Show the formula and working
This painting time calculator estimates how many hours and working days it takes to paint a room, for DIY decorators and homeowners in the UK and Europe planning a weekend or booking time off. It adds preparation, the time spent rolling each coat and the wait for paint to dry, then spreads the total over the hours you work each day.
Quick answer: total time equals prep hours, plus area times coats divided by your painting speed, plus the wait between coats. The painting time calculator shows that a 4 m by 3.5 m bedroom with ceiling (46.9 m²), two coats at 10 m² an hour, takes about 15.4 hours, or 2.2 days at 7 hours a day.
What Is a Painting Time Calculator?
A painting time calculator is a tool that estimates how long a decorating job will take from the area, the number of coats, your painting speed, preparation time and drying time between coats.
The formula has three parts. Painting hours equal area times coats, divided by how many square metres you paint per hour. Waiting hours equal the number of coats minus one, times the recoat time on the tin. Total time is prep plus painting plus waiting. Divide the total by your working hours per day to get days.
The tool also shows hands-on time, which is prep plus painting without the waits. That is the figure to use if you plan to fill the drying gaps with other jobs, such as glossing a door in another room.
How Do You Use the Painting Time Calculator?
- Enter the area to paint in square metres (or square feet). Use our paint calculator first if you need the wall area of a room.
- Choose 1, 2 or 3 coats. Two coats is normal for a colour change or fresh emulsion.
- Set your painting speed in m² per hour. The painting time calculator starts at 10 as an editable example.
- Add prep time for filling, sanding, washing and masking. The default is 3 hours.
- Enter the wait between coats from the recoat time printed on your tin.
- Set the working hours per day, then read the total hours, working days and the breakdown.
How Long Does It Take to Paint a Room?
An average UK room takes 1 to 2 days to paint, which matches the 1 to 2 days that Which? reports for a small room done by a professional decorator. DIY jobs often take longer, because preparation and cutting in are slower without practice.
Using the painting time calculator with its default settings, the walls of a 4 m by 3.5 m double bedroom take about 11.6 hours: 3 hours of prep, 6.6 hours of rolling and cutting in, and 2 hours waiting between coats. Add the ceiling and the job grows past two working days.
Woodwork is the hidden time sink. Skirting, door frames and window frames are slow to paint by brush, and solvent based gloss needs a much longer recoat time than emulsion. Treat woodwork as a separate job in the tool with its own speed.
How Long Should You Wait Between Coats of Paint?
Most water based emulsions can be recoated after 2 to 4 hours; for example, Dulux lists a recoat time of 2 to 4 hours for its Trade Vinyl Matt Light and Space. Always use the figure on your own tin.
Recoat time depends on temperature, humidity and airflow. A cold, damp room in winter can make the wait much longer, while a warm room with a window open dries faster. If the first coat still feels cool or tacky, wait longer: rolling over soft paint drags it and leaves marks.
Oil based gloss and eggshell usually need much longer, often overnight. Check the tin and enter that figure, and the painting time calculator will show the effect on your days straight away.
How Many Square Metres Can You Paint in an Hour?
There is no fixed rate: the painting time calculator uses 10 m² an hour per coat as an editable example for rolling clear, flat walls. The best figure is your own, so time yourself on the first wall and adjust the speed.
Speed falls when there is a lot of cutting in: narrow walls, many sockets, radiators, coving and dark colours that show every gap. It rises with a 9 inch or 12 inch roller, an extension pole and a tray or scuttle that holds plenty of paint. The table shows how much speed matters for a 40 m² job.
| Painting speed | Total time for 40 m², 2 coats | Working days at 7 h |
|---|---|---|
| 6 m² per hour | 18.3 hours | 2.6 days |
| 8 m² per hour | 15 hours | 2.1 days |
| 10 m² per hour | 13 hours | 1.9 days |
| 12 m² per hour | 11.7 hours | 1.7 days |
| 15 m² per hour | 10.3 hours | 1.5 days |
Painting Time Calculator Results by Room Size
These figures come from the painting time calculator for walls only, 2.4 m high, less one door and one window (3.1 m²), with two coats, 10 m² an hour, 3 hours of prep and a 2 hour wait.
