SEE THE CUT
BEFORE YOU START THE SAW.
Stop guessing with abstract numbers. The first visual construction calculator that proves your geometry works and verifies code compliance before you waste a single board.
Built for the Job Site. Not the Office.
Sunlight Mode
High-contrast display designed for job site visibility. Read every number in direct sunlight without squinting.
Glove-Friendly UI
All buttons sized 48px+ for easy tapping with work gloves on. No more removing gloves to use your calculator.
Offline Reliability
Zero internet required. Works in basements, remote sites, and steel-framed buildings with no signal.
Stay Code Compliant. Avoid Failed Inspections.
Calc1Cut validates every calculation against US and German building codes in real-time, warning you before you make the cut.
US Production
- IRC 2021 Compliance - Automatic validation for residential stairs
- Max Rise: 7¾ inches (196.9mm) per step
- Min Tread: 10 inches (254mm) depth
- Visual Warnings: Red highlights when limits exceeded
Working in Germany? See DACH Compliance Standards →
See It Before You Cut It
Our core calculators give you an interactive preview of the final piece.
Stair Stringer Calculator
Nail your stringers every time. Dial in your total rise and our app automatically adjusts the bottom step for a perfect fit, warning you if you exceed code limits.
Rafter Calculator
From simple roofs to complex geometries. Get precise lengths, plumb cuts, and seat cut angles, including specific visuals for birdsmouth cuts.
You Buy Your Hammer Once.
Why Rent Your Calculator?
We reject the "Software as a Service" model for core utility tools. When you buy Calc1Cut, you own that version for life. No monthly drains on your wallet.
(Regular $39)
What Pros Are Saying
"The visual rafter tool would have saved me hours and a costly mistake on a complex roof."
- John S., Carpenter for 15 years
"Finally, a calculator that makes sense! The interactive views are a game-changer."
- Sarah L., General Contractor
"Offline capability is huge for me. I work in a lot of remote areas and this app just works."
- Mike R., Deck Builder
Ready to Build Smarter?
Join the waitlist to get your free Stair Stringer Guide and early bird pricing ($29).