★ CONSTRUCTION · STORAGE · SHED SIZES
It fits — a 10×12 ft shed needs a 14×16 ft footprint in a 30×20 ft yard. Standard shed sizes run from 4×6 ft for hand tools to 12×24 ft barn-style, each with 2 ft of clearance on every side. Enter your yard to find the largest shed that fits — and whether the one you want does. Reference table #215.
Sheds run from 4×6 ft for hand tools to 12×24 ft barn-style, and every shed needs 2 ft of clearance on each side. This calculator checks whether the shed you want fits your yard, how much space is left over, and the largest shed that fits — with the full standard shed size table.
A shed is sized by its footprint in feet, and its area in square feet is the length times the width. The door matters as much as the size: a single door of 3 or 4 ft takes hand tools and a push mower, and a double door of 5 ft or more takes a riding mower, bikes, and workshop gear. The shed also needs clearance: 2 ft on each side, so 4 ft in each dimension, for the walls, the door swing, and room to walk around the shed for maintenance. The required footprint is the shed length plus 4 ft by the shed width plus 4 ft. The shed fits when the yard length is at least the required length and the yard width is at least the required width. The usable area after clearance is the yard length minus 4 ft by the yard width minus 4 ft. The largest shed that fits is the biggest chart shed whose required footprint fits the yard. This is not a foundation, permit, or zoning chart: check your local setback rules before you build or buy, because many towns need a permit above a certain size and a setback from the property line that is bigger than the 2 ft of clearance here.
At the defaults — a 30 × 20 ft yard and a 10 × 12 ft shed — the required footprint is 10 + 4 = 14 ft by 12 + 4 = 16 ft, and 30 ≥ 14 and 20 ≥ 16, so it FITS. The leftover space is 30 − 14 = 16 ft of length and 20 − 16 = 4 ft of width. The usable area after clearance is 30 − 4 = 26 ft by 20 − 4 = 16 ft. The largest shed that fits is 12 × 16 ft (192 sq ft), because a 12 × 20 ft shed needs 16 × 24 ft and the yard is only 20 ft wide. The desired shed is 120 sq ft.
| Size | Area (sq ft) | Door | Typical use |
|---|---|---|---|
| 4 × 6 ft | 24 | 3 ft single | Hand tools. |
| 6 × 8 ft | 48 | 4 ft single | Push mower + tools. |
| 8 × 8 ft | 64 | 4 ft single | Mower + bikes. |
| 8 × 10 ft | 80 | 4 ft single | Mower, bikes, tools. |
| 8 × 12 ft | 96 | 5 ft double | Mower + bikes + tools. |
| 10 × 12 ft | 120 | 5 ft double | Workshop + storage. |
| 10 × 16 ft | 160 | 6 ft double | Large workshop. |
| 12 × 16 ft | 192 | 6 ft double | Large workshop + storage. |
| 12 × 20 ft | 240 | 6 ft double | Max standard size. |
| 12 × 24 ft | 288 | 8 ft double | Barn-style. |
Setup: yard 30 × 20 ft, desired shed 10 × 12 ft, clearance 2 ft on each side.
Line 1 — the required footprint. 10 + 4 = 14 ft long and 12 + 4 = 16 ft wide.
Line 2 — the fit. 30 ≥ 14 and 20 ≥ 16, so it FITS.
Line 3 — the leftover space. 30 − 14 = 16 ft of length and 20 − 16 = 4 ft of width.
Line 4 — the usable area. 30 − 4 = 26 ft by 20 − 4 = 16 ft.
Line 5 — the largest shed that fits. 12 × 16 ft (192 sq ft): a 12 × 20 ft shed needs 16 × 24 ft, and the yard is only 20 ft wide.
Reverse: the smallest yard for a 12 × 24 ft shed is 16 × 28 ft; for an 8 × 10 ft shed 12 × 14 ft; for a 10 × 12 ft shed 14 × 16 ft; for a 6 × 8 ft shed 10 × 12 ft. The largest shed for a 20 × 20 ft yard is 12 × 16 ft (192 sq ft); for a 15 × 15 ft yard 8 × 10 ft (80 sq ft); for a 30 × 20 ft yard 12 × 16 ft (192 sq ft); for a 40 × 30 ft yard 12 × 24 ft (288 sq ft).
Yard 20 × 20 ft, 10 × 12 shed: the required footprint is 14 × 16 ft, and 20 ≥ 14 and 20 ≥ 16, so it fits. The largest shed that fits is 12 × 16 ft (192 sq ft). A square yard takes the same largest shed as the default yard.
