Part K · England · Free to use
Stair calculator: rise, going and pitch
Risers, rise, going, pitch, the 2R+G rule and headroom from your floor-to-floor height.
Approved Document K (2013, including 2020 amendments)
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Part K · Result
13 risers at 219.2 mm
Pitch 41.8°, total going 2,940 mm.
Checks passed- Number of risers: Calculated resultrise max 220 mm13
- Rise: Checks passed150 to 220 mm219.2 mm
- Going: Checks passed220 to 300 mm245 mm
- 2R + G: Checks passed550 to 700 mm683 mm
- Pitch: Checks passedmax 42°41.8°
- Headroom: Checks passedmin 2,000 mm2,000 mm
- Total going: Calculated result12 treads2,940 mm
- Guarding (Table 3.1): 900 mm on stairs and landings in a dwelling, 1,100 mm on external balconies; no 100 mm sphere gap where children under five.
- Dwelling stair width comes from AD M Vol 1, not AD K.
Clauses this relies on
Source edition and scope
Approved Document K (2013, including 2020 amendments).
This is a preliminary check of the conditions shown. Confirm the edition, project circumstances and any additional requirements with your architect or building control.
A design aid, not legal advice. Checked against the Building Regulations 2010 for England; confirm with building control.