Calories Burned Calculator
A calories burned calculator estimates how much energy an activity may use based on your body weight, workout duration, and MET value, which is a standard measure of exercise intensity. It is useful when you want a quick planning estimate for walks, runs, cycling sessions, gym circuits, or other workouts without building the equation by hand. Enter your weight in kilograms, choose a MET value that matches the activity, enter the number of minutes, and the tool returns an estimated calorie total plus the implied hourly burn rate. That estimate can help with exercise logging and routine comparison, but it should be treated as a range-based planning number rather than a precise measure of what your body burned on a given day.
Quick answer
The calculator uses the standard MET method, where higher MET values represent more intense activity and therefore a higher calorie estimate per hour.
What this tells you
- •The calculator uses the standard MET method, where higher MET values represent more intense activity and therefore a higher calorie estimate per hour.
- •Body weight matters because the formula assumes a heavier body usually requires more energy to perform the same task at the same MET level.
- •Duration matters in a straight line, so doubling the workout time doubles the calorie estimate when weight and MET stay the same.
- •The result is only as good as the MET choice, which means selecting a realistic activity intensity is just as important as entering the right time.
- •Use the output to compare sessions, set rough exercise targets, or review habits over time, not to judge fitness, health status, or medical needs.
How to Use
- 11. Enter your body weight in kilograms. If you usually think in pounds, convert to kilograms first so the formula matches the tool exactly.
- 22. Choose the MET value that best fits the activity you actually performed. A relaxed walk, brisk run, and hard interval workout should not use the same MET number.
- 33. Enter the duration in minutes for the active part of the session. If your workout included long pauses, use only the time spent moving at roughly that intensity.
- 44. Click Calculate to see estimated calories burned and the matching calories-per-hour pace for the values you entered.
- 55. Compare a few realistic scenarios if you are unsure about intensity. Running the calculator with a lower and higher MET can show a more honest range than pretending one exact number fits every session.
How It Works
Formula
Calories Burned = MET x Weight (kg) x Duration (hours)This calculator follows the formula used in the source code: calories burned equals MET multiplied by body weight in kilograms multiplied by activity duration in hours. MET stands for metabolic equivalent of task, where 1 MET is roughly resting energy use and larger values represent harder effort. Duration is converted from minutes to hours by dividing by 60 before the multiplication happens. For example, 45 minutes becomes 0.75 hours. The same logic also gives the calories-per-hour figure, which is simply MET multiplied by body weight. The method assumes the activity stayed at about the same intensity for the entered time, so it is most useful for steady sessions or for average intensity across a mixed workout.
Calculation note: values are processed in the order shown above, using the current input units.
Worked Examples
Moderate cardio estimate
First convert 45 minutes to 0.75 hours. Then multiply 7 x 70 x 0.75 to get 367.5. This also means the implied hourly burn rate is 490 calories per hour at the same intensity and body weight.
Brisk walking session
Thirty minutes is 0.5 hours. Using the calculator formula, 3.5 x 82 x 0.5 = 143.5. This is a practical example of how a moderate MET value can still add up over regular daily walks.
Short run with higher intensity
Twenty minutes is one third of an hour. Multiply 8.3 x 60 x 0.3333... and the estimate comes to 166 calories when rounded to the tool's normal two-decimal logic. Short sessions can still produce meaningful calorie totals when the MET value is high.
Longer gym circuit
Ninety minutes converts to 1.5 hours. Then 5 x 95 x 1.5 = 712.5. This example shows how duration can drive the estimate upward even when the MET value is moderate rather than very high.
Vigorous jump rope interval block
Fifteen minutes is 0.25 hours. Multiply 10 x 68 x 0.25 and the estimate is 170. This kind of example is useful for comparing dense, hard efforts against longer lower-intensity sessions.
Common mistakes
- Picking a MET value that sounds impressive instead of one that matches the actual pace, terrain, and effort of the workout.
- Entering total session time when a large share of that time was spent resting, stretching, or waiting between sets.
- Using pounds as though they were kilograms, which can inflate the estimate sharply and make the result unusable.
- Comparing one calculator result to another without checking whether both tools use the same MET assumption or the same unit system.
- Treating a calorie estimate as proof of fat loss, workout quality, or daily energy needs without considering food intake, recovery, and total activity.
- Assuming interval sessions stay at one exact intensity for the whole workout even when the effort changed a lot from minute to minute.
Limitations
This calculator uses a simplified MET-based model with constant intensity across the entered time. It does not measure heart rate, oxygen use, body composition, movement efficiency, terrain, temperature, load carried, medications, or medical conditions. MET tables also represent population averages, so the same workout may produce a higher or lower real-world calorie burn for different people.
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