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Pipe Offset Calculator

The classic set / travel / run triangle. Enter your set and fitting angle — get the travel (center to center) and run instantly, in decimals and fractions.

In inches. The distance the pipe needs to move over (center to center).
The elbow angle you're using. 45° is the most common offset fitting.
Offset triangle (updates as you type)

About this calculator

A simple offset moves a pipe run sideways using two elbows of the same angle. The three numbers form a right triangle:

Travel = Set ÷ sin(Angle) — the length of the diagonal piece between the two fittings, center to center.

Run = Set ÷ tan(Angle) — how much straight-line distance the offset eats up along the original direction.

For 45° fittings this simplifies to the numbers every fitter knows: Travel = Set × 1.414 and Run = Set.

Remember travel is a center-to-center dimension — subtract the takeouts of both fittings to get the actual pipe cut length. Use our fitting takeout calculator for that.

Note: Travel is a center-to-center dimension. Subtract fitting takeouts to get pipe cut length. Results shown to the nearest 1/16".

Made by the makers of the TNB Roll Out Wheel

A truck-mounted pipe positioner that chucks up, rotates, and locks pipe for solo field welding. Built by pipe welders, for pipe welders.

See the roll out wheel