Convert FIT to CSV every point of a Garmin activity in a spreadsheet

The columns

• time_utc

  Time of the point, ISO 8601, in UTC.

• latitude, longitude

  In decimal degrees; empty when the point has no valid position.

• altitude_m, distance_m

  Elevation and cumulative distance, in metres.

• speed_m_s

  Speed in metres per second (multiply by 3.6 for km/h).

• heart_rate_bpm, cadence_rpm

  Heart rate in beats per minute, cadence as recorded by the device.

• power_w, temperature_c

  Power in watts, temperature in degrees Celsius.

Good to know

The file is comma-separated, with a dot as decimal separator and units in the column names, so it reads the same in every country and every tool.

A value that the device did not record stays empty: a watch without a power meter gives an empty power column.

Wrong values can be cleared before the export: heart rate and power spikes, impossible positions and backwards times each have their own repair on the same page.

Example

The first lines of the sample “Healthy bike ride” above the drop zone (3,601 rows in all):

time_utc,latitude,longitude,altitude_m,distance_m,speed_m_s,heart_rate_bpm,cadence_rpm,power_w,temperature_c
2026-10-26T13:05:00Z,45.764,4.8357,42,0,7.641,129,86,207,14
2026-10-26T13:05:01Z,45.7640702,4.8357004,42,7.81,7.814,128,86,220,14

Questions