# Reserve factor

## Description

A measure of strength frequently used in Europe is the Reserve Factor (RF). With the strength and applied loads expressed in the same units, the Reserve Factor can be defined as a funcion of the Proof Strength and the Proof Load as shown.

The applied loads have any factors, including factors of safety applied.

Related formulas## Variables

RF | reserve factor (dimensionless) |

PS | proof strength (dimensionless) |

PL | proof load (dimensionless) |