Use this paint calculator to estimate how much paint you need for a wall or room. It is ideal for decorators, tradespeople and DIY users who want a quick and accurate paint estimate.
Paint Calculator
Paint Calculator
Results
Wall Area: 0.00 m²
Total Coverage Needed: 0.00 m²
Paint Needed: 0.00 litres
Paint Needed with Waste: 0.00 litres
How to Use This Paint Calculator
Enter the wall length and height in metres, choose the number of coats, and enter the paint coverage in square metres per litre. The calculator will estimate the amount of paint required, including waste.
How Much Paint Do I Need?
The amount of paint you need depends on:
- the size of the area
- the number of coats
- the paint coverage rate
- waste allowance
The basic formula is:
- Area = Length × Height
- Total Coverage Needed = Area × Number of Coats
- Paint Needed = Total Coverage ÷ Coverage per Litre
This paint calculator works it out instantly so you can order materials more accurately.
Example Paint Calculation
For a wall that is:
- 5 metres long
- 2.4 metres high
- 2 coats
- 10m² coverage per litre
The calculation is:
- Wall Area = 12m²
- Total Coverage Needed = 24m²
- Paint Needed = 2.40 litres
With a 10% waste allowance:
- Paint Needed with Waste = 2.64 litres
Why Use a Paint Calculator?
Using a paint calculator helps you:
- estimate paint quantities more accurately
- reduce over-ordering
- avoid running short
- plan decorating jobs more efficiently
- improve cost estimates
It is useful for walls, rooms and general interior or exterior decorating work.
Typical Paint Coverage
Paint coverage varies by product, but many paints cover around:
- 8 to 12m² per litre per coat
Always check the manufacturer’s guidance on the tin before ordering.
Who Should Use This Paint Calculator?
This paint calculator is useful for:
- decorators
- painters
- builders
- contractors
- DIY users
It gives a quick and practical estimate for common UK painting jobs.
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