Window Replacement Cost Calculator
Total cost to replace windows, with payback from energy savings.
Enter your values
Enter the number of windows you are working with.
Choose one of: Vinyl double-hung, Vinyl casement, Fibreglass, Wood clad.
Enter the install cost per window in $.
Enter the annual energy bill in $.
Enter the expected energy saving in %.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Total project cost
- $8,500.00
- Cost per window
- $850.00
- Annual energy saving
- $288.00
- Simple payback
- 29.5 years
- 20-year savings
- -$2,740.00
Working
- 110 x ($600.00 + $250.00) = $8,500.00
Quick answer
Cost = number of windows x (unit price + installation), plus trim and disposal. Payback compares that to annual heating and cooling savings.
total = n x (unit + install); payback = total / annual savings
At a glance
| What it does | Total cost to replace windows, with payback from energy savings. |
|---|---|
| Category | Home & DIY |
| Inputs needed | Number of windows, Window type, Install cost per window, Annual energy bill, Expected energy saving |
| Main output | Total project cost |
| Formula | total = n x (unit + install); payback = total / annual savings |
| Cost | Free — no sign-up, no download |
How to use the Window Replacement Cost Calculator
- 1Count the windows and choose the frame material you are pricing.
- 2Add realistic installation - full-frame replacement costs more than insert windows.
- 3Compare payback against how long you plan to stay in the home.
Inputs explained
- Number of windows
- Enter the number of windows you are working with.
- Window type
- Choose one of: Vinyl double-hung, Vinyl casement, Fibreglass, Wood clad.
- Install cost per window($)
- Enter the install cost per window in $.
- Annual energy bill($)
- Enter the annual energy bill in $.
- Expected energy saving(%)
- Enter the expected energy saving in %.
Worked example
Using the values the calculator loads with:
Inputs
- Number of windows10
- Window typeVinyl casement
- Install cost per window250 $
- Annual energy bill2400 $
- Expected energy saving12 %
Results
- Total project cost$8,500.00
- Cost per window$850.00
- Annual energy saving$288.00
- Simple payback29.5 years
- 20-year savings-$2,740.00
- 10 x ($600.00 + $250.00) = $8,500.00
Frequently asked questions
Do new windows pay for themselves?
Rarely on energy alone - typical payback is 15 to 25 years. The real wins are comfort, noise, condensation and resale value.
Insert or full-frame replacement?
Inserts are cheaper and quicker when the existing frame is sound. Full-frame is required if there is rot or you want to change the opening size.
What do I need to enter into the Window Replacement Cost Calculator?
Just 5 values: number of windows, window type, install cost per window, annual energy bill, expected energy saving. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Window Replacement Cost Calculator work out the answer?
Cost = number of windows x (unit price + installation), plus trim and disposal. Payback compares that to annual heating and cooling savings. It applies the formula total = n x (unit + install); payback = total / annual savings and shows the working so you can check each step by hand.
Is the Window Replacement Cost Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.