Calorie Burn Goal Time Calculator
Calculate how long to burn your target calories
Enter your target calories, activity type, and body weight to see exactly how long you need to exercise.
Understanding calorie burn rates across different activities
When people set exercise goals, they often focus on calories burned as a measurable target. Whether the aim is to offset a meal, create a weekly calorie deficit, or simply understand the return on exercise effort, knowing how long a particular activity needs to last to hit a specific calorie target is genuinely useful information. This calculator converts a target calorie number into a time estimate for a range of common activities, adjusted for your body weight.
The calculation is based on MET values, which stands for Metabolic Equivalent of Task. MET is a standardised way of expressing the energy cost of physical activities relative to rest. Sitting still has a MET of roughly 1.0. Walking at a moderate pace is around 3.5. Running at a moderate effort reaches approximately 9.8. HIIT, which involves repeated high-intensity bursts, sits near 10.0. These figures come from the Compendium of Physical Activities, a widely cited database developed by researchers at Arizona State University and used across exercise science research globally.
The formula converts MET into calories per minute using your body weight: calories per minute equals MET multiplied by weight in kilograms multiplied by 3.5, divided by 200. Body weight matters because a heavier person expends more energy performing the same movement. A 90 kg person burns meaningfully more calories per minute of running than a 60 kg person running at the same pace, because more mass requires more muscular effort to propel it.
Dividing your target calorie number by the calories-per-minute figure gives the total minutes needed. The calculator then converts this to hours and minutes for readability, and also provides a comparison to common food items so you can contextualise the number. Burning 300 calories is roughly equivalent to one slice of pizza; 500 calories is approximately two chocolate bars. These comparisons are not meant to encourage treating food as a reward or punishment for exercise, but simply to make the number more tangible.
Why body weight changes the result significantly
The effect of body weight on calorie burn is often underestimated. For a walking workout at MET 3.5, a 60 kg person burns roughly 6.1 calories per minute, while an 80 kg person burns around 8.1 calories per minute. Over a 45-minute walk, that difference amounts to about 90 calories. Over a week of daily walks, it accumulates to more than 600 calories. This is why population-level averages printed on cardio machines or fitness apps can be significantly off for any individual. Machines that ask for your weight before displaying calorie output are closer to accurate; those that do not are showing a rough average that may not apply to you.
Running and HIIT produce the highest calorie burn per minute of the activities in this calculator, which reflects their greater cardiovascular demand. However, higher intensity also means greater fatigue and longer recovery time, shorter sessions on average, and higher injury risk for people who are not yet conditioned to that level. A longer moderate-intensity session can burn a comparable total number of calories to a shorter high-intensity session, while being more accessible for people at earlier stages of fitness.
Practical uses for this calculator
This tool works well for pre-planning exercise sessions with a specific calorie target in mind. It also helps compare activities side by side. If you have 40 minutes to exercise and want to know whether walking or cycling will burn more calories in that window for your body weight, you can run both calculations and compare the outputs. The result will depend on your weight and which MET value applies.
It is worth noting that calorie burn during exercise is only one part of total daily energy expenditure. Non-exercise activity thermogenesis, which covers all the movement you do outside formal exercise, and the thermic effect of food also contribute meaningfully to daily calorie output. Exercise-based calorie calculations are useful reference points, but they are not a complete picture of energy balance.
Results from this calculator are estimates. Actual calorie burn depends on factors including aerobic fitness, exercise efficiency, environmental temperature, terrain, and individual metabolic variation. Use the output as a planning guide rather than a precise measurement.
