Define the dimensions of your straight staircase

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Diagrams

Diagram showing straight concrete staircase Diagram showing straight staircase with strings Diagram showing straight concrete staircase with overlap Diagram showing straight staircase with central string

Calculation form

Just enter the data that you know. The other dimensions will be calculated automatically.

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The height is the only mandatory information required

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Advanced parameters keyboard_arrow_down

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Height of a staircase

The vertical distance between the lower floor and the upper floor.

Number of steps in a staircase

Number of steps that make up the staircase. The upper floor counts as a step.

Going of a staircase

Horizontal distance between two step nosings.
The going must be between 230 and 330 mm (9 and 13").
Its ideal value is 280 mm (11").

Total run of a staircase

Horizontal distance between the nosing of the first step and the nosing of the upper floor step.

Headroom of a staircase

Distance between the ceiling and the walkline at the stairwell.
The headroom must be greater than 1900mm (75") and its ideal value is greater than or equal to 2100mm (83").

Stairwell of a staircase

An opening in the upper floor that accommodates the staircase.

Slab thickness of a staircase

Thickness of the slab of the stairwell.

Blondel's Law

G + 2H = 590 to 650mm
G + 2H = 23.2 to 25.6"
G: going
H: Step height
Formula created by French architect François Blondel (1618-1686) verifying coherence between the step height and the going.
The ideal value is 630mm (24.8").

Step height of a staircase

The vertical distance between two step nosings.
The height of the step must be between 150 and 200mm (6 and 8").
Its ideal value is 175mm (7").

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The results are solely indicative and are not exhaustive. Please refer to the legislation and standards applicable in your country.