Home Calculators Stair calculator Stair calculator: rise, going and Building Regs check Enter the total rise and we'll work out the risers, treads, pitch and stringer length, then check it against Part K.
Total risemm Finished floor to finished floor Total going (optional)mm Leave blank and we'll pick one
Risers 12 × 216.7 mm
Treads 11 × 241 mm
Pitch 42.0°
Total going 2,651 mm
Stringer length 3,713 mm
2R + G 674 mm Building Regs check (private stair)
Rise 216.7 mm (max 220) passes Going 241.0 mm (min 220) passes Pitch 42.0° (max 42°) passes 2 × rise + going = 674 mm (550–700) passes Shopping list
2 x C24 Graded Timber 47 x 225mm x 4.2m Two stringers with 200 mm spare for cuts. Treads, risers and handrail aren't included.
Add to materials list How it works 1 Measure finished floor to finished floor for the total rise. 2 If space is tight, enter the total going you have. 3 Green ticks pass Part K for a private stair; red means change the going or rise. 4 Add the stringers to your list and compare timber prices. Material prices for this job Now find the cheapest place to buy Take your quantities across to Price Planter and compare them across UK builders' merchants — including whether splitting the order across two merchants works out cheaper.
Compare material prices Quantities are typical trade allowances and a guide only — always confirm with your tradesperson or supplier before ordering.
All Price Planter calculators