Stair calculator
Split a total rise into equal risers and check them against common NCC limits for houses.
Your measurements
How it's worked out
Risers = total rise ÷ preferred riser, rounded, then adjusted to stay between 115 and 190 mm. Checks: going 240–355 mm and 2R + G between 550 and 700 mm (NCC guidance for Class 1 and 10 buildings).
Estimates only. Check sizes, coverage and quantities with your supplier, engineer or certifier before ordering. Standards references are a guide, not compliance advice.
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