -

Estimated cost: -

Tips: -

Estimate topcoat/primer liters, buckets and cost from room size, openings, coats and coverage.

Typical coverage ~8.6–12 m²/L; two topcoats are common. Primer helps on new or patched walls. Runs locally in your browser.