Calorie Burn
Calculator
Calculate exactly how many calories you burn for any activity — walking, running, cycling, swimming, HIIT, strength training, and 45+ more — based on your weight, duration, and intensity.
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Calorie Burn Calculator: How Many Calories Does Your Workout Burn?
One of the most common frustrations in fitness is the disconnect between effort and results. You work out hard, but the scale barely moves. Or you track calories religiously but can’t figure out why your deficit isn’t creating the fat loss you expected. The missing piece is almost always an accurate picture of how many calories your specific activities actually burn — not the inflated estimates on gym equipment or fitness apps that routinely overstate burn by 20–40%. This free calorie burn calculator uses validated MET (Metabolic Equivalent of Task) values from published exercise science research to give you the most accurate estimate possible for 45+ activities at three intensity levels.
Quick example: A 70 kg person walking at moderate pace (3 mph) for 30 minutes burns approximately 122 calories. The same person running at 6 mph for 30 minutes burns approximately 350 calories — nearly 3× more. Use the calculator above with your exact weight, activity, and duration for a personalised result.
How Calories Burned Are Calculated: The MET Method
The gold-standard method for estimating exercise calorie burn is the MET (Metabolic Equivalent of Task) formula:
One MET represents the energy expenditure of sitting quietly, approximately 1 kcal per kg of bodyweight per hour. An activity with a MET of 8 burns 8 times more energy than sitting still. This system was developed by exercise physiologists to standardise the energy cost of physical activities across different body weights and is used in clinical research worldwide, catalogued today in the Compendium of Physical Activities, the reference database this calculator’s MET values are drawn from.
How the Calorie Burn Calculator Formula Works
This calculator measures how much energy your body uses during a specific activity, based on how intense that activity is, how much you weigh, and how long you do it for. The units are always kilocalories (what nutrition labels call “calories”). Read the result as an estimate of energy expended during the activity itself, not a precise clinical measurement. MET values in the underlying database are population averages measured across many people, so your actual burn depends on your individual fitness level, technique, and effort; fitter people tend to burn slightly fewer calories than average at the same MET-rated activity, since their bodies work more efficiently.
Identify the inputs
You enter body weight, pick an activity from the list, choose an intensity level (Light, Moderate, or Vigorous), and set the duration in minutes.
Apply the formula
The calculator looks up the MET value for your chosen activity and intensity, converts your duration from minutes to hours, then multiplies MET × weight (kg) × duration (hours).
Perform the calculation
Using the default example of a 70kg person walking at a moderate pace (MET 3.5) for 30 minutes: 3.5 × 70 × 0.5 = 122.5 kcal.
Interpret the result
122.5 kcal is roughly 4.1 kcal per minute. The calculator also shows this in other terms, like the equivalent number of minutes of brisk walking, to make the number easier to relate to.
3 Real-Life Examples
1. A cyclist tracking a lunchtime ride
A 68kg cyclist rides at a moderate pace (12 mph, MET 10.0) for 40 minutes during a lunch break.
That’s about 11.3 kcal per minute, roughly double the burn rate of a moderate walk, making even a short lunchtime ride a meaningful contributor to a daily calorie deficit.
2. Comparing intensity levels for the same HIIT session
An 82kg person does a 25-minute general HIIT session, comparing the difference between doing it at a Light versus Vigorous intensity.
Pushing the same 25-minute session from Light to Vigorous intensity burns roughly 75% more calories, showing how much intensity matters compared to simply doing more minutes at an easier pace.
3. Tracking a household chore in pounds
A 154 lb person spends 45 minutes on moderate-effort house cleaning (MET 3.0), using the lbs unit toggle.
Even a routine chore like cleaning burns a meaningful amount of energy over 45 minutes, a useful reminder that non-exercise activity throughout the day adds up alongside structured workouts.
MET Values for Popular Activities
| Activity | Light MET | Moderate MET | Vigorous MET | Cals/hr (70 kg, moderate) |
|---|---|---|---|---|
| Walking (3 mph) | 2.8 | 3.5 | 4.3 | 245 |
| Running (6 mph) | 9.0 | 10.0 | 11.0 | 700 |
| Cycling (12 mph) | 8.0 | 10.0 | 12.0 | 700 |
| Swimming (freestyle) | 7.0 | 9.0 | 11.0 | 630 |
| HIIT | 8.0 | 10.0 | 14.0 | 700 |
| Weight training | 3.0 | 5.0 | 6.0 | 350 |
| Yoga (hatha) | 2.0 | 2.5 | 3.0 | 175 |
| Basketball | 5.0 | 7.0 | 9.0 | 490 |
| Jump rope | 8.0 | 11.0 | 14.0 | 770 |
| House cleaning | 2.0 | 3.0 | 4.0 | 210 |
Walking vs Running: Which Burns More Calories?
