Understanding Calorie Expenditure

How to calculate calories burned during exercise?

The Metabolic Equivalent of Task (MET) is a standardized measure used to estimate the energy cost of physical activities. One MET is defined as the energy used by the body while resting quietly. By comparing the intensity of an exercise to your resting state, we can estimate total energy expenditure using the following formula:

Calories = MET × weight (kg) × time (hours)

Using the Calorie Estimator: an example

Consider a scenario where a 75kg person goes for a 30-minute run at a steady pace.

Step-by-step calculation:

1. Identify the MET value: For running at a moderate pace, the MET value is approximately 9.8.
2. Convert duration to hours: 30 minutes divided by 60 minutes equals 0.5 hours.
3. Multiply values: 9.8 (MET) × 75 (kg) × 0.5 (hours) = approx 367 kcal.

Frequently Asked Questions

What is a MET?
MET stands for Metabolic Equivalent of Task. It represents the ratio of your active metabolic rate to your resting metabolic rate. A MET of 4 means you are using 4 times the energy you would use while sitting still.

Does age affect calorie burn?
Yes. As we age, our basal metabolic rate typically slows down due to changes in muscle mass and hormonal shifts. While MET values provide a strong general estimate, older adults may burn slightly fewer calories than younger adults for the same activity.

How accurate are these estimates?
These calculations are scientific estimates based on average populations. Individual accuracy depends on personal factors such as body composition (muscle vs. fat), fitness level, and environmental conditions like heat or elevation.