Painting & Decorating Calculator for Painters & Contractors
Painting & Decorating Calculator
Estimate paint quantities, labour time, material costs and a suggested customer price for painting and decorating work.
Units & Currency
Choose the measurement system and currency you normally work with.
Room Dimensions
Enter the dimensions of the room or area you are decorating.
Doors & Windows
Add openings if you want their area deducted from the wall area. Leave quantities at 0 if you do not need this.
Wall Paint
Enter the number of wall coats, the manufacturer's stated paint coverage and your approximate paint cost.
Ceiling Paint
Leave this section at 0 if the ceiling is not part of the job.
Primer / Mist Coat
Useful for new plaster, bare surfaces or jobs where a separate primer coat is required. Leave everything at 0 if not required.
Additional Painting Area
Optional area for woodwork, doors, panelling, feature areas or other surfaces not included in the main wall and ceiling calculation.
Paint Wastage & Other Materials
Add an allowance for paint lost through rollers, brushes, trays, textured surfaces and general wastage, plus any other job materials.
Labour & Time
Complete this section if you want the calculator to estimate labour time and labour cost as part of the job price.
Markup & VAT / Sales Tax
Optional pricing fields for tradespeople and contractors preparing a customer estimate.
Painting & Decorating Estimate
Area Breakdown
Paint Quantity
Labour & Time
Cost & Price Breakdown
Useful Figures
This calculator provides an estimate based on the figures you enter. Actual paint coverage, labour time, material usage and job costs can vary depending on surface condition, preparation, paint type, application method, access and other site conditions. Always check paint manufacturer instructions and confirm your own costs before quoting a customer.
Ready to Turn Your Painting Estimate Into a Professional Quote?
You've worked out the paint, labour and estimated job price. Now turn those figures into a professional customer quote or invoice with the Handyman Hub Quote & Invoice Generator.
- Create professional customer quotes
- Create professional invoices
- Upload your own business logo
- Add customer & business details
- Itemise labour, paint & materials
- Add VAT / sales tax if required
- Add payment terms and notes
- Choose which sections appear
- Save your business details
- Print or save documents as PDF
Quote & Invoice Generator
No monthly subscription.
The Painting & Decorating Calculator remains completely free. Purchasing the Quote & Invoice Generator is optional.
From calculation to customer quote: use the free calculator to work out your job, then use the Quote & Invoice Generator when you want to present the price professionally to your customer.
Painting & Decorating Calculator for Paint, Labour and Job Pricing
The Handyman Hub Painting & Decorating Calculator helps painters, decorators, tradespeople, contractors and property maintenance businesses estimate the amount of paint required for a room, expected labour time, material costs and an approximate customer price.
It can also be used as a straightforward paint quantity calculator if you only need to know how much paint to buy. Simply leave the labour, markup, tax and pricing sections at 0 and complete only the fields that apply to your job.
Designed to be flexible: every numerical input starts at 0, so you do not have to remove pre-filled assumptions before calculating your own job.
What Does the Painting Calculator Work Out?
The calculator can estimate several useful figures from the same set of room measurements.
- Gross wall area
- Door and window area to deduct
- Net paintable wall area
- Ceiling area
- Paint required for walls
- Paint required for ceilings
- Primer or mist coat quantity
- Additional paintable areas
- Paint wastage allowance
- Estimated labour hours
- Estimated working days
- Labour and material costs
- Markup
- VAT or sales tax
- Estimated customer price
How Is Wall Area Calculated?
For a standard rectangular room, the calculator works out the total wall area using the room length, width and height.
The basic calculation is:
Wall area = 2 × (room length + room width) × room height
If you choose to deduct doors and windows, their calculated area is removed from the gross wall area to produce the net wall area that needs decorating.
How Much Paint Do I Need?
Paint quantity depends on three main figures: the area being painted, the number of coats and the coverage rate of the paint.
A typical manufacturer may state that a paint covers a certain number of square metres or square feet per litre. The calculator uses the coverage figure you enter rather than assuming that every paint performs the same.
The basic formula is:
Paint required = total painted area ÷ paint coverage
The calculator then applies any wastage allowance you enter. Wastage can help account for paint left on rollers and brushes, paint trays, cutting in, textured surfaces and general losses during application.
Worked Painting Calculator Example
Imagine a room measuring 5 metres long, 4 metres wide and 2.5 metres high.
This example does not deduct any doors or windows. If openings were entered and deduction was enabled, the required wall paint would be reduced accordingly.
How Does the Labour Time Estimate Work?
Professional painters and decorators can also use the calculator as a labour estimator.
Enter your approximate painting productivity as the amount of painted area you expect to complete per hour. The calculator applies that rate to the total application area, including multiple coats.
You can then add an additional preparation percentage for work such as filling, sanding, caulking, masking and general preparation.
