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Stair calculator
Enter the floor-to-floor rise, number of risers and tread depth to see the dimensions and a side-view drawing.
How do I calculate stair dimensions?
Enter the total rise, choose a whole number of risers and enter one tread depth. This straight-flight estimate uses one fewer tread than risers.
Frequently asked questions
How do I calculate stair dimensions?
Enter the total rise, choose a whole number of risers and enter one tread depth. This straight-flight estimate uses one fewer tread than risers.
Are my measurements uploaded?
No. This calculator runs in your browser and does not send measurements to a server.
What dimensions does this stair calculator show?
Enter the total rise, choose a whole number of risers and enter one tread depth. This straight-flight estimate uses one fewer tread than risers.
Does this calculator check local building codes?
Geometry estimate only. It does not check building codes, headroom, landings, structure or site conditions. Confirm plans with local rules and a qualified builder.