Yard 15 × 15 ft, 10 × 12 shed: the required footprint is 14 × 16 ft, and 15 ≥ 14 but 15 < 16, so it DOES NOT FIT — the width is 1 ft short. The largest shed that fits is 8 × 10 ft (80 sq ft), which needs 12 × 14 ft. Turn the shed round and it still does not fit: the yard is square, so there is no longer side to use.
Yard 40 × 30 ft: the required footprint is 14 × 16 ft, and 40 ≥ 14 and 30 ≥ 16, so it fits. The largest shed that fits is 12 × 24 ft (288 sq ft), which needs 16 × 28 ft. A big yard takes the biggest standard shed.
Yard 12 × 12 ft: the required footprint is 14 × 16 ft, and 12 < 14, so it DOES NOT FIT. The largest shed that fits is 8 × 8 ft (64 sq ft), which needs 12 × 12 ft — it fits exactly, with no room left over.
Yard 25 × 18 ft: the required footprint is 14 × 16 ft, and 25 ≥ 14 and 18 ≥ 16, so it fits. The largest shed that fits is 10 × 12 ft (120 sq ft): a 10 × 16 ft shed needs 14 × 20 ft, and the yard is only 18 ft wide.
Default yard, 12 × 24 shed: the required footprint is 16 × 28 ft, and 30 ≥ 16 but 20 < 28, so it DOES NOT FIT — the width is 8 ft short. The largest shed that fits is still 12 × 16 ft (192 sq ft). The biggest shed is too wide for a 20 ft yard.
Yard 12 × 12 ft, 4 × 6 shed: the required footprint is 8 × 10 ft, and 12 ≥ 8 and 12 ≥ 10, so it fits, with 4 ft of length and 2 ft of width left over. The largest shed that fits is 8 × 8 ft (64 sq ft).
Reverse — the other way round: the smallest yard for a 12 × 24 ft shed is 16 × 28 ft; for an 8 × 10 ft shed 12 × 14 ft; for a 10 × 12 ft shed 14 × 16 ft; for a 6 × 8 ft shed 10 × 12 ft. The largest shed for a 20 × 20 ft yard is 12 × 16 ft (192 sq ft); for a 15 × 15 ft yard 8 × 10 ft (80 sq ft); for a 30 × 20 ft yard 12 × 16 ft (192 sq ft); for a 40 × 30 ft yard 12 × 24 ft (288 sq ft).
The model assumes the yard length and width you enter, a clearance of 2 ft on each side, and the standard shed sizes in the table. It assumes the shed sits with its length along the yard length and its width along the yard width: turning the shed round is the same check with the two numbers swapped, and the calculator does not do it for you, so try both ways if the shed is close. It assumes the yard is a rectangle and the ground is level. It leaves out the foundation, the permit, the zoning setback, and the door swing, which needs clear space in front of the shed. With an 8 × 8 ft yard the usable area is 4 × 4 ft and no standard shed fits, because the smallest shed needs an 8 × 10 ft yard. With a 10 × 10 ft yard the largest shed that fits is 4 × 6 ft (24 sq ft). Rounding convention: all lengths are whole feet, areas are whole square feet, and all figures are computed from the numbers you enter, rounded only for display.
| Output | Formula | What it means |
|---|---|---|
| Required length | shed length + 2 ft clearance on each side | 14 ft. |
| Required width | shed width + 2 ft clearance on each side | 16 ft. |
| Fit | yard length ≥ required length and yard width ≥ required width | FITS. |
| Short on length | required length − yard length, when it does not fit | 0 ft. |
| Short on width | required width − yard width, when it does not fit | 0 ft. |
| Leftover length | yard length − required length | 16 ft. |
| Leftover width | yard width − required width | 4 ft. |
| Usable length | yard length − 4 ft of clearance | 26 ft. |
| Usable width | yard width − 4 ft of clearance | 16 ft. |
| Largest shed that fits | biggest chart shed whose required footprint fits the yard | 12×16 ft (192 sq ft). |
| Desired shed area | shed length × shed width | 120 sq ft. |
| Largest shed area | largest shed length × width | 192 sq ft. |
| Min yard for 12×24 | 12 + 4 by 24 + 4 | 16×28 ft. |
| Min yard for 8×10 | 8 + 4 by 10 + 4 | 12×14 ft. |
| Min yard for 10×12 | 10 + 4 by 12 + 4 | 14×16 ft. |
| Min yard for 6×8 | 6 + 4 by 8 + 4 | 10×12 ft. |
| Largest for 20×20 yard | biggest shed fitting a 20×20 ft yard | 12×16 ft (192 sq ft). |
| Largest for 15×15 yard | biggest shed fitting a 15×15 ft yard | 8×10 ft (80 sq ft). |
