How to use this calculator
- Enter Windows.
- Enter Type.
- Press Calculate. The highlighted row is your order quantity; the note beneath it translates the number into real-world terms.
Formula & constants
2026 installed per window: vinyl double-hung $400–$800, energy-rated $600–$1,100, wood-clad $800–$1,600, bay/bow $1,500–$4,000. Full-frame replacement adds 20–40% over insert. Every default in the fields above is editable — when your supplier’s spec sheet lists a different density, coverage rate or price, enter that number instead. The waste and compaction allowances follow common trade practice; see our methodology page for the derivation of each formula and the standards it references.
Where this fits in the project
Coating and finish quantities are coverage-rate problems: true surface area divided by the product’s rated coverage, plus a waste allowance. Prep drives success — a coating over unprofiled or damp concrete fails regardless of quantity accuracy.
How this connects to your project
No quantity stands alone — each material in the chain depends on the ones around it. These are the planning steps that pair with the window cost calculator:
- Siding Calculator — Window replacement often accompanies siding projects.
- Door Cost Calculator — Windows and doors are replaced together.
- Insulation Calculator — Energy-efficient windows improve home insulation.
- HVAC Size Calculator — Better windows reduce HVAC load requirements.
- BTU Calculator — Window quality affects heating and cooling BTU needs.
Frequently asked questions
Insert or full-frame replacement?
Insert keeps existing frames — cheaper, less glass area. Full-frame fixes rot and air leaks; required when frames fail.
Do energy windows pay back?
U-0.30 or better saves 7–15% on heating/cooling — payback 8–15 years, faster in extreme climates and with credits.
Last verified: — prices reflect current national averages. See our methodology.
Estimates are for planning. Material densities, coverage rates and prices vary by region and supplier — confirm final quantities before ordering, and check local code where structural or electrical work is involved.