Three edge cases people search first
Lighting, storage and pet access come up more than the rest of this category combined — start here if you're not sure which of the nine tools fits your project.
Stair Lighting / LED Calculator
LED strip length and driver sizing for under-nosing stair lighting.
Under-Stair Storage Calculator
Usable cubic footage in the void beneath a staircase.
Pet Stair / Ramp Calculator
Rise and run sized for small-pet stairs or ramps to furniture or vehicles.
Browse by situation
Grouped into two practical sets — access and fit-checks for people, pets and furniture, and comfort or storage accessories.
Access, Lifts & Fit-Checks 6
Stair Lift Track Length Calculator
Rail length needed to cover a given stair run.
Moving Furniture Through a Stairwell Calculator
Checks if a given item will clear your stairwell turn and headroom.
Stair Opening / Floor Cutout Calculator
Rough floor opening length needed, driven by required headroom clearance.
Temporary Construction Stair Calculator
Quick layout for job-site temporary stair access.
Pet Stair / Ramp Calculator
Rise and run sized for small-pet stairs or ramps to furniture or vehicles.
Child Safety Gate Fit Calculator
Checks opening width against standard and extra-wide gate sizes.
Lighting, Comfort & Storage 3
Stair Lighting / LED Calculator
LED strip length and driver sizing for under-nosing stair lighting.
Stair Runner Padding Calculator
Padding yardage to go under a stair runner.
Under-Stair Storage Calculator
Usable cubic footage in the void beneath a staircase.
Common questions about specialty stair projects
Is there a separate calculator for anti-slip strips?
Which calculator tells me if my sofa will actually make the turn?
What's the difference between Stair Opening and Stair Headroom?
Do the pet stair and child safety gate tools use residential code minimums?
Browse the other 9 categories
From here, the natural next stops are stair configuration, structural sizing, material take-offs, railing, code checks and cost.