How to use the concrete stairs calculator
This calculator helps you calculate the concrete volume of a solid stepped stair block. It is intended for quantity takeoffs, early budgets and checks against a measured schedule. Start with the dimensions or quantities for one clearly defined item of work. Enter values in the units shown beside each field; millimetres and metres are not interchangeable.
Assumes solid fill under every step to a level base. This is not a suspended stair waist-slab calculation. Landings, foundations and wastage are excluded.
Worked example
Ten steps at 170 mm rise, 280 mm tread and 1 m width use 2.618 m³ in a solid stepped block.
Before you order
Compare the result with your drawings and supplier information. Keep the original net quantity separate from allowances, and round purchasing quantities only at the ordering stage. Check whether delivery, labour and related materials belong elsewhere in your estimate. If the drawing or specification changes, update the inputs and record the revised basis instead of reusing an earlier total.
For the concepts behind this calculation, read Takeoff (Quantity Takeoff), Formwork, Concrete Grade.