Bathroom Dimensions: Standard Sizes, Fixtures and Clearances
Bathroom dimensions are set by the fixtures and the clearances between them, not by a rule about room size.
Free: draw, save in your browser, download a watermarked image. Paid: clean to-scale PDF and materials list.
| Bathroom | Typical dimensions | Floor area |
|---|---|---|
| Powder room (toilet + sink) | 3 × 6 ft to 4 × 7 ft | 18–28 sq ft |
| Full bath (toilet, sink, tub/shower) | 5 × 8 ft | 40 sq ft |
| Three-quarter bath (toilet, sink, shower) | 6 × 8 ft | 48 sq ft |
| Primary bathroom (double vanity, tub, shower) | 10 × 10 to 12 × 14 ft | 100–170 sq ft |
Industry typical sizes. No code sets a minimum bathroom size; the fixture clearances do.
| Fixture | Footprint | Code (IRC / UPC) | Guideline (NKBA) |
|---|---|---|---|
| Toilet | 20 × 28 in | 15 in centre to side; 21 in in front (24 in UPC) | 18 in side; 30 in front |
| Vanity | 24, 30, 36, 48 or 60 in wide × 21 in deep | 21 in in front | 30 in front |
| Tub | 60 × 30 or 60 × 32 in | 21 in in front | 30 in front |
| Shower | 30 × 30 in minimum | 24 in at the entry | 36 × 36 in |
IRC 2021 R307.1 and P2708.1; the editor shades these zones on the plan.
A primary bathroom starter with a double vanity, tub and shower. Click it to draw your own bathroom dimensions here.
About
A powder room works at 3 by 6 feet, the classic full bath is 5 by 8, and a primary bathroom with a separate shower and tub starts around 10 by 10. Below are the standard bathroom sizes, the footprint of each fixture and the code clearances, followed by a canvas where you can draw your own room at its real inside measurements and see whether the vanity, toilet and shower fit. It is a schematic 2D plan, not an AI render.
01
How to size a bathroom from the fixtures
Line the fixtures up along one wall and add their widths: a 30 inch vanity, a toilet needing 30 inches of width and a 60 inch tub come to 10 feet, which is why a full bath is drawn 5 by 8 with the tub across the end. Depth is the deepest fixture plus the clearance in front: a 21 inch deep vanity plus 21 to 30 inches of floor gives the 4 to 5 feet of width most bathrooms have.
A primary bathroom adds a second sink (allow 60 inches for a double vanity), a separate shower of at least 36 by 36 and often a freestanding tub, which is why it jumps to 100 square feet or more.
02
Standard bathroom size for a remodel
When the walls cannot move, measure the room wall to wall and type the numbers into the canvas. Then try the layouts: a 5 by 8 full bath holds a tub across the end, a 5 by 7 usually needs a shower instead, and a 6 by 8 three-quarter bath gives the shower a 36 inch footprint with a comfortable walkway. The plan shades any fixture that is too close to a wall or another fixture, so you see at once whether a 36 inch vanity or a 30 inch one is the right call.
- Checked on the plan: toilet side and front, sink and tub front, shower entry and size, door swings.
- Not checked: accessible turning circles, grab bars, window placement. Measure them on the plan.
03
Powder room and master bathroom dimensions
A powder room needs only the toilet and a small sink, so 3 by 6 feet with the door at the narrow end works if the door swings out; 4 by 7 lets the door swing in. A master bathroom is usually 10 by 10 at the small end and 12 by 14 or larger with a separate toilet room (30 by 60 inches minimum) and a walk-in closet off it.
04
Not a permit drawing
The plan is schematic: a scaled sketch for planning and for the conversation with a contractor, not a stamped construction drawing or permit document. It is not an AI tool either; every clearance is drawn from the sizes you type and the code figures above.
05
Frequently asked questions
- What is the standard bathroom size?
- A full bath is 5 by 8 feet (40 sq ft) with a toilet, sink and tub. A powder room is 3 by 6 to 4 by 7 feet, and a primary bathroom is typically 100 to 170 sq ft.
- What is the minimum size for a bathroom?
- There is no code minimum for the room itself. The fixture clearances set it: about 30 by 60 inches for a toilet room and roughly 5 by 7 feet for a full bath with a shower.
- What are typical powder room dimensions?
- 3 by 6 feet is the smallest comfortable powder room; 4 by 7 lets the door swing inward and gives 30 inches in front of the toilet.
- How big should a master bathroom be?
- At least 10 by 10 feet for a double vanity, toilet and shower; 12 by 14 feet or more if you want a separate tub and a toilet room.
- How much space do bathroom fixtures need?
- A toilet needs 15 inches from its centre to each side and 21 inches in front; sinks and tubs need 21 inches in front; a shower needs 30 by 30 inches inside and 24 inches at the entry.
Sources
Where the numbers come from
Local amendments apply; check your own jurisdiction.