✦Home & DIY
How much paint do I need for a wall?
Estimate net wall area, account for coats and coverage, and distinguish the exact requirement from a practical whole-litre minimum.
Formula: (5 × 2.6 − 2) × 2 ÷ 10 = 2.2 L. The whole-litre figure is rounded up and is not the exact mathematical result.
✦Calculate it
Enter your values
(5 × 2.6 − 2) × 2 ÷ 10 = 2.2 LThe whole-litre figure is rounded up and is not the exact mathematical result.
02Understand it
Why this calculation works
litres = (wall area − openings) × coats ÷ coverage. The calculation above updates with your own values, so the answer is never a disconnected black box.
Worked example
A 5 m × 2.6 m wall with 2 m² of openings, two coats and 10 m²/L coverage needs 2.2 L.
Assumptions and edge cases
- Coverage is the manufacturer’s value you enter.
- Surface condition and waste can change real use.
03Practise it
Learn the mathematics
This tool connects to the authoritative Goofer Math skill graph. Study the concept, then practise with the same validated exercise architecture used by the full game.
04Master it
Continue in Math From Counting to Calculus
Keep your understanding moving through the connected 155-skill journey. Your progress stays intact.
Related real-life calculations
Questions people ask
Should I subtract doors and windows?
Yes, if you will not paint them.
Why multiply by coats?
Each coat covers the same net area again.