Pipefitter's Mate: Pipe Offset

Pipefitter’s Mate

About this app

Stop scrap. Pipefitter's Mate is the offset calculator built for real pipefitters — fast enough for the jobsite, accurate enough for the fab shop.

Type your run and offset. The app gives you exact cut lengths, takeoffs, setbacks, weld gaps, and a visual spool diagram you can take to the saw. From simple 45° offsets to compound and rolling offsets — same workflow, same speed.

WHAT IT DOES
• Pipe offset calculations: 45°, 22.5°, 11.25°, 60°, custom angles
• Rolling offsets and compound offsets
• Cut length, travel, takeoff, setback — all displayed at once
• Weld gap math for multi-stick spools (gap is per joint, not per pipe end)
• ASME B16.9 elbow dimension reference built in
• Visual spool diagram updates as you type
• Catches input errors before you cut steel (12-rule validation engine)

WHO IT'S FOR
Pipefitters, steamfitters, welders, plumbers, sprinkler-fitters, gas-fitters, HVAC pros — apprentice or journeyman. If you lay out pipe for a living, this is your calculator.

BUILT FOR THE JOBSITE
• Works fully offline — no signal, no problem
• No ads, no login, no account
• Imperial and metric, switch instantly
• Dark mode for the welding shack
• Keep-screen-on so the phone doesn't sleep mid-layout

QUESTIONS, BUGS, FEATURE REQUESTS
Visit pipefittersmate.com — every email gets read and fixes ship fast.

What’s new

• Scaled-to-fit diagram view — toggle to see real proportions
• Larger spool diagram — fills 80% of the drawing area
• Readable labels when zooming — dimension text grows with pinch-zoom
• Dark mode enabled by default for field visibility
• Bug fixes and performance improvements