Paint Area Calculator | Superficie.org

Calculate wall area and paint quantity

Enter your room measurements, openings, paint coverage, and coats. Results are calculated in PHP and shown above the form after submission.

Your results

Results will appear here after calculation.

Ready to calculate

Enter your room measurements and click the calculate button below.

With the default metric values, the expected net wall area is 44.40 m² and the paint estimate is approximately 9.77 litres.

Room measurements

Complete the fields, then calculate your paint requirements.

1. Measurement system

Metric Imperial

Enter every dimension and coverage value in the selected system.

2. Room dimensions

Room length (m)

Room width (m)

Wall height (m)

3. Doors

Number of doors

Door width (m)

Door height (m)

4. Windows

Number of windows

Window width (m)

Window height (m)

5. Other openings

Combined opening area (m²)

6. Paint specifications

Coverage (m² per litre)

Number of coats

Waste allowance (%)

Paint calculator example

A 5 m by 4 m room with walls 2.7 m high has a gross wall area of 48.6 m². One 0.9 m by 2 m door and two 1.2 m by 1 m windows total 4.2 m². The net paintable area is 44.4 m².

At 10 m² per litre, two coats require 8.88 litres before allowance. Adding 10% gives approximately 9.77 litres.

Tips for accurate estimates

Measure irregular walls individually.
Use the coverage rate shown on the paint container.
Rough and porous walls may need more paint.
Ceilings, trim, and primer are not included in this wall estimate.

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Frequently asked questions

Does the calculator subtract windows and doors?

Yes. Their combined area is deducted from the total area of the four walls.

Does it include the ceiling?

No. Use the Ceiling Area Calculator for the ceiling surface.

Can I use feet and gallons?

Yes. Select imperial units and enter coverage in square feet per US gallon.