Oura calculates your daily energy expenditure using METs or Metabolic Equivalents. MET is a common measure used to express the energy expenditure and intensity of different physical activities. If the MET value of a specific activity is 4, it means that you’re burning 4 times as many calories as you would burn while resting.

The time you spend doing different activities with specific MET values can be expressed as MET minutes. For example:

• 30 min x brisk walking (MET value=3) = 90 MET minutes
• 30 min x jogging (MET value=7) = 210 MET minutes

Learn more: Metabolic Equivalent on Wikipedia