Skip to content
Press Equals

Calories Burned Calculator

Estimate calories burned in a single session by activity type and duration. Uses MET (metabolic equivalent); enter weight, minutes, and activity (walk, run, bike, etc.).

Result

Calories burned

280cal

Calories Burned Calculator

What this calculator does

This calculator estimates calories burned during a single activity session (e.g. a run or a gym workout) based on body weight, duration, and activity type (or a custom MET value). The result is in kilocalories (kcal) for the time you entered. It uses the MET (Metabolic Equivalent of Task) approach: energy expenditure is proportional to MET × weight(kg) × time(hours).

It is useful for comparing activities, roughly balancing intake with exercise, or satisfying curiosity about a single session. Fitness enthusiasts and diet planners use it as a rough guide. The result is an estimate; real burn depends on intensity, fitness, and environment.

How to use it

  1. Choose Unit (metric or imperial) and enter your weight.
  2. Enter duration in minutes (e.g. 30 for a half-hour run).
  3. Select activity (e.g. walking, running, biking, swimming, gym). Each activity maps to a default MET value.
  4. Optionally override with a MET value if you know it (e.g. from a MET table) for finer control.
  5. Read calories burned for that session in the Result section.

All inputs are in the "Inputs" section; the result updates as you change values. The calculator converts weight to kg internally for the MET formula.

Formulas used

  • Calories burned = MET × weight(kg) × time(hours).
    With time in hours: calories ≈ MET × weight(kg) × (minutes / 60).

  • MET values are standardized multiples of resting metabolism (1 MET = resting). Examples: walking ~2–4, running ~8–12, biking ~4–8, swimming ~6–10, gym ~3–6, depending on intensity. The calculator maps each activity to a default MET; you can replace it with a custom MET for finer control.

Higher MET means higher intensity; doubling MET doubles the estimated burn for the same weight and time.

Interpretation & examples

  • The result is an estimate. Real burn depends on intensity, fitness, terrain, and environment (e.g. heat, altitude). Use for general planning, not precise accounting.
  • Example 1: 70 kg, 30 min running at MET 10 → 70 × 10 × 0.5 = 350 kcal (approx). Useful for a single session.
  • Example 2: 80 kg, 60 min walking at MET 3 → 80 × 3 × 1 = 240 kcal. Good for comparing with a run of the same duration.
  • Example 3: 65 kg, 45 min gym at MET 5 → 65 × 5 × 0.75 ≈ 244 kcal. Adjust MET up or down for light vs heavy lifting.

Do not rely on "calories burned" alone for weight loss; diet and total daily energy balance matter more. This tool is for session-level estimates only.

History & background

MET values come from exercise physiology research (e.g. compendiums by Ainsworth and others) and are used in public health and fitness to standardize activity intensity. The formula is a simplified model of energy expenditure; individual variation is large.

Limitations & safety notes

  • Not medical or dietary advice. Accuracy is limited; use for general planning only.
  • Do not rely on "calories burned" alone for weight loss; diet and total daily energy balance matter more. Overestimating burn can lead to overeating.
  • If you have health conditions or are new to exercise, consult a doctor or professional before changing activity levels. This calculator does not replace personalized advice.