Because decorating speed varies significantly between jobs, the productivity field is deliberately user-controlled rather than based on a fixed industry assumption.
How Do I Work Out What Hourly Rate to Use?
Your labour rate should cover much more than the wages you want to take home. A self-employed painter, decorator or contractor may also need to account for business expenses, non-billable time, vehicles, insurance, tools, administration and profit.
If you are unsure what hourly or day rate your business should be charging, use our free Hourly & Day Rate Calculator for Tradespeople & Contractors .
Markup Versus Profit Margin
This calculator uses markup. Markup and profit margin are not the same thing.
If a job costs you £1,000 and you add a 20% markup, the markup is £200 and the price before tax becomes £1,200.
The calculator does not label a margin calculation as markup. This helps avoid one of the most common mistakes when contractors calculate job prices.
Should I Deduct Windows and Doors?
There is no single rule that suits every painting job. On larger openings, deducting doors and windows can produce a more accurate estimate of the actual wall area.
On smaller jobs, some decorators may choose not to deduct every opening because the time spent cutting in around frames and corners can offset part of the apparent saving in paintable area.
The calculator therefore gives you the choice.
Why Paint Coverage Can Vary
The coverage shown on a paint tin or technical sheet is a useful guide, but actual coverage can vary.
- Porous or newly plastered surfaces may absorb more paint.
- Rough or textured surfaces normally require more material than smooth surfaces.
- Strong colour changes may require additional coats.
- Different application methods can change material consumption.
- Some paints naturally have higher or lower spreading rates.
For this reason, always use the manufacturer's stated coverage as your starting point and adjust the calculation based on the actual surface and job conditions.
Common Painting Estimate Mistakes
- Calculating wall area but forgetting to multiply by the number of coats.
- Assuming every type of paint has the same coverage.
- Forgetting preparation and masking time.
- Pricing only productive painting hours and ignoring setup or cleanup.
- Forgetting sundries such as filler, caulk, tape, abrasives and roller sleeves.
- Confusing markup with profit margin.
- Adding VAT or sales tax incorrectly.
- Treating a calculator result as a guaranteed final quote without checking the actual job.
Using the Calculator to Price a Customer Job
If you are a painter, decorator, handyman, contractor or property maintenance business, the calculator can be used as more than a paint quantity tool.
Add your paint costs, other materials, hourly rate, expected working speed, markup and local VAT or sales tax rate to build a more complete estimate.
For jobs that involve more than painting and decorating, you may also find the Handyman, Trade & Contractor Job Price Calculator useful for calculating an overall job price.
Painting & Decorating Calculator FAQs
How do I calculate how much paint I need for a room?
Calculate the area of the walls or ceiling, multiply that area by the number of coats, then divide by the paint's stated coverage per litre. You can also add a wastage allowance. The calculator above performs these calculations automatically.
How do I calculate the wall area of a room?
For a rectangular room, multiply the combined length and width by two, then multiply by the room height. This gives the gross wall area before deducting doors and windows.
Should I deduct windows and doors when calculating paint?
It depends on the job. Deducting large openings usually provides a more accurate paint quantity, while some decorators choose not to deduct smaller openings because cutting-in and wastage can offset part of the difference. The calculator allows either approach.
How many coats of paint should I allow for?
The correct number of coats depends on the paint, surface, existing colour and finish required. Rather than assuming a fixed number, the calculator lets you enter the number of coats appropriate for your job.
What paint coverage figure should I use?
Use the coverage figure provided by the paint manufacturer whenever possible. Actual coverage can vary depending on surface texture, porosity, colour change and application method.
Does the calculator include paint wastage?
Yes. You can enter your own wastage percentage. Leave it at 0 if you do not want to add a wastage allowance.
Can I use this calculator just to work out paint quantity?
Yes. Leave the labour rate, materials, markup and tax fields at 0 and use only the room dimensions, coats and paint coverage fields you need.
Can painters and decorators use this to price jobs?
Yes. The calculator can include estimated labour time, hourly labour cost, paint costs, sundries, markup and VAT or sales tax to produce an approximate customer price.
What is painting productivity?
Painting productivity is the approximate amount of painted area completed per hour. It allows the calculator to convert the total application area into an estimated number of working hours.
Does the calculator work in feet as well as metres?
Yes. You can select metric measurements using metres and square metres, or imperial measurements using feet and square feet.
Does the calculator work outside the UK?
Yes. The calculator supports multiple currencies and lets you enter your own VAT or sales tax rate rather than assuming a particular country's tax system.
Is the calculated painting price a guaranteed quote?
No. The result is an estimate based on the information you enter. Actual labour, preparation, material consumption, access and site conditions can affect the final job price. Always inspect the work and confirm your figures before giving a customer a final quote.