Calories Burned Calculator

About Calories Burned Calculator

How the Calculation Works

The formula used is:

Calories = MET x Weight (kg) x Duration (hours)

Variable	Meaning	Example
MET	Metabolic Equivalent of Task - how many times more energy the activity uses compared to sitting	Running at 8 km/h = MET 8.3
Weight	Your body weight in kilograms	70 kg
Duration	Exercise time in hours	0.5 hours (30 minutes)
Calories	Estimated total kilocalories burned	8.3 x 70 x 0.5 = 291 kcal

What Are MET Values?

A MET of 1.0 equals your resting metabolic rate - the energy you burn sitting still (approximately 1 kcal per kg per hour). An activity with a MET of 8 burns roughly 8 times more energy than rest. MET values come from the Compendium of Physical Activities, a research database maintained by Arizona State University with over 800 measured activities.

Activity MET Reference

Activity	MET Value	Calories / 30 min (70 kg person)	Intensity Level
Walking (5 km/h)	3.5	123	Light
Yoga	3.0	105	Light
Stretching	2.5	88	Light
Cycling (moderate)	6.8	238	Moderate
Swimming (moderate)	7.0	245	Moderate
Weight training	5.0	175	Moderate
Running (8 km/h)	8.3	291	Vigorous
Running (10 km/h)	9.8	343	Vigorous
Running (12 km/h)	11.8	413	Vigorous
Jump rope	12.3	431	Very vigorous
Boxing (sparring)	12.8	448	Very vigorous
HIIT	12.0	420	Very vigorous

How Body Weight Affects Calorie Burn

Heavier people burn more calories doing the same activity because they are moving more mass. Here is the same 30-minute run at 8 km/h (MET 8.3) for different weights:

Body Weight	Calories Burned (30 min)
55 kg (121 lbs)	228 kcal
70 kg (154 lbs)	291 kcal
85 kg (187 lbs)	353 kcal
100 kg (220 lbs)	415 kcal

Exercise Duration Comparisons

To burn approximately 500 calories (a common target), a 70 kg person would need:

Activity	Time Needed for ~500 kcal
Walking (5 km/h)	~2 hours 3 minutes
Cycling (moderate)	~63 minutes
Running (8 km/h)	~51 minutes
Running (12 km/h)	~36 minutes
HIIT	~36 minutes
Swimming (moderate)	~61 minutes

Accuracy and Limitations

Factor	Effect on Accuracy
Individual fitness level	Trained individuals may burn slightly fewer calories at the same MET due to efficiency
Exercise intensity variation	MET values assume a consistent intensity; actual effort varies during a session
EPOC (afterburn)	High-intensity exercise burns additional calories for hours after the session - not included in the estimate
Body composition	More muscle mass increases calorie burn slightly, but MET calculations do not account for body fat percentage
Environmental factors	Heat, cold, altitude, and terrain all affect calorie burn but are not factored in

MET-based estimates are within 10-20% of actual calorie burn for most people. They are best used as a planning tool and general guide rather than a precise measurement. The 2024 Compendium update (Herrmann et al., published in the Journal of Sport and Health Science) revised several entries based on two decades of new indirect-calorimetry data, so some older MET charts still in circulation are now slightly out of date - the figures on this page reflect the most recent values where revised.

Calories and Weight Management

One pound of body fat stores approximately 3,500 kcal, so burning an extra 500 kcal per day through exercise equates to roughly one pound per week in theoretical fat loss. Research from the National Institutes of Health shows real-world results are slower because metabolic adaptation reduces resting energy expenditure as weight drops. Combining moderate exercise with a small dietary calorie deficit is more sustainable than exercise alone. The TDEE calculator shows total daily energy expenditure including exercise, which helps plan intake.

How Much Exercise Should You Do?

The CDC and World Health Organization recommend 150 minutes of moderate-intensity activity per week, 75 minutes of vigorous-intensity activity, or an equivalent combination, plus muscle-strengthening on 2 or more days. Doubling these amounts (300 min moderate or 150 min vigorous) produces additional health benefits. Activities at 3.0-5.9 METs count as moderate, and 6.0+ METs count as vigorous.

