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Paint calculator

How much paint should I buy for these walls?

Before you startMeasure every wall, total the door and window area, and read coverage from the exact paint can.
Step 1

Add your measurements

Get the paint amount after subtracting openings and allowing for coats and waste.

Example numbers are loaded

Replace each example with what you measured. The example result on the right updates as you type.

Measure the wallsAdd all wall lengths together, then measure wall height.
Read the paint labelUse the planned coats and the coverage printed for this product.

Measurements stay in this browser and are never sent to analytics.

Example resultLooks good on paper

Plan for about 6.6 liters

Round up to available container sizes and keep product batches consistent.

Change the sample measurements to turn this into your estimate.
Net wall area
30.0 m2
Coated area
60.0 m2
Estimated paint
6.6 L
Paint planning diagramA proportional schematic based on the entered values. It is not a construction drawing.
Proportional planning schematic - verify all dimensions on site.

Before you buy or start work

  • Use the coverage printed for the exact paint.
  • Estimate primer separately.
  • Keep a labeled amount for later touch-ups.
Method

What this result assumes

Coverage must be taken from the selected paint product.

The estimate excludes primer unless entered as another coat with its own coverage.

Limitations

What it cannot confirm

Texture, porosity, color change, application method, and product formulation affect coverage.

This is a planning estimate, not a building-code, safety, installation, or delivery guarantee.

Confirm product-specific requirements with the manufacturer, installer, retailer, or qualified trade.

Formula 1.0.0Reviewed 2026-07-13General planning assumptions
Read category methodology