| Room | Wall area | Total time | Working days at 7 h |
|---|---|---|---|
| Box room, 2.4 m x 2.1 m | 18.5 m² | 8.7 hours | 1.2 days |
| Small bedroom, 3 m x 3 m | 25.7 m² | 10.1 hours | 1.4 days |
| Double bedroom, 4 m x 3.5 m | 32.9 m² | 11.6 hours | 1.7 days |
| Living room, 5 m x 4 m | 40.1 m² | 13 hours | 1.9 days |
| Large room, 6 m x 4.5 m | 47.3 m² | 14.5 hours | 2.1 days |
Worked Example: Priya Paints Her 4 m by 3.5 m Bedroom
Priya in Bristol is repainting a 4 m by 3.5 m bedroom with 2.4 m walls, one door and one window. The walls come to 32.9 m² and the ceiling adds 14 m², so she enters 46.9 m² into the painting time calculator. Her emulsion tin says recoat in 2 to 4 hours, so she plays safe with 3.
- Painting: 46.9 m² x 2 coats / 10 m² per hour = 9.38 hours
- Waiting: (2 coats minus 1) x 3 hours = 3 hours
- Total: 3 + 9.38 + 3 = 15.38 hours, shown as 15.4 hours
- Hands-on time: 12.4 hours
- Working days: 2.2 days at 7 hours a day
Priya books a long weekend. She does the prep and the ceiling on Friday evening and Saturday morning, then the walls over the rest of the weekend, using the waits to paint the skirting.
How Can You Paint a Room Faster and Safely?
The biggest time saver is working in the right order: ceiling first, then walls, then woodwork, so drips only ever land on surfaces you have not yet painted.
- Clear the room and cover the floor before you start, rather than working around furniture.
- Cut in one wall, then roll it while the edge is still wet, to avoid visible lines.
- Use a roller extension pole instead of a stepladder wherever you can.
- When you do need a ladder, follow the HSE guidance on ladders and stepladders: right type, firm footing, no overreaching.
- Keep a window open for ventilation and faster drying.
Once you know the time, the paint cost calculator prices the paint and sundries, and the ceiling paint calculator works out the litres for the ceiling.
Painting Time Calculator FAQs
Can you paint a room in one day?
A small room can be painted in one long day if prep is light and the paint recoats in 2 hours. The painting time calculator puts the walls of a 2.4 m by 2.1 m box room at about 8.7 hours with default settings.
How long does it take to paint a ceiling?
Divide the ceiling area times coats by your speed, which is usually slower overhead. A 4 m by 3.5 m ceiling is 14 m², so two coats at 8 m² an hour take about 3.5 hours plus the wait between coats.
How long does a professional decorator take to paint a room?
Which? reports about 1 to 2 days for a small room and around 2 days for a medium room, based on Trusted Trader prices. Professionals are usually faster at cutting in, so set a higher speed in the painting time calculator.
Does prep take longer than painting?
On older walls it often does. Filling cracks, sanding, washing down, masking and moving furniture can take as long as rolling the paint. Enter a realistic prep figure; the default of 3 hours suits a room in fair condition.
How long should paint dry before a second coat?
Most emulsions can be recoated in about 2 to 4 hours, but cold or damp rooms take longer. Oil based gloss often needs overnight. Always use the recoat time printed on your tin, and wait until the first coat is fully dry to the touch.
Is the painting time calculator accurate?
It is as accurate as the speed and prep figures you enter. Time yourself on the first wall, then update the speed. The painting time calculator shows each part of the total, so you can see exactly where the hours go.
Checked October 2026. Sources: Dulux Trade Vinyl Matt Light and Space product data, Which? cost guide to painters and decorators, HSE safe use of ladders and stepladders.