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    Data

    What a watch can and cannot tell you about a run

    Review distance, pace and time with the conditions of your run, and understand the limits of sensor readings.

    A smartwatch with a black face showing the time, resting on a pale surface.

    A watch can keep distance, pace and time together in one run record. Those fields are useful when comparing repeated routes or reviewing a week of activity.

    Sensor accuracy varies by measurement and conditions. A systematic review of Apple Watch measurements found differences between metrics, with energy expenditure estimates particularly variable.

    Compare records from the same device and note the route and weather. Those details help explain why two sessions can produce different numbers.

    If a watch run is missing from Paceful, check that it reached Apple Health on iOS or Health Connect on Android and that Paceful has permission to read it.

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