Estimate paint quantity, tin sizes, likely material spend, decorator labour and a realistic total room painting budget. Add windows, doors, ceilings and woodwork for a more tailored result.
This room paint calculator works out your wall area from the room length, width and height, then deducts windows and doors before calculating how much paint you are likely to need. You can also adjust for extra coats, surface type, ceilings, skirting, architraves, internal doors and radiators.
Because real rooms do not all behave the same, this calculator uses practical planning figures rather than assuming every wall achieves the best possible coverage shown on a paint tin.
Use the simple calculator for a quick estimate, or open the advanced settings for more control over deductions, surfaces, woodwork and finish level.
This gives you a practical guide for paint quantity, tin buying, materials, labour and an overall budget range for decorating the room.
| Estimate type | What it means | Guide price |
|---|---|---|
| Materials only | Paint and sundries, with no labour included | £0 |
| Lower-end job | Straightforward repaint with lighter preparation | £0 |
| Typical room cost | Most standard rooms with branded paint and normal prep | £0 |
| Higher-end finish | Extra prep, stronger colour changes, fresh plaster or a more premium finish | £0 |
A quick visual check to help confirm your room size looks sensible.
A few notes to keep your estimate closer to real life.
These are the main reasons a room painting quote moves up or down.
Use this as a planning guide, then get in touch for a tailored decorating quote based on the room condition, finish level and any prep required.
Smooth walls usually go further than bare plaster, textured walls or older porous surfaces. That is why this calculator lets you adjust the surface type and recommends practical tin sizes rather than relying on best-case coverage figures.
You need enough paint to cover the wall area after deducting doors and windows, multiplied by the number of coats. This calculator does that automatically and also suggests a sensible tin combination.
Yes. Large openings reduce the total wall area that needs painting, which can lower the amount of paint required.
Usually yes. Fresh plaster and porous surfaces tend to absorb more paint and often need a mist coat or extra material allowance.
Many rooms need two coats for a tidy finish. Rough surfaces, colour changes or fresh plaster can sometimes require more.
If you plan to paint the full room, yes. Ceilings, skirting, architraves, doors and radiators all add extra materials and labour.
That depends on room size, paint quality, prep work and location. Small rooms can still carry a minimum booking value, while larger or prep-heavy rooms will cost more.
