Strong Sixteenth

Framing math, down to the sixteenth.

Pro: $5.99 (CA$8.49), pay once · Android

A feet-inch-fraction calculator for framers and carpenters. Type lengths the way you read a tape (5 ft 7 in 3/8), and see the rafter, stair stringer or rake wall drawn to scale, with pictures that show how to lay out and make each cut.

Pay once, Pro for lifeOne purchase unlocks every calculator. No subscription, nothing to renew.

No data collectedOffline. No ads, no account, no tracking. Your numbers stay on your phone.

Jobs and cut listsKeep each site's work together. Tick off every piece as you cut it; share as PDF.

Rake wall drawn to scale with every stud length

Rake wall cut list with tick boxes and Add all to job

Finished stairs from the side: risers, treads, run and diagonal

Stair stringer layout with the framing square, step by step

$Feet-inch-fraction calculator with paper tape$

Swipe for more →

Strong or shy

Rounded answers tell you which way they lean: "strong" is a hair over the fraction shown, "shy" a hair under. Same as saying "13 and a strong sixteenth" on the job.

See how to cut it

Step-by-step pictures with the saw angles and which side to keep, for crown molding (nested, flat or coped), hip and jack rafters, marking a rafter, stair stringers, baseboard corners, rake walls, collar ties and polygons. Set it up for a tilting compound saw or a miter-only saw.

35 calculators

Free, no limits	Feet-inch-fraction calculator, common rafter, layout marks, squaring check, equal spacing, rough opening, pitch converter, ramp, corner miter, right triangle, unit converter, area & volume, grade & slope
3 free uses, then Pro	Stairs, hip & valley, crown molding, stairs with landing, roofing, concrete, cut optimizer
Pro	Wall framing, rake wall, irregular hip, collar tie, stairwell opening, polygon, arch, equal courses, block & brick, gravel & fill, sheet goods, decking, flooring & tile, paint & coverage, board feet

Pro also adds History and jobs. Your purchase goes through Google Play and restores on a new phone with the same Google account.

Built for the jobsite

Big keys you can hit with gloves on
Outdoor high-contrast theme for bright sun, and a keep-screen-on option
Works in airplane mode, in a basement, anywhere
Never guesses feet or inches: a bare "8" asks which you meant

Private by design

No sign-up, no ads, no tracking. The app doesn't use the internet; the only connection is to the Google Play app on your phone for buying and restoring Pro. Your numbers stay on your phone and, if backup is on, in your own Google backup. We never receive them. Privacy policy

For instructors

Teach carpentry or construction, in a college, high school or apprenticeship program? Email support@mimssoftwareco.com from your school or college email and we'll send free Pro codes for you and your class. It works offline, has no ads and collects no data, so it's safe on student phones.

Tell us what's wrong

Found a number that's off, a screen that's confusing, or a calculator you wish it had? Email support@mimssoftwareco.com. Every message gets read, and fixes go into the next update.

Strong Sixteenth does the math. You're still the one holding the saw: check your numbers and cut a test piece before cutting good stock.