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Calculate how much paint you need for trim and baseboard from total linear metres. Select trim type — baseboard, door casing, or window trim — for an accurate quantity estimate.
Part of the Surfaces & Finishes calculators — see all tools in this category.
This calculator estimates trim and baseboard paint quantity by converting linear metres of trim to effective painting area, then applying the standard semi-gloss coverage rate.
Formula: Effective Area = Length × Trim Width. Paint = (Effective Area × Coats) ÷ 9 m²/L × (1 + Waste %)
Note: This calculator uses a fixed semi-gloss rate of 9 m²/L. Trim quantities are much smaller than wall areas — the results will look different from area-based calculators, which is expected.
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Total linear metres of all trim runs combined
Measure each trim run and add them together. Include baseboard, door casing, and window trim as separate entries if using different trim types.
Standard baseboard — widest trim type — effective width 90mm
1–3 coats (2 is standard for trim)
Typical waste is 10% for trim painting
Baseboard (70–90mm), 2 coats
Linear metres × trim width
Semi-gloss standard
Using 90mm effective width for Baseboard