What this calculator does
Rolling offset (pipefitting) works out true offset, travel and run for a pipe that must dodge an obstacle both sideways and up. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
The inputs explained
| Field | What to enter |
|---|---|
| Rise (vertical offset) (in) | A number, measured in in. Starts at 12. |
| Set (horizontal offset) (in) | A number, measured in in. Starts at 9. |
| Fitting angle | Choose from 22.5°, 30°, 45°, 60°, 90°. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with rise (vertical offset)
Every other input is held at the calculator’s starting values while rise (vertical offset) varies. Select any row to load that scenario into the calculator.