Hasebah

Paint Calculator

Estimate paint quantity (liters + cans) and cost for your room's walls.

Practical calculatorGeneral editable assumptionsGlobal-readyInteractive chart

Last updated: 2026-06-03

This calculator uses generic assumptions. Use advanced mode to override them for a more accurate result.

Inputs

Input mode

Formula transparency

Source: default
liters = (net area × coats / coverage) × (1 + waste)

How to use it

  1. Enter wall length, height, and number of walls.
  2. Set coats and coverage; deduct doors/windows in advanced mode.
  3. Add price per liter for a cost estimate.

Example

  • A 4m × 3m × 4-wall room, 2 coats at 10 m²/L needs about 9.6 L.

What the result means

Liters needed includes your waste margin; cans round up to whole containers to buy.

Common mistakes

  • Forgetting the second coat.
  • Not deducting large doors and windows.
  • Ignoring the can's stated coverage.

Limitations

  • Rough surfaces and primers change consumption.
  • Estimate only.

Frequently asked

Default coverage?
We assume ~10 m²/L; adjust to your paint can.
How to deduct doors/windows?
Sum their areas (L×W) and subtract in advanced mode.
Does it include the ceiling?
No — add the ceiling as an extra wall with its area if needed.
How many coats?
Usually two; light over dark may need more.
Is it exact?
It's an estimate; buy a small margin for touch-ups.

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Results are estimates and not professional advice. Verify important decisions with a qualified professional.