Knowledge hub

Garage door measuring and sizing tools

Use focused calculators for finished opening size, headroom, sideroom, backroom, drive-through clearance and opener space.

Garage opening planner

Convert rough measurements into a finished opening and check headroom, sideroom, backroom and estimated drive-through clearance.

Calculate the smallest finished opening after floor, plaster and insulation using measurements taken at three points.

Compare available headroom with an editable door and opener requirement and see the actual installation margin.

Check left and right sideroom separately, including track requirements and the margin left after finishes and services.

Check whether tracks, the open door and the opener fit before a beam, duct, light or the rear wall.

Find the nearest common sizes that do not exceed the finished opening and compare the remaining width and height gaps.

Estimate drive-through width and height after subtracting the frame, guides, fascia, threshold and installation position.

Check opening size, headroom, sideroom, backroom, opener space and estimated clearance for a sectional door.

Check roll box and guide space and see how behind-opening or in-opening installation affects the drive-through clearance.

Estimate drive-through clearance, frame losses, garage depth and the safe external swing zone in front of the garage.

Calculate how floor build-up and a threshold reduce opening height and the level difference created by a selected slope.

Check how insulation and plaster on both reveals change the finished width and margin around the intended door size.

Check opener rail length, rear reserve, headroom, garage depth and the distance to the power socket.