Feet, Inch Calculator: Sawline

The construction calculator that shows its working.

Sawline is a feet-inch-fraction construction calculator for framers, carpenters and the trades. It holds feet, inches and fractions exactly, as rationals rather than decimals, so the numbers close instead of drifting a sixteenth at a time. Set the display resolution anywhere from 1/2 to 1/64.

Enter a run and a pitch and it returns the rafter, the rise and the diagonal. Enter a total rise and it returns the risers, the treads, the stringer and the angle. Hold any key to see what it does, with the formula and a worked example. Open any result to see the math with your own numbers substituted in.

For framers and roofers
Pitch as ratio, angle, percent or slope. Enter any two of rise, run, diagonal and pitch, and the other two solve. The HIP/V key gives the length of a hip or valley where both roofs share the pitch, with its plan run, its angle and the backing bevel.

For stair builders and remodellers
Enter the total rise and the STAIR key gives the risers, the riser height, the treads, the tread depth, the total run, the stringer length and its angle, one press at a time. Add the run you have and the flight is solved to fit it. When it cannot fit, the app says so and names the change that makes it fit. A code report against IRC 2021 or IRC 2024 checks riser height, tread depth and how much each varies, showing actual against required with the section number on every line.

Built for the jobsite
Works completely offline, with no account. Keeps the screen awake while you work, and the keys are sized for gloves.

How the trial works
Each calculator (area, roof and stairs) starts with a short walkthrough you can do for free. When a calculator's walkthrough ends, that calculator locks. Keep using all three with a yearly or monthly subscription, each starting with a free trial, or with a one-time lifetime purchase. No account, no ads, either way.

Please note
Sawline validates geometry against the ruleset you select. It is not a code review and it does not replace your building official.

Terms of use (EULA): https://feetinchescalculator.com/terms/
Privacy policy: https://feetinchescalculator.com/privacy/

Recent changes:
Fixed an issue where subscribers could be asked to subscribe again when their plan renewed.

Fixed an issue where buying the lifetime purchase did not remind subscribers to cancel their subscription.

Tap your plan at the top of Settings to switch to the yearly plan or the lifetime purchase.