What is Calorie Calculator?
This calorie calculator estimates how many calories you burn during a specific exercise session, based on your body weight, the activity you're doing, and how long you do it for. It uses the MET (Metabolic Equivalent of Task) system — a standard exercise-science measure of how intense an activity is compared to resting — so the estimate reflects the real energy cost of running, cycling, swimming, and other activities rather than a generic daily average.
Enter your weight, pick the activity from the list, and set the duration in minutes to see calories burned instantly, along with a side-by-side comparison against other activities for the same weight and time. The MET values come from the widely used Compendium of Physical Activities, giving you a scientifically grounded baseline for planning workouts and tracking your energy expenditure.
When to Use This Calculator
- Estimating how many calories you burned after a workout, run, or gym session
- Comparing sports and activities to find the best calorie burn for your time
- Building an exercise routine around a target weekly calorie expenditure
- Roughly tracking exercise calories as part of a structured weight-loss plan
- Planning training sessions when balancing cardio with strength work
- Answering questions like "how many calories does 30 minutes of swimming burn?" before starting a new activity
Steps:
- Enter your body weight.
- Select the activity you performed (running, walking, cycling, swimming, and more).
- Enter how many minutes you did the activity for.
- View the estimated calories burned, the activity's MET value, and calories burned per minute.
- Compare against other activities in the bar chart to see which burns more for the same time.
Formula
Calories burned = MET × 3.5 × weight (kg) / 200 × minutes
Each activity has its own MET value (e.g. running ≈ 9.8, walking ≈ 3.5, swimming ≈ 8.0) representing how many times more energy it uses compared to sitting still. The constant 3.5 is the resting oxygen consumption of 3.5 mL per kg of body weight per minute that defines 1 MET.
Use Cases
- Estimating calories burned after a workout or run
- Comparing which activities burn the most calories for the same amount of time
- Planning a calorie deficit by combining exercise with diet
- Tracking energy expenditure across different sports and activities
- Choosing a higher-intensity activity when your time is limited
- Setting weekly exercise targets in calories alongside your step or workout goals
Key Benefits
- Instant calorie-burn estimate for 10 common activities
- Uses the standard MET formula used in exercise science
- Compares calories burned across activities for the same weight and time
- Free, works on any device, no sign-up required
- Shows calories burned per minute alongside the session total so you can plan workouts of any length
- Saves you the math — enter weight, activity, and minutes, and get an immediate answer
Pro Tips
- Use the comparison chart to pick a higher-MET activity if your main goal is maximizing calories burned in limited time
- Combine this estimate with your daily calorie needs (TDEE) to plan an accurate calorie deficit or surplus
- Log your weight regularly — since calories burned scale with weight, updating it keeps future estimates accurate
- For weight loss, remember exercise calories burned are only part of the equation — diet still matters most
- Be honest about intensity: short, intense sessions burn more than long, slow ones, even when the MET value is the same
- Calibrate the estimate with a heart-rate monitor or fitness tracker for a few sessions, then adjust your expectations to your own body
Common Mistakes to Avoid
- Assuming MET values apply equally regardless of intensity — running fast burns more than running slowly, even though both use the same MET estimate here
- Forgetting that calorie burn scales with body weight, not just activity and time
- Treating the estimate as exact — MET-based results are averages, not a substitute for a heart-rate monitor or metabolic test
- Ignoring warm-up and cool-down time, which burns fewer calories than the main activity
- Eating back all the calories the estimate shows — most people overestimate burn and underestimate food, wiping out their deficit
Key Terms Explained
- MET (Metabolic Equivalent of Task): A measure of exercise intensity relative to resting energy use
- Calories Burned: The estimated energy expended during a specific activity and duration
- Activity Intensity: How hard an activity is, which determines its MET value
- Duration: The length of time an activity is performed, directly proportional to calories burned
- TDEE (Total Daily Energy Expenditure): The total calories you burn in a day, including basal metabolism, digestion, and activity — the reference point for planning a deficit or surplus
- Calorie Deficit: Consuming fewer calories than your body burns, the fundamental condition for weight loss
Related Concepts
- Food Calories Calculator — look up the calories in the foods you eat to plan balanced meals
- BMI Calculator — check whether your weight is in a healthy range for your height
- Ideal Weight Calculator — estimate a healthy weight range for your height
- Macro Calculator — set protein, carbohydrate, and fat targets for your goals
- Water Intake Calculator — find your daily hydration target
Example
A 70 kg person runs for 30 minutes. Running has a MET value of 9.8, so: Calories = 9.8 × 3.5 × 70 / 200 × 30 = 360.15 calories burned.
Interpreting Your Results
Enter your weight (in kilograms or pounds), pick the activity, and set the duration in minutes. The tool multiplies the activity's MET value by your weight to estimate the calories burned for the whole session, and shows the MET value and the per-minute burn alongside. The bar chart compares all 10 activities for the same weight and time so you can see which sessions deliver the most burn. Treat these as estimates based on population averages — your real burn depends on intensity, fitness, and body composition. For weight loss, use the exercise number as a bonus on top of a controlled diet rather than a license to eat more.