Garage opening planner
Convert rough measurements into a finished opening and check headroom, sideroom, backroom and estimated drive-through clearance.
OpenOpening · clearances · drive-through
GarageDoorTo — garage opening and door sizing planner
Calculate the finished garage opening, verify headroom, sideroom, backroom and compare sectional, roller and up-and-over doors.
Measurements stay in the browser. The result is not an order size or a substitute for a product drawing and professional survey.
Quick finished-opening estimate
Most useful tools
Start with the full planner or open a calculator for one measurement.
Finished garage opening calculator
Calculate the smallest finished opening after floor, plaster and insulation using measurements taken at three points.
OpenGarage door headroom checker
Compare available headroom with an editable door and opener requirement and see the actual installation margin.
OpenGarage door sideroom checker
Check left and right sideroom separately, including track requirements and the margin left after finishes and services.
OpenGarage door backroom checker
Check whether tracks, the open door and the opener fit before a beam, duct, light or the rear wall.
OpenStandard garage door size matcher
Find the nearest common sizes that do not exceed the finished opening and compare the remaining width and height gaps.
OpenRough to finished opening
Include floor, plaster and reveal insulation before comparing door sizes.
Four installation dimensions
Opening, headroom, left/right sideroom and backroom are checked separately.
Saved options
Compare measurements before and after finishing or for different door systems.