Equal Stair Riser and Tread Planner

equal stair riser and tread calculator online

Use equal stair riser and tread planner online for total rise mm, target riser mm, available run mm. Material-planning geometry only. Supplied dimensions and productivity are scenarios; no structural capacity or building-code compliance is determined.

How to use it

Enter total rise mm. Set target riser mm, available run mm. Select Calculate and check the labeled output. Copy or download the JSON result.

Options and example settings

Calculation method

risers = ceil(total_rise_mm/target_riser_mm); riser_mm = total_rise_mm/ceil(total_rise_mm/target_riser_mm); tread_mm = available_run_mm/positive(ceil(total_rise_mm/target_riser_mm)-1) (^ means exponentiation; trig functions ending in d use degrees).

Worked examples

Apply equal stair riser and tread planner to the case below, keeping the displayed units and assumptions. Material-planning geometry only. Supplied dimensions and productivity are scenarios; no structural capacity or building-code compliance is determined.

Equal Stair Riser and Tread Planner — worked case

Settings: target riser mm: 175; available run mm: 4200

Input:

2800

Calculated result for these inputs:

Output:

{
  "risers": 16,
  "riser_mm": 175,
  "tread_mm": 280
}

Choose the right tool

Start with measured net dimensions, then enter supplier coverage, spacing and waste allowances. A material estimate does not determine load capacity, safe construction details or compliance with local building requirements.

Limitations and common mistakes

• Material-planning geometry only. Supplied dimensions and productivity are scenarios; no structural capacity or building-code compliance is determined.
• Use the displayed unit in every field. Ratios and percentages are different inputs; percent fields use values such as 25 rather than 0.25.

Frequently asked questions

How can I use equal stair riser and tread calculator online?

Enter total rise mm. Set target riser mm, available run mm. Select Calculate and check the labeled output. Copy or download the JSON result.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.

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