Workout Calorie Burn Calculator – Estimate Calories Burned
Estimate the calories you may burn during exercise using your body weight, workout duration, and activity intensity.
How this calculator helps
Estimate the calories you may burn during exercise using your body weight, workout duration, and activity intensity. It gives a quick estimate so you can compare scenarios and plan with clearer expectations.
Formula: Calories burned = MET × 3.5 × weight (kg) × minutes ÷ 200.
Assumptions: MET values vary by activity intensity and each person’s body composition, so this is a practical estimate rather than a precise metabolic reading.
Worked example: A 160 lb person doing a 30-minute brisk walk with a MET value of 4.3 burns about 165 calories.
- Inputs: Use your own values for the fields below.
- Adjustments: Compare a few activities at the same duration to see which burns more.
- Output: Use the result to plan workouts, not as a precise lab-grade measurement.
What the result means
Calorie burn estimates are typically based on MET (metabolic equivalent) values assigned to different activities, then scaled by your body weight and workout duration. Heavier individuals burn more total calories doing the same activity, since moving more body mass requires more energy.
Intensity and fitness level both shift the real number: someone new to an activity often works harder, and burns more calories, at what looks like a lower intensity than someone experienced at the same activity, since efficiency improves with practice.
These estimates are useful for comparing activities and planning workouts, but wearable trackers and lab-based testing will always be more precise than a formula-based estimate, since they can account for your individual heart rate response.
Related calculators
Calorie maintenance, Protein intake, and Steps to distance are closely related to this estimate.
Frequently asked questions
- Why do heavier people burn more calories doing the same workout? Moving more body mass takes more energy, so weight is a direct input into most MET-based formulas.
- Does fitness level change the result? Yes, beginners often work harder, and burn more, at what looks like the same intensity as someone more experienced.
- Is a heart rate monitor more accurate? Generally yes, since it reflects your individual response rather than a population-average formula.
Creator & reviewers
Creator persona
- Quinn ParkerWellness & nutrition estimates
Reviewer personas
- Casey RowanUnits, conversions & measurement
- Sage MitchellClarity & usability review