Riserly Stair Calculator

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Riserly is the fastest way to lay out a stair on the job site

Why we expect it: Clear value for carpenters, with a live stair diagram, IRC code checks and a genuinely useful free core.

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In short

Riserly Stair Calculator is a utility that lays out a stair from a single total rise entry, with a live to-scale diagram that updates as you type. It is aimed at carpenters working on job sites, and it reports risers, treads, stringer length, angle and a code check against common International Residential Code requirements. Its standout feature is the diagram, which labels each dimension directly on the drawing.

Summary by Debuts, based on the App Store listing.

About

Riserly is the fastest way to lay out a stair on the job site. Enter the total rise and everything updates instantly on a single screen, no Calculate button, no extra screens.

SEE YOUR STAIR AS YOU TYPE A live, to-scale stair diagram redraws with every change: the real number of steps, the cut stringer, tread boards with nosing, the floor and the landing. Total rise, total run, riser, tread, angle and stringer length are labeled right on the drawing.

ACCURATE, CARPENTER-FRIENDLY RESULTS - Whole number of risers, with the actual riser height recalculated so every step is equal - Bottom riser automatically reduced by the tread thickness - Total run, stringer height and stringer length - Stair angle and comfort formula (2R + T) - Below-landing or flush stringer mount - Feet, inches and sixteenths, like your tape measure, or metric

IRC CODE CHECK Green, yellow and red indicators for riser height, tread depth, comfort and angle, based on common International Residential Code requirements.

BRANDED PDF ESTIMATES (PREMIUM) Add your company name, contact details, license number and logo, and send a clean one-page estimate with the stair diagram, all dimensions, the code check, the price and signature lines. Share it by email or Messages, save to Files or print.

SAVE EVERY JOB (PREMIUM) Keep your stair projects with client name, address and notes. Reopen, duplicate or update them anytime.

FREE VS PREMIUM All calculations, the live diagram and the code check are free. Saving projects and exporting PDF estimates require Riserly Premium, available weekly, monthly or yearly, with a free trial on select plans.

Riserly provides estimates for planning purposes. Always verify dimensions and local building code requirements before cutting or building.

SUBSCRIPTION TERMS Payment is charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple Account settings.

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