Shed door planning math
Shed Door Calculator
Plan a single or double shed door with rough opening size, panel sheets, trim boards, braces, hinges, screws, and a rough material cost.
How to use the shed door calculator
- Choose a single door or double doors.
- Enter the finished width and height you want for each door leaf.
- Adjust clearances, hinges, trim, and material prices for your hardware.
- Use the rough opening and shopping-list estimates as a first-pass plan before cutting.
The calculator adds the finished door span, opening clearances, panel area, trim and brace lengths, hinges, framing boards, and material costs for a simple site-built shed door.
Shed door sizing example
For a storage shed that needs mower access, two 30 in wide by 72 in tall door leaves create a 60 in finished span. With about 1 inch of total opening clearance, the rough opening is roughly 61 in wide by 73 in tall before final trimming and weatherstripping.
FAQ
How wide should a shed door be for a riding mower?
Many riding mowers fit through a 48 to 60 inch opening, but measure the mower deck, chute, mirrors, and attachments. A 60 to 72 inch double door gives more comfortable clearance for turning and loading.
Should shed doors swing in or out?
Most shed doors swing out so they do not take up storage space inside the shed. Use exterior-rated hinges, a good latch, and enough clearance so the door does not drag on gravel, grass, or a ramp.
How much gap should be between double shed doors?
A small center gap of about 1/4 inch to 1/2 inch is common for simple double shed doors. Add an astragal strip, weather seal, or overlapping trim if you need better rain and wind protection.
Is a plywood shed door strong enough?
Exterior plywood or T1-11 can work well when sealed and supported with perimeter trim, diagonal bracing, and sturdy hinges. Large or heavy doors may need thicker material and a stronger frame.