About the Window Paint Calculator
Paint for window frames and sills, with an allowance for the extra area glazing bars add.
Also known as: paint for windows, window frame paint, sash window painting.
How to use this calculator
- Enter number of windows, window height, window width, panes per window and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
frame area = perimeter × frame width, doubled for both sides
Worked example
Using the values pre-filled in the calculator above:
- Number of windows = 4
- Window height = 1.2 m
- Window width = 1 m
- Panes per window = 2
- Coats = 2
- Coverage per litre = 14 m²
the calculator returns:
- Paint required: 0.942 litres
- Total area: 6.592 m²
- Area per window: 1.648 m²
- 750 ml tins: 2