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Paint Coverage Calculator

Estimate the liters of paint needed for any wall area and number of coats.

Renovating a roomStep 2 of 5

Best for: Planning a room repaint, an exterior job, or pricing materials before you start.

Complete guide
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How it's calculated & sources
The Paint Coverage Calculator uses the standard method for this calculation. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Paint Coverage?
A paint coverage calculator estimates how much paint you need from the area you are painting, the paint's coverage rate and the number of coats.
Why does Paint Coverage matter?
An estimate of paint volume. Buy a little extra for touch-ups and to avoid running short mid-job (and a colour mismatch from a new batch).
How is Paint Coverage calculated?
Paint needed equals total wall area times the number of coats, divided by the coverage rate. Coverage is typically about 10-12 square metres per litre (roughly 350 square feet per US gallon) per coat on a smooth, sealed surface; rough, porous or unprimed walls soak up more and cover less. Formula: Litres = (Wall area x coats) / coverage rate.
What is a good paint coverage?
Plan for about 10-12 sq m per litre per coat, usually two coats, plus primer on new or patchy surfaces.
What are common paint coverage mistakes?
Not subtracting large doors and windows from the wall area.
When should you use the Paint Coverage Calculator?
Planning a room repaint, an exterior job, or pricing materials before you start.

What is the Paint Coverage Calculator?

A paint coverage calculator estimates how much paint you need from the area you are painting, the paint's coverage rate and the number of coats.

How the Paint Coverage Calculator works

Paint needed equals total wall area times the number of coats, divided by the coverage rate. Coverage is typically about 10-12 square metres per litre (roughly 350 square feet per US gallon) per coat on a smooth, sealed surface; rough, porous or unprimed walls soak up more and cover less.

Litres = (Wall area x coats) / coverage rate

What's a typical value?

Plan for about 10-12 sq m per litre per coat, usually two coats, plus primer on new or patchy surfaces.

Paint needed by wall area (coverage ≈ 11 m² per litre per coat)

20 m²1.823.640.9607
30 m²2.735.451.44
40 m²3.647.271.92
60 m²5.4510.912.88
80 m²7.2714.553.84
100 m²9.0918.184.8

Common mistakes to avoid

  • Not subtracting large doors and windows from the wall area.
  • Forgetting that most jobs need two coats.
  • Ignoring surface texture and porosity, which cut coverage.
  • Buying the exact amount with nothing left for touch-ups.

Keywords: paint, coverage, wall, liters.

Sources: General trade guidance (paint manufacturer coverage specs)

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Paint Coverage Calculator free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Paint Coverage Calculator?+

Paint Coverage Calculator uses the standard paint coverage formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Paint Coverage Calculator runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Paint Coverage Calculator on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Title: I built/used this free paint coverage calculator — instant, no signup

Body: Estimate the liters of paint needed for any wall area and number of coats. Try it: https://freetoolsgalaxy.com/tools/paint-coverage-calculator
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Paint Coverage Calculator on Free Tools Galaxy — Estimate the liters of paint needed for any wall area and number of coats. https://freetoolsgalaxy.com/tools/paint-coverage-calculator
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# Paint Coverage Calculator — the free tool I keep coming back to

Estimate the liters of paint needed for any wall area and number of coats.

Try it: https://freetoolsgalaxy.com/tools/paint-coverage-calculator
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The fastest way is to use a free in-browser paint coverage calculator: https://freetoolsgalaxy.com/tools/paint-coverage-calculator. Estimate the liters of paint needed for any wall area and number of coats.

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