Calorie Burn Estimation predicts energy use during activity from heart rate, movement, and models.
| Method | Inputs | Typical error |
|---|---|---|
| Wearable HR + motion | Optical HR, accelerometer | Moderate; improves with strong HR signal |
| MET tables | Activity type and duration | Moderate to high; ignores individual variation |
| Power-based (cycling) | Watts and efficiency | Lower when calibrated |
| GPS pace (running) | Pace, grade, mass | Moderate; grade and form matter |
Fuel uses device data plus your history to refine burn estimates over time.
Active Calories are calories burned above resting during movement and exercise.
Wearable Metrics capture activity and recovery data that inform daily plans.
Heart Rate Zones group intensity to guide cardio training.
Total Daily Energy Expenditure (TDEE) is the sum of calories you burn each day.