| Largest for 30×20 yard | biggest shed fitting a 30×20 ft yard | 12×16 ft (192 sq ft). |
| Largest for 40×30 yard | biggest shed fitting a 40×30 ft yard | 12×24 ft (288 sq ft). |
| Yard 8×8 usable area | yard minus 4 ft of clearance | 4×4 ft, largest none fits. |
| Yard 10×10 largest | biggest shed fitting a 10×10 ft yard | 4×6 ft (24 sq ft). |
| Yard 20×20, 10×12 | same model, 20×20 yard | Required 14×16 ft, FITS, largest 12×16 ft (192 sq ft). |
| Yard 15×15, 10×12 | same model, 15×15 yard | Required 14×16 ft, DOES NOT FIT, largest 8×10 ft (80 sq ft). |
| Yard 40×30 | same model, 40×30 yard | Required 14×16 ft, FITS, largest 12×24 ft (288 sq ft). |
| Yard 12×12 | same model, 12×12 yard | Required 14×16 ft, DOES NOT FIT, largest 8×8 ft (64 sq ft). |
| Yard 25×18 | same model, 25×18 yard | Required 14×16 ft, FITS, largest 10×12 ft (120 sq ft). |
| Default yard, 12×24 | same model, 12×24 shed | Required 16×28 ft, DOES NOT FIT, largest 12×16 ft (192 sq ft). |
| Yard 12×12, 4×6 | same model, 12×12 yard, 4×6 shed | Required 8×10 ft, FITS, leftover 4 ft / 2 ft, largest 8×8 ft (64 sq ft). |
The math is exact for the numbers you enter: the required footprint is the shed plus 4 ft in each dimension, the fit is the yard against the required footprint, and the largest shed is the biggest chart shed that fits. What the model cannot do is measure your yard: check the length and the width, because a yard that is not a rectangle may have less usable space than the numbers say. It assumes 2 ft of clearance on each side and a level rectangle, and it leaves out the foundation, the permit, the zoning setback, and the door swing. It assumes the shed sits with its length along the yard length: try both ways if the shed is close. For what a shed costs, see shed cost calculator; for the garage the shed sits beside, see garage size chart.
Bright Side Kit. "Shed Size Chart: Standard Dimensions & Fit Guide 2026." https://brightoolbox.com/shed-size-chart/ Accessed October 25, 2026.A 6×8 ft shed (48 sq ft) at the smallest, or 8×10 ft (80 sq ft) for comfort. A 6×8 ft shed fits a push mower and tools with a 4 ft single door, and it needs a 10×12 ft yard with 2 ft of clearance on each side. An 8×10 ft shed holds the mower, bikes and tools, and it needs a 12×14 ft yard. Measure the mower first: a riding mower needs an 8 ft wide door and a bigger shed.
2 ft on each side, so 4 ft in each dimension. A 10×12 ft shed needs a 14×16 ft footprint: 10 + 4 by 12 + 4. The clearance is for the walls, the door swing, and room to walk around the shed for maintenance. The usable area after clearance is the yard minus 4 ft each way: a 30×20 ft yard leaves 26×16 ft of usable space.
The biggest chart shed whose required footprint fits. In a 30×20 ft yard the largest is 12×16 ft (192 sq ft), because a 12×20 ft shed needs 16×24 ft and the yard is only 20 ft wide. In a 20×20 ft yard the largest is also 12×16 ft. In a 15×15 ft yard it is 8×10 ft (80 sq ft), and in a 40×30 ft yard it is 12×24 ft (288 sq ft).
16×28 ft at the smallest. A 12×24 ft shed needs 2 ft of clearance on each side, so the yard must be at least 12 + 4 = 16 ft long and 24 + 4 = 28 ft wide. A 10×12 ft shed needs 14×16 ft, an 8×10 ft shed needs 12×14 ft, and a 6×8 ft shed needs 10×12 ft. That is the smallest yard that fits the shed at all, with no room left over.
It is 1 ft short on the width. A 10×12 ft shed needs a 14×16 ft footprint, and a 15×15 ft yard is 16 ft wide on one side and 15 ft on the other — the width is 1 ft short. The largest shed that fits a 15×15 ft yard is 8×10 ft (80 sq ft), which needs 12×14 ft. Turn the shed round and it still does not fit: the yard is square, so there is no longer side to use.
No — it is a size and fit chart only. It does not cover foundations, permits, or zoning: check your local setback rules before you build or buy, because many towns need a permit above a certain size and a setback from the property line that is bigger than the 2 ft of clearance here. A shed also needs a level base, and a bigger shed may need a concrete pad or skids that this chart does not size.