This is one of the most common questions in fitness — and the answer depends entirely on how you frame it. Running burns significantly more calories per minute, but the comparison changes when measured per kilometre.
- Per minute: Running (6 mph) burns roughly 3× more calories than walking (3 mph) — approximately 11.7 kcal/min vs 4.1 kcal/min for a 70 kg person
- Per kilometre: Running and walking burn approximately similar total calories — because running covers a kilometre in less time, the per-minute advantage largely cancels out. A 70 kg person burns ~60–70 kcal per km whether walking or running
The practical implication: if your goal is maximum calorie burn in a fixed time window, running wins decisively. If you’re covering a fixed distance and total burn is the goal, either activity is comparable. If you’re recovering from injury or simply prefer walking, you’re not leaving much behind in terms of total energy expenditure per distance covered.
How Body Weight Affects Calorie Burn
Body weight is directly proportional to calorie burn in the MET formula — heavier people burn more calories doing the same activity for the same duration. A 90 kg person burns approximately 29% more calories than a 70 kg person doing identical exercise. This means:
- As you lose weight, your calorie burn from exercise decreases — you need to gradually increase intensity or duration to maintain the same total burn
- Heavier individuals often find weight-bearing exercises (walking, running) more calorically demanding than lighter individuals
- Non-weight-bearing activities (swimming, cycling) are less affected by body weight differences
Calories Burned for Weight Loss: What You Actually Need to Know
The commonly cited figure is that 7,700 calories of deficit equals approximately 1 kg of fat loss. At a 500 kcal daily deficit, that’s roughly 1 kg of fat per two weeks. The reality is more nuanced:
- Exercise alone is inefficient for fat loss: A 30-minute run might burn 300 kcal — easily cancelled by a single snack. Diet is the primary lever for creating a meaningful calorie deficit
- Exercise is essential for maintaining fat-free mass: Without strength training during a calorie deficit, 30–50% of weight lost may come from muscle rather than fat
- NEAT matters as much as structured exercise: Non-exercise activity thermogenesis (walking around, fidgeting, standing) can account for 300–600 kcal daily — often more impactful than gym sessions
- Adaptation: The body adapts to exercise over time, reducing the calorie cost of the same activity. Progressive overload in fitness mirrors progressive overload in strength training
Common Mistakes in Calorie Burn Tracking
Trusting gym equipment readouts
Treadmill, elliptical, and bike calorie displays are notoriously inaccurate — overestimating by 20–40% on average. They often don’t account for body weight, fitness level, or actual work performed.
Eating back all exercise calories
“Eating back” burned calories is a legitimate strategy, but relies on accurate burn estimates. If your estimates are inflated, you may be eating back more than you burned — stalling or reversing fat loss progress.
Overvaluing strength training calories
Weight training burns fewer calories during the session (typically 200–400 kcal/hr) than cardio at the same duration — but the afterburn effect (EPOC) and muscle mass increase long-term metabolic rate meaningfully.
Ignoring sedentary hours
8 hours of desk work with minimal movement can drastically reduce daily NEAT. Structured workouts can’t compensate for 10+ hours of sitting. Breaking up sedentary time is as important as your gym session.
Important Notes
What this calculator does and doesn’t cover
This tool applies standard MET values to the inputs you provide. A few things worth understanding before relying on the results:
- MET values are population averages, not personalised measurements. Actual burn varies with individual fitness level, technique, terrain, and effort, typically within about 10 to 20% of the estimate shown here.
- Rounding. Figures are rounded for display, so small differences from a manual recalculation are expected.
- The fat-equivalent figure uses the 7,700 kcal/kg estimate, a widely used but simplified conversion. Real-world fat loss also depends on total daily intake, hormones, and metabolic adaptation, not just the calories burned in a single session.
- The steps-equivalent figure is a rough approximation based on typical step rates for walking and running activities; it isn’t calculated from an accelerometer or GPS data.
- Gym equipment displays often overestimate burn by 20 to 40% since they frequently don’t account for your actual body weight or fitness level. This calculator’s MET-based approach is generally more reliable for planning purposes.
- Not medical or fitness advice. For structured exercise prescriptions or if you have a health condition, consult a qualified healthcare professional or certified trainer. The WHO’s physical activity guidelines for adults provide broader context on how much activity is recommended weekly.
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