3D Pipe Offset Calculator

Offset3D

See your rolling offset in 3D. Enter rise, roll, and offset — get travel, cut length, and fitting takeouts in one tap. The pipe offset calculator that finally shows you the geometry.

$4.99 One-time purchase

Coming Soon to Google Play

Offset3D Rolling 3D mode with 3D pipe and computed angle

Rolling Offsets, Solved

Built for pipefitters, plumbers, apprentices, and journeymen who work offsets daily.

See It in 3D

Interactive Three.js pipe model you can rotate, pan, and zoom. Watch the travel piece change as you enter rise, roll, and offset.

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Two Calculation Modes

Simple Offset (2D) for the 90% case — rise + fitting angle → travel, run, cut length. Rolling Offset (3D) for the hard case with offset and roll.

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Fitting Takeout Library

Built-in takeouts for weld, threaded, socket weld, and grooved fittings. Sizes 1/2" through 8". Angles 60°, 45°, 30°, 22.5°, 11.25°.

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Learning Mode

Toggle "fx" to see the formula with your numbers substituted. Perfect for apprentices learning the math behind the number.

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Flexible Input

Type 3-1/2, 3.5, or 88.9mm — all the same value. One-tap toggle between fraction/decimal and imperial/metric.

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Export & Share

Save your calculation as a PDF or PNG. Share via email, messaging, or any app on your phone. Annotated diagram with all inputs and results.

Replace the hardware calculator

Existing pipe-trades calculators give you the number but not the understanding. Offset3D gives both — an interactive 3D pipe model as the primary interface, with the math exposed step-by-step for learning.

Works fully offline. No accounts. No ads. No subscriptions. Buy once, use forever.