Calorie Burn Calculator (By Activity)

What a MET Value Actually Means

MET stands for Metabolic Equivalent of Task, a standardized way of expressing how much energy an activity requires compared to sitting quietly, which is defined as exactly 1 MET. An activity with a MET value of 8 burns roughly eight times as much energy per minute as sitting still. This standardization is what lets exercise scientists compare wildly different activities — swimming, weightlifting, dancing — on a single consistent scale, and it's the backbone of most calorie-burn estimates used in fitness research and wearable devices.

How This Calculator Estimates Your Burn

The formula multiplies the activity's MET value by your body weight in kilograms and by the duration of the activity in hours: calories = MET × weight (kg) × time (hours). This approach, published in the Compendium of Physical Activities used by exercise researchers worldwide, is the same underlying method used by most fitness trackers and calorie-burn apps, though wearables often refine it further using heart rate data for a more personalized estimate.

Why Body Weight Changes the Result So Much

Heavier bodies require more energy to move through space, so the same activity burns meaningfully more calories for a heavier person than a lighter one at an identical MET value and duration. This is a basic principle of biomechanics — more mass means more work done against gravity and momentum with every step, stroke, or rep — and it's why calorie-burn estimates that ignore body weight, like flat "300 calories per spin class" claims, are only accurate for people near the specific weight those numbers were calculated for.

Choosing the Right Activity Entry

This calculator includes MET values across a wide range of common activities, from gentle yoga (2.5 METs) up to vigorous jump rope and running (10+ METs), each reflecting typical effort levels for that activity. Where an activity has multiple intensity levels available — like walking, running, cycling, and swimming — choose the entry that best matches your actual pace and effort rather than defaulting to the first option, since intensity has a large effect on the final number.

Understanding the Limits of MET-Based Estimates

MET values represent population averages for a "typical" person performing that activity, so individual factors like fitness level, technique efficiency, terrain, and even ambient temperature can shift your real burn above or below the estimate. Highly trained individuals often burn somewhat less than the MET estimate at a given activity because their movement is more efficient, while beginners often burn somewhat more due to less efficient movement patterns. Treat this number as a solid planning estimate rather than an exact lab measurement, and if you have a step-based activity specifically, our Step to Calorie Converter offers another angle using step count instead of duration.

A Quick Tip on Combining Activities

For a workout that mixes several activities, like a circuit combining running and weight training, calculate each segment separately using its own duration and MET value, then add the totals together for a more accurate combined estimate than picking a single 'average' activity for the whole session.

Frequently Asked Questions