What do you need to store?

Lawn & Garden

Push Mower8 sq ft each

Wheelbarrow8 sq ft each

Snow Blower10 sq ft each

2 Large Trash/Recycling Cans8 sq ft each

Vehicles

Riding Mower / Tractor35 sq ft each

Zero-Turn Mower45 sq ft each

ATV / Four Wheeler35 sq ft each

Recreation

Bicycle8 sq ft each

Kayak / Canoe15 sq ft each

Workshop

Workbench (2x6)12 sq ft each

Table Saw16 sq ft each

Other

Shelving Unit (2x4)8 sq ft each

Stack of Storage Boxes9 sq ft each

Portable Generator6 sq ft each

The Golden Rule of Shed Sizing

Ask any seasoned builder and they'll tell you the same thing: "Build it bigger than you think you need."

It is the most common regret among DIYers. You measure your current equipment, build a shed exactly that size, and two years later you buy a snowblower or a table saw. Now your shed is cluttered and unusable.

The 25% Rule: Calculate your exact required square footage, add walkway space, and then add another 25% for future expansion. It is much cheaper to add 2 feet of length during the initial build than to build a second shed later.

How We Calculate Space

This calculator doesn't just add up the physical footprint of your items. If a riding mower takes up 35 square feet, you can't just put it in a 35 square foot shed. You need room to walk around it, open the doors, and pull it out without scratching it.

Our algorithm automatically adds a 40% allowance for walkways and maneuvering. This ensures your recommended size is actually usable in the real world.

Next Steps

If you've found your size, head over to the Shed Material Calculator to see how much lumber it will take.
Trying to decide on a roof style? Check out our lean-to shed guide for a modern alternative to the classic gable.
Read our guide on how sheds impact property value to ensure your new outbuilding is an asset, not a liability.

Shed Size Planner