Window Cost Calculator
Work out what your windows cost — from the count, the size and your prices — with the total area, material cost, install cost and total.
Windows are priced per unit, but compared per square metre — and the install is a separate line. This calculator keeps all three visible, from your own prices.
All prices are entered by you. This site publishes no construction prices, and results are estimates, not guaranteed quotes.
Your results
Enter your measurements and press Calculate.
Quantities are rounded up to whole tiles, planks, boxes or bags, after the wastage allowance. Cost appears only when you enter a price.
Formula
All lengths are converted to a single unit before the calculation: 1 ft = 0.3048 m, 1 in = 25.4 mm, 1 ft² = 0.09290304 m², 1 yd² = 9 ft². Material quantities are rounded up — you cannot buy part of a tile, plank or bag.
How to use this calculator
- Enter the number of windows and their size.
- Enter your price and install cost per window.
- Read the total area, the material cost, the install cost and the total.
Worked example
| Windows | 4 windows, 1.2 m × 1.5 m each |
|---|---|
| Area per window | 1.2 × 1.5 = 1.8 m² |
| Total area | 1.8 × 4 = 7.2 m² |
| Material cost | 4 × $350 = $1,400 |
| Install cost | 4 × $80 = $320 |
| Total | $1,400 + $320 = $1,720 |
Check it by hand: every step above uses the formula in the box. If your numbers match the example inputs but the calculator gives a different answer, please report it via the contact page.
Frequently asked questions
What does a window cost?
It depends on the size, material and glazing — get quotes from suppliers and enter them here. This calculator does the arithmetic; it does not supply prices.
Does the price include installation?
Only if you enter it. The material cost and the install cost are separate here, so you can see each — enter 0 for install if you fit them yourself.
How do I measure a window?
Measure the opening the window fills: width × height. This calculator gives you the area per window and the total for all of them.
Is this a quote?
No. It is an estimate from your own prices — not a guaranteed quote. Get written quotes from suppliers and installers for the real price.
Related calculators
Estimates only. Results are for planning. Measure twice, confirm box coverage and tile sizes on the packaging you buy, and follow the manufacturer's instructions. See the disclaimer.