Stair Stringer Cut Calculator
Calculate stringer plumb cut and level cut angles from riser and going dimensions.
Estimate only — not a substitute for a licensed tradesperson, a certified engineer, or sign-off from your local building surveyor. Verify against current standards and site conditions before ordering materials or starting work.
Result
- Riser used in calculation (kept within 115-190mm)
- 178mm
- Going used in calculation (kept within 240-355mm)
- 250mm
- Stringer pitch angle
- 35.45deg
- Plumb cut angle (from vertical)
- 35.45deg
- Level cut angle (from horizontal)
- 54.55deg
- Step diagonal (per step)
- 306.89mm
NCC Housing Provisions Table 11.2.2a (verified 2026-08-20 against both the NCC 2022 and NCC 2025 editions on ncc.abcb.gov.au - identical figures in both). NCC 2022 remains the legally operative edition in most states/territories until each jurisdiction adopts NCC 2025 on its own timeline (e.g. NSW and QLD both adopt 1 May 2027) - confirm which edition currently applies where you're building, and check for any state-specific variation, before relying on this.