Paint coverage per gallon and litre

Convert label coverage and understand how it changes a purchase estimate.

Editorial review: October 11, 2026 · AI-assisted initial content · Editorial transparency

Coverage is the surface area that a stated volume covers for one coat under the product’s specified conditions. Use the label or technical data sheet. Coatpath starts at 350 sq ft per US gallon, equivalent to approximately 8.59 m² per litre.

Convert the label correctly

One international foot is exactly 0.3048 metres. One US liquid gallon is exactly 3.785411784 litres. To convert sq ft/US gal to m²/L, multiply by 0.09290304 and divide by 3.785411784. A label value of 400 sq ft/US gal converts to about 9.82 m²/L.

Coverage is not a promise

Texture, porosity, application method and surface preparation can change material consumption. Do not treat a smooth-wall label estimate as measured performance on rough masonry. Enter a defensible lower coverage value for your actual product and substrate.

Less coverage means more paint

For 700 sq ft and two coats, 350 sq ft/gal requires 4 gallons before extra. At 400 sq ft/gal, it requires 3.5 gallons. A 10% allowance changes these to 4.4 and 3.85 gallons, or five and four whole gallons to buy.

Avoid double allowances

If you already reduced coverage to account for application losses, decide whether a further waste percentage is justified. Keep the settings visible so the estimate does not silently compound multiple safety factors.

A label conversion reference

Check what the label is dividing by

A 2.5 L tin covering 25 m² per coat has coverage of 10 m²/L—not 25 m²/L. For 32 m² and two coats at 10 m²/L, use 6.4 L before extra or 7.04 L with 10% extra. If coverage is only 8 m²/L, the same project needs 8.8 L including extra.

Do not enter total tin coverage as coverage per litre, or multiply coats twice. Enter your label in the paint calculator; its comparison shows the effect of 10% lower coverage without changing your measurements.

Already know your area or paint quantity? Try the two-way paint coverage calculator.

Source notes

• Sherwin-Williams paint calculator — manufacturer planning guidance; check the specific product data sheet before buying.
• Benjamin Moore paint calculator — manufacturer estimating reference.
• Resene estimating worksheet — worked area and coverage methods.

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