🚪 Windows & Doors

Windows & Doors calculators

Window area, sill, rough opening, glass weight and replacement, sliding/bifold door, curtain and blind sizing, plus glazing energy savings.

Curtain / Blind Size Calculator

Calculates curtain or blind dimensions by window size
Door Rough Opening Calculator

Calculates rough opening dimensions for pre-hung doors
Glass Replacement Calculator

Estimates glass replacement panel count, size and weight
Glass Weight Calculator

Calculates glass panel weight by area and thickness
Window Glazing Cost Estimator

Build a costed schedule for a set of windows
Heat Loss Through Glazing Calculator

Watts and annual kWh lost through glass
Rooflight & Skylight Daylight Area Calculator

Recommended rooflight area for good daylight
Sliding / Patio Door Calculator

Calculates sliding patio door rough opening
Trickle Vent Area Calculator

Required background ventilation area for a room
U-Value Contribution Calculator

Area-weighted U-value of glazing plus wall
Window Area Calculator

Calculates window glass area for energy or replacement planning
Window Replacement Cost Calculator

Estimates window replacement cost
Window Sill Calculator

Calculates window sill or stool material by linear feet of windows
Window-to-Wall Ratio Calculator

Work out the glazed fraction of a wall