A fault location of a fault on a line of an electrical energy supply network is determined from measured current and voltage values at the first and second line ends. Highly accurate fault location with measured values from both line ends is provided even in the absence of temporal synchronization of the measurements at the line ends. Characteristics of first and second fictitious fault voltage values present at a fictitious fault location on the line are defined using the first and second current and voltage values. A fictitious fault location is determined for which the characteristic of the first fictitious fault voltage values corresponds most closely to the characteristic of the second fictitious fault voltage values. The fictitious fault location is used as the actual fault location. We also describe a correspondingly configured device and a system for determining a fault location.