Free tools
Stair runner calculators
Seven free calculators covering runner length, cost, width, rods, carpet yardage, multi-flight landings and stair stringers. Every tool works instantly in your browser — no account required, and results can be copied, printed or saved to a project if you have a free Stair Runner Calculator account.
Stair runner length calculator
The main calculator: treads, risers, nosing wrap, landings, winders, pattern repeat and waste margin, with a live staircase diagram.
Stair runner cost calculator
Price the job end to end — runner per metre or foot, underlay, fitting labour, rods and delivery, with a clear itemised total.
Stair runner width calculator
Find the right runner width and the reveal of bare tread each side, based on your staircase width and preferred look.
Stair rods calculator
Work out how many rods and brackets you need, the correct rod length for your stairs, and what the set will cost.
Carpet for stairs calculator
Convert your staircase into linear metres and square yards of broadloom carpet, including cutting waste.
Stair runner length calculator
Tread depth, riser height and step count converted into a runner length in metres, feet and inches, with waste included.
Landings & flights calculator
Multi-flight staircases with half landings and quarter landings, added up flight by flight into one purchase length.
Stair calculator
Rise, run, riser count, tread going, pitch and the diagonal cut line for a whole flight, with a live section diagram and IRC or UK code checks.
Deck stair calculator
Exterior deck steps: equal risers from the ground pad to the deck boards, stringer cut line and the framing deductions that keep the bottom step right.
Stair tread calculator
How many treads you need, the going, the nosing overhang and the board depth to buy, with total run and pitch alongside.
Stair stringer calculator
Building the staircase itself? Equal riser heights, tread run, notch layout, throat depth, how many stringers you need and the board length to buy.
Stair rise and run calculator
Equal risers and a matching going from one floor-to-floor measurement, with the 2R+G comfort check and code limits either side of the Atlantic.
Stair riser calculator
Riser height and step count from total rise, including the maximum riser your code allows and how the rounding affects the last step.
Stair angle calculator
Pitch in degrees from rise and run, the diagonal stringer cut line, and where a flight crosses from comfortable into steep.
Concrete stair calculator
Poured steps: equal risers, formwork diagonal, concrete volume and the finish allowance on treads and risers.
Baluster spacing calculator
Spacing that passes the 4in sphere rule, balusters per tread, and the pitch line and rail heights they hang from.
Stair layout calculator
Full layout from total rise: risers, going, run, pitch and a live section diagram, plus headroom, floor-opening and landing checks.
Stair pitch calculator
The angle of a flight from rise and going, checked against the UK 42-degree limit and the IRC, with total run and the 2R+G comfort rule.
Spindle spacing calculator
How many spindles between the newels, the gap between each one, and whether it passes the 100mm and 4in sphere rules.
Spiral staircase calculator
Riser count, degrees per tread, walk-line tread width, diameter and headroom for a spiral or helical flight.
Learn before you buy
New to runners? Start with the complete stair runner guide, then measure up properly before ordering.