Are you seeking a numeric answer? It's accurate. It's the same accuracy as the GPS accuracy of the device. If the GPS on the iPhone can't obtain a good signal, it may use Wi-Fi triangulation which will reduce the accuracy.
How accurate is iPhone location tracking?
If your phone is in position to receive 4+ strong satellite signals, most phones GPS should be accurate within 20 feet. A weak signal can quickly reduce that to 100+ feet or even 1,000+ feet! However, most of us will be using a more rudimentary GPS chip for a while.
Can the Find My iPhone location be wrong?
There are several other instances where the app has shown the wrong location. Even after refreshing, quitting the app, restarting the iphone, recalibrating the compass, it still shows the wrong location.
Why is find my phone showing wrong location?
Sometimes, Find My iPhone has a wrong location because it isn't connected to a network. Find My iPhone needs a connection to collect location information and send it to Apple. Make sure the iPhone is on a cellular network or at least a Wi-Fi network.