Windows & Doors
Calculators.

Free precision tools — no signup, no ads.

5 Tools

Window Energy Calculator

Calculate annual heat loss cost through windows by U-value — compare single, double, and triple pane with ENERGY STAR compliance check

window U-valuewindow energy lossannual heat loss windows
→

Window U-Factor Calculator

Compare window U-factors to calculate annual heat loss reduction, energy savings, and payback period for window replacements

window u-factorwindow energyenergy star windows
→

Door Rough Opening Calculator

Calculate door rough opening dimensions for prehung, sliding, bifold, and pocket doors — with header sizing and framing member list

door rough openingdoor ROrough opening size
→

Door Sizing Calculator

Calculate door rough opening dimensions, header size, ADA compliance clearances, and framing materials for any door size and type

door sizingrough openingdoor rough opening
→

Weatherstripping Calculator

Calculate weatherstripping length needed, air leakage reduction, and annual energy savings for doors and windows by gap size and strip type

weatherstrippingdoor sealwindow seal
→

← All Construction & DIY Calculators