Calorie Burned Calculator
Calorie Burned
Calculator
Enter your weight, activity, and duration to instantly see how many calories you burned — using MET values from the Compendium of Physical Activities.
| Activity | MET | Calories / 30 min |
|---|---|---|
| Walking, moderate (3 mph) | 3.5 | ~123 kcal |
| Running, 6 mph | 9.8 | ~343 kcal |
| Cycling, moderate | 8.0 | ~280 kcal |
| Swimming, moderate | 5.8 | ~203 kcal |
| HIIT / Circuit training | 8.0 | ~280 kcal |
| Yoga | 2.5 | ~88 kcal |
| Weight training, vigorous | 6.0 | ~210 kcal |
Formula: Calories = MET × weight (kg) × duration (hours). Figures above use a 70 kg reference weight.
How Are Calories Burned Calculated?
This method is widely used because it's simple, requires no special equipment, and produces reasonably accurate estimates across a huge range of activities — from walking the dog to competitive running. It's the same underlying approach used by many fitness trackers and apps, though wearables often refine the estimate further using heart rate data.
What Exactly Is a MET?
A MET (Metabolic Equivalent of Task) is a standardized way of expressing how energy-intensive an activity is, relative to resting metabolism. Sitting quietly has a MET value of 1. Walking at a moderate pace is about 3.5 METs, meaning it burns roughly three and a half times more energy than sitting still. Vigorous running can reach 10-12 METs or more, representing ten to twelve times the resting energy expenditure.
Because MET values are standardized across large research studies measuring oxygen consumption during activity, they provide a fairly reliable, research-backed way to estimate energy expenditure without needing a metabolic testing lab. That said, they represent population averages — your own efficiency, fitness level, and effort can shift your actual burn somewhat higher or lower than the estimate.
Why Body Weight Matters So Much
Moving a heavier body requires more energy than moving a lighter one, which is why body weight is directly multiplied into the calorie burn formula. Two people walking side by side at the same pace for the same duration will burn different amounts of energy if their body weights differ — the heavier person burns more, simply due to the greater mechanical work required to move their mass.
This is also why calorie burn estimates change over time as your weight changes. Someone who loses 10 kg will burn somewhat fewer calories doing the exact same activity at the exact same intensity, which is a normal and expected part of the weight-loss process — not a sign that something has gone wrong with your metabolism.
Factors MET Estimates Don't Fully Capture
While MET-based calculations are a solid, research-backed starting point, they are still estimates rather than precise measurements. Several factors can meaningfully shift your actual calorie burn:
- Fitness level: Highly trained individuals are often more efficient at a given activity, which can slightly lower actual calorie burn compared to the MET average for that same activity
- Muscle mass: More muscle mass generally increases resting and active energy expenditure
- Exact intensity: "Running at 6 mph" covers a range of real-world efforts — incline, terrain, and pacing all affect true energy cost
- Environmental conditions: Exercising in heat, cold, wind, or at altitude can increase energy expenditure beyond standard MET tables
- Age and sex: These influence overall metabolic rate but are not directly part of the standard MET formula, unlike some heart-rate based calculators
For most everyday purposes — tracking general activity, setting fitness goals, or understanding rough energy balance — MET-based estimates are more than adequate. For clinical or research-grade precision, direct measurement of oxygen consumption (VO2) remains the gold standard, though this requires specialized lab equipment most people will never need.
The Afterburn Effect (EPOC)
Many people are surprised to learn that calorie burning doesn't stop the moment exercise ends. After intense exercise, especially strength training or HIIT, your body continues to consume extra oxygen and burn additional calories for hours afterward as it restores itself to a resting state — a phenomenon known as Excess Post-Exercise Oxygen Consumption (EPOC), often nicknamed the "afterburn effect."
This calculator, like most MET-based tools, estimates calories burned only during the activity itself, and does not include this afterburn component. For higher-intensity workouts, actual total calorie expenditure across the following hours may be modestly higher than the number shown here.
MET-Based vs Heart-Rate-Based Estimates
Fitness trackers and smartwatches often use heart-rate-based formulas instead of, or in addition to, MET tables. These formulas typically factor in age, sex, weight, and heart rate together, aiming to personalize the estimate further. Both approaches have strengths: MET tables are consistent and don't require any wearable hardware, while heart-rate-based methods can better reflect an individual's specific effort level and cardiovascular response on a given day. Neither method is perfectly precise — both are reasonable estimates rather than exact measurements, and it's normal to see modest differences between a MET-based calculator like this one and your fitness tracker's reading for the same workout.
NEAT — The Calories You Burn Without "Exercising"
Formal exercise is only part of your total daily calorie burn. Non-Exercise Activity Thermogenesis (NEAT) refers to the energy used for everyday movement outside of structured workouts — walking around the house, fidgeting, taking the stairs, standing instead of sitting, and doing chores. For many people, NEAT accounts for a meaningful share of total daily energy expenditure, and increasing it gradually (parking further away, taking walking breaks, standing more) can add up over a week even without formal exercise sessions.
Tips to Increase Calorie Burn Safely
- Add intervals: Alternating higher and lower intensity within a session (like brief running bursts during a walk) increases total energy expenditure and can boost the afterburn effect
- Include strength training: Building muscle mass modestly raises resting metabolic rate over time, in addition to the calories burned during the session itself
- Increase daily movement (NEAT): Small changes like walking meetings, taking stairs, or short movement breaks add up meaningfully over a week
- Progress gradually: Increasing duration or intensity slowly reduces injury risk while still increasing total calories burned over time
- Stay consistent: Regular moderate activity across a week generally burns more total calories than occasional intense sessions
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