This tool has been retired, please head over to to use the updated calculator. It’s free to use but you’ll need to sign up.

The fastest tool to determine the risk category according to the EU Pressure Equipment Directive (PED).
Once the category is determined, the conformity assessment regime (module) can be selected.

To use this our calculator, select from piping, vessel, or steam generator. The maximum allowable pressure and either the vessel volume or pipe diameter are then required. You also need to give the fluid state (liquid or gas) and the fluid group.

Save your calculations and return to them at any time.