We get that question a bit, for example, many question why the calories on a manually entered workout are so different from that on shown on a Treadmill or during a workout where heart rate is used.

The short answer is that if you don't use heart rate to calculate calories, we have to estimate effort levels. If you use heart rate or not, please see the following details on how Fitdigits calculates caloric burn.

Fitdigits Calorie Calculations:

https://my.fitdigits.com/overview/calories

If you have any further questions, let us know!