Why is the litre count not a whole number?

It is the raw area times coats divided by coverage. Buy the next litre up so you are not short on the last wall.

Do doors and windows get painted?

Their area is subtracted from the walls. Trim litres are a separate optional line if you paint skirtings and frames.

Why does dusk change the colour so much?

The model uses warmer, weaker light. Real rooms do the same. Always check a swatch at night and by a window.

Can I upload a photo of my room?

No. Photo painters hide lighting lies and lock brands. This planner uses a scaled lounge you can orbit.

What coverage should I enter?

Use the figure on your tin. Twelve square metres per litre is a common wall starting point. Cut it for porous or dark surfaces.

Is sheen only visual?

Sheen changes how light reflects in the preview. It does not change the litre math. Coverage still comes from the tin.

Room Paint Planner

A litre formula will not show a warm beige going muddy at dusk. Click a wall, set sheen, and switch day, dusk, and lamp in a 3D lounge.

Litres use net wall area after doors and windows. Round up, keep a sample pot, and put a real swatch on the wall before you commit.

Colour, sheen, and light

Click a wall, the ceiling, or the trim, then change its colour. Switch day, dusk, and lamp to see how the same paint shifts. Litres come from net wall area after doors and windows.

Room width (m)Room length (m)Ceiling height (m)DoorsWindowsCoatsCoverage (m² / L)SheenPaint the ceilingInclude trimHighlight the selected surface

Colour for Back wall

Net wall area48.0 m²

Wall paint8.01 L

Ceiling3.99 L

Trim0.29 L

Total12.29 L

Suggested buy13 L

Coverage varies with sheen, porosity, and colour change. Round up to the next litre and keep a sample pot. Dusk and lamp views are lighting studies, not a substitute for a real swatch on the wall.

About Room Paint Planner

What this tool does

The Room Paint Planner paints a 3D lounge by surface. Click a wall, the ceiling, or the trim, assign a colour, and set sheen from flat to semi-gloss.

Day, dusk, and lamp lighting change how the same colour reads. Litres use net wall area after doors and windows, plus optional ceiling and trim.

Brand photo painters lock you to their tin. Litre boxes ignore light. This tool does both jobs in the same room people already use for TV and furniture planning.

Round up to the next litre and put a real swatch on the wall. Coverage varies with porosity and colour change.

How to use it

1Set room width, length, and ceiling height.
2Enter door and window counts so openings are subtracted.
3Choose coats and a coverage rate from the tin (often about 12 m² per litre).
4Click a wall, then pick its colour. Repeat for other surfaces.
5Set sheen and toggle ceiling or trim.
6Switch Day, Dusk, and Lamp to see the colour shift.
7Read litres by surface and buy the next whole litre.

Practical tips

Test dusk before you commit to a warm beige. Many colours go muddy when the sun drops.
Flat hides patches. Semi-gloss shows every bump. Eggshell is the usual wall compromise.
Dark colours often need an extra coat. Raise coats rather than trusting the first pass.
Keep a labelled sample pot. Touch-ups from a new batch rarely match.

Frequently asked questions

Why is the litre count not a whole number?: It is the raw area times coats divided by coverage. Buy the next litre up so you are not short on the last wall.
Do doors and windows get painted?: Their area is subtracted from the walls. Trim litres are a separate optional line if you paint skirtings and frames.
Why does dusk change the colour so much?: The model uses warmer, weaker light. Real rooms do the same. Always check a swatch at night and by a window.
Can I upload a photo of my room?: No. Photo painters hide lighting lies and lock brands. This planner uses a scaled lounge you can orbit.
What coverage should I enter?: Use the figure on your tin. Twelve square metres per litre is a common wall starting point. Cut it for porous or dark surfaces.
Is sheen only visual?: Sheen changes how light reflects in the preview. It does not change the litre math. Coverage still comes from the tin.

What this tool does

The Room Paint Planner paints a 3D lounge by surface. Click a wall, the ceiling, or the trim, assign a colour, and set sheen from flat to semi-gloss.

Day, dusk, and lamp lighting change how the same colour reads. Litres use net wall area after doors and windows, plus optional ceiling and trim.

Brand photo painters lock you to their tin. Litre boxes ignore light. This tool does both jobs in the same room people already use for TV and furniture planning.

Round up to the next litre and put a real swatch on the wall. Coverage varies with porosity and colour change.

How to use it

1Set room width, length, and ceiling height.
2Enter door and window counts so openings are subtracted.
3Choose coats and a coverage rate from the tin (often about 12 m² per litre).
4Click a wall, then pick its colour. Repeat for other surfaces.
5Set sheen and toggle ceiling or trim.
6Switch Day, Dusk, and Lamp to see the colour shift.
7Read litres by surface and buy the next whole litre.

Practical tips

Test dusk before you commit to a warm beige. Many colours go muddy when the sun drops.
Flat hides patches. Semi-gloss shows every bump. Eggshell is the usual wall compromise.
Dark colours often need an extra coat. Raise coats rather than trusting the first pass.
Keep a labelled sample pot. Touch-ups from a new batch rarely match.

Frequently asked questions

Why is the litre count not a whole number?: It is the raw area times coats divided by coverage. Buy the next litre up so you are not short on the last wall.
Do doors and windows get painted?: Their area is subtracted from the walls. Trim litres are a separate optional line if you paint skirtings and frames.
Why does dusk change the colour so much?: The model uses warmer, weaker light. Real rooms do the same. Always check a swatch at night and by a window.
Can I upload a photo of my room?: No. Photo painters hide lighting lies and lock brands. This planner uses a scaled lounge you can orbit.
What coverage should I enter?: Use the figure on your tin. Twelve square metres per litre is a common wall starting point. Cut it for porous or dark surfaces.
Is sheen only visual?: Sheen changes how light reflects in the preview. It does not change the litre math. Coverage still comes from the tin.

Room Paint Planner

About Room Paint Planner

What this tool does

How to use it

Practical tips

Frequently asked questions

More reading

Room Paint Planner

About Room Paint Planner

What this tool does

How to use it

Practical tips

Frequently asked questions

More reading