Weekly Goal	Example Plan	Approx. Weekly Calorie Burn (70 kg)
CDC minimum (moderate)	5 x 30 min brisk walking (5 km/h)	~615 kcal
CDC minimum (vigorous)	3 x 25 min running (8 km/h)	~727 kcal
CDC bonus target	5 x 45 min cycling (moderate)	~1,785 kcal
Weight-loss level	6 x 45 min mix (run + cycle)	~2,600 kcal

Why Fitness Trackers Give Different Numbers

Smartwatches like Garmin, Fitbit, and Apple Watch typically report lower numbers than MET-based calculators for the same session. A 2020 Stanford study published in the Journal of Personalized Medicine tested seven consumer wearables against lab gold-standard indirect calorimetry and found energy-expenditure errors of 27-93%, with most devices underestimating on steady-state cardio and overestimating on strength training. MET-based calculations give the average figure the population-level research supports, while wearable algorithms try to personalise using heart rate and accelerometer data - but that personalisation is not always accurate.

EPOC - The Afterburn Effect

Excess Post-exercise Oxygen Consumption (EPOC) is the extra energy your body burns for hours after a hard session as it restores ATP stores, clears lactate, and repairs muscle. Research in the European Journal of Applied Physiology places EPOC at roughly 6-15% of the exercise session's calorie total for moderate work, rising to 15-20% after vigorous interval work. A 30-minute HIIT session that burns 420 kcal during exercise could generate another 60-80 kcal over the following 24 hours. MET-based estimates do not include EPOC, so high-intensity totals are slightly conservative.

Gross vs Net Calories Burned

The MET formula produces gross calorie burn - the total energy used during exercise, including the amount you would have burned at rest anyway. To get net calories (the additional energy from exercising rather than sitting), subtract your resting burn for the same duration. A 70 kg person at rest burns about 1 kcal per kg per hour, so 30 minutes of rest = 35 kcal. Net calories for a 30-minute run burning 291 kcal gross = 291 - 35 = 256 kcal extra. Most calorie-tracking apps and this calculator display gross burn; keep this in mind if you are pairing it with a nutrition log.

Cardio vs Strength Training for Calorie Burn

Cardio burns more calories during the session, but strength training produces a bigger downstream metabolic effect. Weight training sits around MET 5.0 for typical bodybuilding-style work and MET 6.0 for heavier compound lifts, which looks modest next to running at MET 9-12. The trade-off is muscle mass: each additional pound of lean muscle burns an extra 6-10 kcal per day at rest (research published in the American Journal of Clinical Nutrition). Gaining 5 lb of muscle raises daily resting burn by 30-50 kcal, which compounds across a year. Most sports-science guidance recommends combining both, which is why the CDC guideline includes muscle-strengthening as a separate weekly requirement.

Goal	Better Choice	Why
Rapid session calorie burn	Cardio (running, HIIT, jump rope)	High MET values, sustained steady state
Long-term metabolic rate	Strength training	Muscle mass raises BMR
Cardiovascular health	Moderate cardio	Directly improves VO2 max and heart health
Joint-friendly burn	Swimming, cycling, elliptical	Low impact, high MET options available
Time-efficient	HIIT + EPOC	High burn in short duration plus afterburn

Calorie Burn Reference by Weight (lbs)

For quick imperial lookups without switching the calculator to lbs, this table shows 30-minute calorie burn by body weight and activity:

Activity	125 lb	155 lb	185 lb	215 lb
Walking (3.5 mph)	149	185	220	256
Cycling (moderate)	340	421	503	584
Swimming (moderate)	298	369	440	511
Running (6 mph)	417	517	617	716
HIIT	510	633	755	877
Boxing	544	675	805	936

Common Mistakes When Using MET Values

• Using self-paced speed in a speed-specific row. The Compendium specifies a pace. If you jog at 9 km/h but pick the "running 12 km/h" entry, your estimate is inflated.
• Forgetting that MET assumes steady intensity. Circuit and CrossFit-style sessions with rest periods average closer to 6-8 MET than the 10+ people often assume.
• Treating gross calories as net. Subtracting 3,500 kcal gross from diet each week will under-deliver on fat loss because some of that burn is BMR you were spending anyway.
• Using body weight alone for lean athletes. MET assumes average body composition. Very lean, muscular people burn slightly more, very obese people slightly less than the formula predicts. The 10-20% accuracy range covers most users but trained athletes may need tracker-based estimates.

For running-specific planning, the pace calculator helps match distance and speed to calorie targets. For training at the right intensity, the target heart rate calculator shows personal heart rate zones. All calculations run in-browser with no data stored.

Sources

• 2024 Adult Compendium of Physical Activities - Arizona State University
• Herrmann et al. (2024), Journal of Sport and Health Science - Third update of MET values
• CDC - Physical Activity Guidelines for Adults
• WHO - Physical Activity Fact Sheet
• ACSM - Physical Activity Guidelines
• NHS UK - Physical Activity Guidelines for Adults