Calories Burned Calculator

What does "calories burned" mean?

It is the energy your body uses during an activity. Your body burns calories constantly — asleep, sitting, reading this — and exercise adds to that baseline because working muscles need more fuel.

The figure this calculator gives is the total for the session, which includes energy you would have used anyway during that time. That distinction matters more than it sounds: a 60-minute walk does not add its whole total to your day, because you would have burned something in that hour regardless.

How this calculator works

It uses MET values — Metabolic Equivalent of Task — from the Compendium of Physical Activities, the reference researchers use for this.

One MET is resting energy use. An activity rated 8 MET uses roughly eight times the energy of sitting still, so the rating is a direct measure of how hard something is.

calories = MET × body weight (kg) × duration (hours)

Speeds and intensities are stored as separate entries with their own measured MET, rather than one generic value scaled up and down. Running at 8 km/h is 8.3 and at 11 km/h is 11.0 — two different measurements, and inventing the second from the first would be making up data that already exists.

Why heavier people burn more

Moving a larger body takes more energy, so two people doing the identical workout burn different amounts. Body weight is one of only two things you control in the equation, and it is why generic "calories burned running" figures are close to useless without one.

It also means calorie burn falls slightly as you lose weight, doing the same session — one of several reasons progress slows over a long period rather than continuing in a straight line.

What else affects the number

• Duration — the most straightforward factor.
• Intensity — running burns more per minute than walking because the body is working harder.
• Fitness — fitter people are often more efficient, so they may burn slightly less doing the same thing.
• Terrain — hills and soft ground raise the cost considerably.
• Temperature — heat and cold both add to it.
• Movement efficiency — technique varies, and so does the energy it takes.

Calories burned by popular activities

Estimates for a 75kg adult, generated from the same MET values the calculator uses:

Scale these to your own weight rather than reading them as fixed figures — someone at 95kg will burn roughly a quarter more for every row.

Activity notes

Walking

The easiest way to raise daily expenditure, mostly because it accumulates without feeling like exercise. Pace, incline and distance all lift the figure — brisk walking is close to double the rate of a slow stroll.

Running

Among the highest rates per minute available, which is why short runs compare well with long sessions of gentler activity. Speed, hills and body weight all matter.

Cycling

Enormously dependent on speed and terrain: leisure cycling sits around 4 MET, road cycling above 25 km/h reaches 12. Almost nothing else in this list has that spread.

Swimming

Full-body, and stroke-dependent. Breaststroke and freestyle at a moderate pace sit around 5–6 MET; butterfly is one of the most demanding activities in the entire Compendium at 13.8.

HIIT

High expenditure in a short window. There is a modest rise in metabolic rate afterwards, but it is commonly overstated in fitness marketing — typically a small fraction of the session itself, not a licence for the rest of the day.

Weight training

Lower per minute than continuous cardio because of the rest between sets. Its real contribution to body composition is preserving muscle while you lose fat, which the calorie figure does not capture at all.

Can you lose weight through exercise alone?

You can, but it is harder than it looks, and the arithmetic is worth seeing plainly.

A 250-calorie chocolate bar takes roughly 25 to 40 minutes of running to offset, depending on your weight and pace. Eating it slightly less often takes no minutes at all.

That is not an argument against exercise, which is worth doing for fitness, health, mood and keeping muscle while losing fat. It is an argument against treating it as an eraser. For most people diet is the larger lever, and the two work far better as separate habits than as a ledger you try to balance daily.

The calorie deficit calculator sets the intake side, and the TDEE calculator already folds your usual training into a daily figure.

Why estimates disagree

Your watch, the gym machine, this page and a laboratory will all give different answers for the same session.

Each estimates differently: MET tables use population averages, wearables infer from heart rate and movement, machines often assume a default body weight, and only indirect calorimetry actually measures gas exchange. Wearables and cardio machines both tend to overstate, sometimes substantially.

Pick one method and watch the trend rather than comparing across them. And be sceptical of any single figure precise enough to look authoritative — none of them are.

Should you eat back exercise calories?

Usually not in full.

If your daily target came from a calculator that asked about your activity level, your regular training is already inside it — adding it again counts the same exercise twice. Combine that with estimates that run high, and eating back the whole figure can close a deficit entirely without anyone noticing.

Genuinely unusual days are different: a long ride, a race or a full day on the hills is not covered by "moderately active", and eating more then is sensible.

Important information

These are general estimates for healthy adults and are not a medical assessment. Calorie expenditure varies considerably between individuals. Speak with a GP before starting a new exercise programme if you have a health condition, are pregnant, or have been inactive for a long period. If tracking calories burned is affecting your relationship with food or exercise, consider stepping away from the numbers and speaking to a healthcare professional.