Miter Cut Calculator

Lay out mitered pipe elbows. Enter pipe OD, the total turn angle, and how many pieces you want — get the cut angle and cutback for marking.

In inches. For 6" NPS pipe, enter 6.625.
In degrees. The total change in direction (e.g. 90 for a 90° elbow).
More pieces = smoother turn, more cuts. A 2-piece 90 is a single miter joint.
Assembled elbow (updates as you type)
Single cut layout — mark the cutback and wrap around

About this calculator

A mitered elbow is built from straight pipe sections cut at an angle. For a total turn angle split across a number of pieces:

Cut angle = Turn ÷ (2 × (Pieces − 1))

The two end pieces get one angled cut each; intermediate pieces get angled cuts on both ends (2× the cut angle across the piece). The cutback is how far the cut drops from a square line at the far side of the pipe:

Cutback = OD × tan(Cut angle)

Mark the cutback on the pipe, wrap a straight line between the high and low points, and cut. A 2-piece 90° elbow, for example, uses a 45° cut angle.

Note: Results are nominal layout dimensions. Verify your marks with a wraparound before cutting, and account for kerf width and fit-up gap in your final layout.

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