Calories Burned Calculator

What is a calories burned calculator?

A calories burned calculator estimates how many calories (kcal) you used during an activity from three things: the activity’s MET value, your body weight and how long you exercised. Type in an activity, your weight and the number of minutes, and the tool above returns a clear energy figure in kilocalories. It works for everyday movement like brisk walking and for harder efforts like running, cycling and swimming.

The result is the energy your body spent moving during that session — useful for tracking workouts, comparing activities or feeding a calorie plan. Because the calculation scales with both your weight and the activity’s intensity, it gives a far better personal estimate than a generic “300 calories an hour” rule of thumb.

How does the calories burned calculator work?

The tool uses the standard MET-based equation that fitness researchers and dietitians rely on:

• calories = MET × weight(kg) × hours

Each term is simple:

• MET — the metabolic equivalent of task, a number describing how intense an activity is compared with sitting still. One MET is your resting energy use; an activity at 8 METs burns roughly eight times as much energy per minute as resting.
• weight(kg) — your body mass in kilograms. If you enter pounds, the tool converts them with kg = pounds × 0.45359237.
• hours — exercise time expressed in hours. Thirty minutes is 0.5 hours, 45 minutes is 0.75 hours, and so on.

So a 70 kg person doing an 8 MET activity for one hour burns 8 × 70 × 1 = 560 kcal. Halve the time and you halve the calories; double your weight and you double them. The MET value is what separates a gentle stroll from a sprint.

The calculator stores a MET for each activity. A few common reference values it uses:

Activity	MET
Brisk walking	3.5
Cycling	7.5
Swimming	8.0
Running (6 mph)	9.8

Examples

Here are fully worked calculations that match the tool’s output exactly. Each one multiplies MET by weight in kilograms by time in hours.

Example 1 — Brisk walking, 70 kg, 30 minutes (MET 3.5)

• hours = 30 ÷ 60 = 0.5
• calories = 3.5 × 70 × 0.5 = 122.5 → about 123 kcal

Example 2 — Running at 6 mph, 70 kg, 30 minutes (MET 9.8)

• hours = 30 ÷ 60 = 0.5
• calories = 9.8 × 70 × 0.5 = 343 kcal

Example 3 — Swimming, 80 kg, 45 minutes (MET 8.0)

• hours = 45 ÷ 60 = 0.75
• calories = 8.0 × 80 × 0.75 = 480 kcal

Example 4 — Cycling, 154 lb, 60 minutes (MET 7.5)

• weight = 154 × 0.45359237 = 69.85 kg
• calories = 7.5 × 69.85 × 1 = 523.9 → about 524 kcal

Notice how intensity dominates: running for 30 minutes burns nearly three times what the same person burns walking for 30 minutes, because its MET is almost three times higher.

Calories burned reference table

The table below shows estimated calories burned in 30 minutes for two sample body weights, calculated straight from the formula. Use it as a quick sanity check, then enter your own figures above for a precise result.

Activity (MET)	60 kg, 30 min	80 kg, 30 min
Brisk walking (3.5)	105	140
Cycling (7.5)	225	300
Swimming (8.0)	240	320
Running 6 mph (9.8)	294	392

Each figure is simply MET × weight × 0.5. A heavier person burns more for the same activity and time, and a higher-MET activity burns more for the same person — exactly what the formula predicts.

Common uses

A calories burned estimate is handy in several everyday situations:

• Log a workout. Record roughly how much energy a walk, run, ride or swim cost you.
• Compare activities. See whether 30 minutes of cycling or 30 minutes of swimming better matches your goal for the day.
• Feed a calorie plan. Add exercise burn on top of maintenance calories when planning intake, or check how much a session offsets a treat.
• Set realistic targets. Work out how long you need to move to reach a calorie goal for the session.
• Stay motivated. Watching the number climb with longer or harder sessions is a simple, tangible reward.

Tips and common mistakes

• Match the MET to your real effort. “Brisk” walking is faster than a stroll; if you are dawdling, your true burn is lower than the 3.5 MET figure suggests.
• Convert time correctly. The formula uses hours, not minutes — 20 minutes is 0.333 hours, not 20. The tool does this for you, but remember it if you check by hand.
• Use your current weight. Burn scales directly with body mass, so an outdated weight skews the result.
• Do not double-count. Fitness trackers and gym machines already include this energy; adding their figure on top of the calculator’s will overstate your burn.
• Treat it as an estimate. Terrain, wind, fitness and individual metabolism all shift the real number, so do not chase the last few calories.
• Pick pounds or kilograms, not both. Enter weight in one unit; the tool converts pounds with the 0.45359237 factor when needed.

Limitations and notes

The MET method is a population estimate, not a measurement of your individual metabolism. Published MET values are averages drawn from studies, so two people of the same weight doing the same activity for the same time can burn meaningfully different amounts depending on fitness, technique, intensity and body composition. The formula also assumes a steady effort for the whole duration and does not separately account for the small extra burn after exercise or for the calories you would have used at rest anyway. Treat the result as a reasonable ballpark, accurate to within roughly 10 to 20 percent for most adults.

Health disclaimer: This calories burned calculator is provided for general information and education only. It is not medical, nutritional or fitness advice, and it is not a substitute for professional assessment. Before making decisions about your diet, exercise or health, consult a qualified healthcare professional.

For more fitness planning, try the TDEE calculator to find your total daily energy expenditure, the calorie deficit calculator to set a weight-loss target, or the steps to miles calculator to turn daily steps into distance, and browse the full fitness category for more tools.