Calories Burned Calculator — MET and Heart Rate Methods Explained
The calories burned calculator estimates how much energy your body expends during physical activity. Whether you are planning a weight-loss programme, tracking your workout output, or simply curious about the energy cost of everyday movement, understanding calorie expenditure helps you make more informed decisions about nutrition and exercise. This tool supports two scientifically validated approaches: the MET-based formula for all activity types, and the optional heart rate-based formula for aerobic exercise where your heart rate is known.
What Is a MET Value?
MET stands for Metabolic Equivalent of Task. One MET is defined as the energy expenditure of sitting quietly — approximately 1 kcal per kilogram of body weight per hour. An activity with a MET of 4 therefore burns four times more energy than sitting still for the same duration. MET values have been compiled into the Compendium of Physical Activities, a standardised reference used in research, clinical settings, and fitness applications worldwide.
Because MET values are based on oxygen consumption data averaged across many participants, they represent population-level estimates. Individual results will vary based on fitness level, body composition, environmental conditions, and exercise technique. As a rule of thumb, MET-based calculations are accurate to within 10–20% for most healthy adults, which is sufficient for everyday planning purposes.
The MET Calorie Formula
The core formula is straightforward:
Calories (kcal) = MET × Weight (kg) × Duration (hours)
For example, a person weighing 75 kg who cycles at moderate intensity (MET 8.0) for 45 minutes (0.75 hours) burns:
8.0 × 75 × 0.75 = 450 kcal
This formula makes it easy to compare activities and adapt to different body weights. A heavier person burns more calories at the same MET because moving a larger mass requires proportionally more energy. Conversely, losing weight slightly reduces the calorie cost of the same workout, which is why periodic recalculation is useful during a sustained fitness programme.
MET Values for Common Activities
The following table shows representative MET values and approximate calorie burn rates for a 70 kg adult. These values come from the Compendium of Physical Activities and are used in this calculator.
| Activity | MET | kcal/hr (70 kg) |
|---|---|---|
| Sleeping | 0.9 | 63 |
| Sitting (rest) | 1.3 | 91 |
| Yoga | 2.5 | 175 |
| Walking (5 km/h) | 3.8 | 266 |
| Hiking | 6 | 420 |
| Weight training | 6 | 420 |
| Jogging (8 km/h) | 7 | 490 |
| Cycling (moderate) | 8 | 560 |
| Swimming | 8.3 | 581 |
| Running (10 km/h) | 9.8 | 686 |
| Jump rope | 12.3 | 861 |
Heart Rate-Based Calorie Estimation
For aerobic exercise, heart rate provides an individualised signal of exercise intensity. The calculator optionally uses the Keytel et al. (2005) formula, which was derived from a study involving over 100 participants performing graded exercise tests while wearing heart rate monitors and metabolic analysers. The formulas are:
Men:
Cal/min = (Age × 0.2017 + Weight × 0.09036 + HR × 0.6309 − 55.0969) / 4.184
Women:
Cal/min = (Age × 0.074 + Weight × 0.05741 + HR × 0.4472 − 20.4022) / 4.184
The division by 4.184 converts kilojoules per minute to kilocalories per minute. This method works best during sustained aerobic activity at a heart rate between 90 and 200 bpm. Below 90 bpm the formula tends to underestimate calorie burn; above 200 bpm, results should be treated as approximate.
The heart rate method accounts for your individual cardiovascular response to exercise, which can differ from population averages. For example, a well-trained endurance athlete and a sedentary adult might have similar body weights but very different heart rate responses to the same running pace — and therefore different calorie burn rates per minute. In practice, comparing MET and HR results gives you a useful range to work within.
How Body Weight Affects Calorie Burn
Weight is the single biggest variable in the MET formula. Because calorie expenditure scales linearly with body weight, the differences can be substantial across a population:
- A 60 kg person running at 10 km/h (MET 9.8) for 30 minutes burns approximately 294 kcal.
- A 75 kg person doing the same run burns approximately 368 kcal — 25% more.
- A 90 kg person burns approximately 441 kcal — 50% more than the 60 kg person.
This means that as you lose weight, the same workout becomes slightly less effective in calorie terms. For long-term weight management, this is one reason why increasing exercise duration or intensity over time — or periodically recalculating with your current weight — helps maintain a consistent energy deficit.
Choosing High-Calorie-Burn Activities
For maximum calorie expenditure in minimum time, high-MET activities are most efficient. Jump rope (MET 12.3) and running (MET 9.8) burn significantly more calories per minute than walking (MET 3.8) or yoga (MET 2.5). However, sustainability matters equally — an activity you can perform consistently three to five times per week will produce far better long-term results than a very intense activity you can only sustain once a week before needing recovery.
Resistance training (MET 6.0) deserves special mention. Although its acute calorie burn is lower than high-intensity cardio, it increases muscle mass over time, which raises your resting metabolic rate (BMR). A higher BMR means more calories burned throughout the day even at rest, making strength training a valuable complement to cardio for long-term weight management.
Calorie Burn and Weight Loss
A commonly cited guideline is that a calorie deficit of approximately 7,700 kcal is needed to lose 1 kg of body fat. This means that burning an extra 500 kcal per day through exercise would theoretically produce about 1 kg of fat loss per week — though real-world results vary because the body adapts through changes in appetite, non-exercise activity, and metabolic efficiency.
This calculator is a planning tool, not a precise physiological instrument. Use the results to understand the approximate scale of calorie expenditure from your activities and to compare different exercise options. For clinical nutrition planning, sports dietetics, or medical purposes, consult a qualified health professional.