3D Room Paint & Flooring Calculator
See your room in 3D and get exact paint and flooring amounts.
Planning to repaint a room or lay new flooring? The 3D Room Paint and Flooring Calculator turns a few simple measurements into the numbers you actually need at the store: how many liters of paint to buy and how many boxes of flooring to order. Enter your room length, width, and height in meters, add the number of doors and windows, choose how many coats you want, and set the coverage figures printed on your paint and flooring labels.
As you type, an interactive 3D preview of your room appears so you can orbit it and sanity-check the shape before you shop. The preview runs right in your browser and works on phones, with a simple flat fallback if your device cannot render 3D. The tool subtracts standard door and window openings from the wall area and applies your flooring waste percentage, so the totals reflect a real job rather than a bare rectangle.
3D preview needs WebGL. Your results below are still exact.
Paint needed
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Formula
wall area = perimeter × height − openingsHow to use the 3d room paint & flooring calculator
- Measure your room and enter the length, width, and ceiling height in meters. If your tape measure reads in feet, convert first with the unit converter.
- Enter the number of standard doors and windows so their areas are removed from the paintable walls, and tick the box if you plan to paint the ceiling too.
- Set the number of coats and the paint coverage in square meters per liter, which is usually listed on the can (many wall paints cover roughly 10 to 12 square meters per liter per coat).
- Enter the coverage of one flooring box in square meters and a waste percentage, typically 5 to 10 percent for straight layouts and more for diagonal or patterned installs.
- Read the results: paint in liters, floor area, paintable wall area, and the number of flooring boxes, then orbit the 3D model to confirm the layout looks right.
Worked example
Say your bedroom is 4 m long, 3 m wide, and 2.5 m high with one door and two windows. The wall perimeter is 14 m, so gross wall area is 14 × 2.5 = 35 square meters. Subtracting one standard door (about 1.6 square meters) and two windows (about 1.4 square meters each) leaves roughly 30.6 square meters of paintable wall. With two coats at 11 square meters per liter, that is about 5.6 square meters of coverage per liter over two coats, so you need close to 5.6 liters of paint and would buy a 6-liter can or two smaller tins. The floor area is 4 × 3 = 12 square meters. If each flooring box covers 2.2 square meters and you add 10 percent waste, you need 13.2 square meters, which rounds up to 7 boxes.
Common mistakes to avoid
- Forgetting the second coat. Most colors need two coats for even coverage, and a single-coat estimate can leave you short by nearly half.
- Ignoring the waste factor for flooring. Offcuts, trimming, and mistakes mean you should always round boxes up and keep a spare for future repairs.
- Not subtracting doors and windows, which overstates the paint you need, or subtracting far too much and running out mid-wall.
- Mixing up units. If you enter feet where the tool expects meters, every result will be wrong, so convert measurements first.
- Buying the exact calculated amount with no margin. Round paint up to whole cans so you have enough for touch-ups later.
Frequently asked questions
Does it subtract doors and windows?
Yes — the paintable wall area excludes the openings you enter, so you don't over-buy.
Will it run on my phone?
Yes. The 3D view is optional and falls back to a 2D image on low-power devices.
Should I include the ceiling area in my paint total?
Only if you plan to paint it. Tick the paint the ceiling checkbox and the tool adds the floor-sized ceiling area (length × width) to your paintable surface. If you are leaving the ceiling as is, keep the box unchecked so you are not buying extra paint you will not use.
Why does the tool round flooring up to whole boxes?
Flooring is sold in sealed boxes, so you cannot buy a partial one. After applying your waste percentage, the calculator rounds up to the next whole box to guarantee full coverage. Keeping a leftover plank or two is also wise, since matching the exact color and batch later can be difficult.
What coverage numbers should I enter if I do not have the labels handy?
As a rough guide, interior wall paint often covers about 10 to 12 square meters per liter per coat, though textured or porous surfaces absorb more. Flooring box coverage varies by product but is usually printed on the packaging. Always check your actual labels once you have them, since brands differ, and update the fields for a precise result.