Built by people who cut runner for a living

Stair Runner Calculator exists for one reason: ordering runner should not be a guess. Every calculation here mirrors the way a fitter actually measures a staircase — tread by tread, riser by riser, with nosings, landings, winders and pattern repeats treated as their own line items rather than lumped into a vague allowance.

The calculator is free and always will be. Interior designers and runner sellers get extra tools on top, because quoting a client deserves more than a screenshot of a number.