Shed Size Calculator
Enter how many of each thing you want to keep in the shed. The calculator adds up the floor space, allows room to walk and get things out, and suggests a standard shed size and the door you need.
- From what you store
- Walkway included
- Standard shed sizes
Count garden tools on wall hooks as one set. Shelf units are about 3 ft wide.
Sheds fill up faster than anyone expects. Each bike takes about 9 square feet, a ride-on mower over 20. Adding 40% for a walkway, a family with three bikes, a mower and some tools needs an 8 × 6 ft shed at the least.
Shed size chart
Standard sizes. Search for a size.
| Shed (ft) | Floor (sq ft) | Floor (m²) | Suits |
|---|---|---|---|
| 6 × 4 | 24 | 2.2 | Tools and a mower |
| 6 × 6 | 36 | 3.3 | Two bikes and tools |
| 8 × 6 | 48 | 4.5 | Family bikes and a mower |
| 10 × 8 | 80 | 7.4 | Bikes, mower and a bench |
| 12 × 10 | 120 | 11.1 | Workshop and storage |
| 16 × 12 | 192 | 17.8 | Ride-on mower and a workshop |
Sizes are length by width in feet.
Bikes and shed size
Plus a mower, tools and a shelf. Slide the bikes.
The plan shows your things laid out inside the shed.
How to choose a shed size
List, add, allow. Step through it.
List items
Everything to store.
Check local rules: in many places sheds under a set height near the boundary need no permission.
Timber, metal or plastic
Shed materials. Compare them.
Classic and easy to fit out.
Secure and low upkeep.
Light and rot proof.
A solid base, such as slabs or a timber frame, keeps any shed square and dry.
Before buying
Shed checks. Tick each item.
Tick each item as you go.
Allow at least 2 ft round the shed for maintenance and to treat the walls.
What you get
Shed sizing. Each tile explains one result.
Standard.
Items only.
Total.
Same shed in m.
Width needed.
If two sizes are close, buy the larger. Extra space is always used.
Frequently Asked Questions
No question matches that search.
What size shed do I need?
Add the floor space of everything you want to store, add 40% for a walkway, and choose the next standard size.
What size shed for two bikes?
At least a 6 × 4 ft shed, or 6 × 6 ft with tools and a mower.
What size shed for a ride-on mower?
At least 8 × 8 ft, with double doors and a ramp.
Is a bigger shed better?
Usually. Most people run out of space within a year or two.
How much space does a bike take in a shed?
About 9 square feet including room to get it out.
Do I need permission for a shed?
Often not, but there are height and distance limits near boundaries. Check your local rules.
What base does a shed need?
A level, solid base such as paving slabs, concrete or a timber frame.
Room for everything
List what you store, add a walkway and pick the next standard size. Then check the door is wide enough for the biggest thing going in.
More size calculators
Each one has its own calculator, worked examples and answers to common questions.