Measure a window the careful way.
Slide three widths and three heights, pick a size allowance and see the smallest size, the order size, whether the opening is out of square and a note for basement egress. Send it with your estimate.
- Slide the numbers
- See the order size
- Free, no signup
Measure the opening
- Out of square by0
- Glass area, about0
How this works
- Old openings are rarely square, so you measure the width at the top, middle and bottom, and the height at the left, center and right, and use the smallest of each.
- Replacement windows are made a little smaller than the opening so they fit and can be shimmed level. The size allowance depends on the window and the installation method, so treat the order size here as a starting point.
- The egress note uses the common rule of thumb for basement bedrooms. Local codes differ, so we confirm every measurement and the rules that apply before anything is ordered.
Saved. Your answers will travel with the estimate form at the bottom of the page.
Every window starts with a good measure.
Three places
Openings are rarely square, so one number is never enough.
The smallest wins
Use the smallest width and height so the unit fits.
Allowance
A small allowance lets the unit be shimmed level.
Verify before ordering
Made-to-order windows cannot be returned, so we check.
Measure Guide questions
How do I get a price?
Fill in the form on any page, or call or text 800-224-9245. Tell us roughly how many windows or doors you have, what bothers you most and any style you like, and send a photo if you can. We measure and send a written, itemized estimate.
How long does installation take?
Many homes take a day or two for a handful of windows and a few days for a whole house, plus the lead time for made-to-order units. Our Window Counter estimates the days for your house.
What is the difference between full-frame and insert replacement?
An insert slides a new window into the existing frame and keeps your trim. Full-frame removes the frame too, so rot and leaks can be repaired and new flashing and insulation installed.
Want us to measure it for you?
We measure every opening and send a written, itemized estimate.