Architect Tools

Architecture · Calculator

Stair Calculator

Calculate riser count, exact riser height, total run and stair angle.

Project inputs

Enter your project values, then press Calculate.

How this calculator works

Calculate riser count, exact riser height, total run and stair angle.

risers = round(total rise ÷ target riser); exact riser = rise ÷ risers

How to use the Stair Calculator

1. Enter project inputs

  • Total rise (mm)
  • Target riser (mm)
  • Tread depth (mm)
  • Landing/run adjustment (mm)

2. Review the results

  • Risers
  • Exact riser
  • Treads
  • Total run
  • Stair angle

3. Check the calculation

The calculator uses the following core relationship:

risers = round(total rise ÷ target riser); exact riser = rise ÷ risers

Estimating note: Actual material quantities can vary with site conditions, detailing, product dimensions, installation method, and waste.

Stair Calculator FAQ

What does the Stair Calculator calculate?

Calculate riser count, exact riser height, total run and stair angle.

What information do I need to use the Stair Calculator?

The calculator uses inputs such as Total rise (mm), Target riser (mm), Tread depth (mm), and Landing/run adjustment (mm). Use values from your drawings, measurements, product data, or project specifications.

How should I use the results from the Stair Calculator?

Use outputs such as Risers, Exact riser, Treads, Total run, and Stair angle for estimating and cross-checking. Before purchasing or construction, confirm the dimensions, units, waste factors, supplier packaging, and project specifications.