Calorie Burned Activity Calculator
A calorie burn calculator for 30+ activities using standard MET values, plus the number others omit: how much you would have burned anyway.
You would have burned about 59 kcal simply existing for those minutes — 10% of the headline figure. If you are counting this against food, the net number is the one that counts.
What Calorie Burned Activity Calculator Does
Every calculator on the first page of this search reports the same thing: gross energy expenditure. Multiply a MET value by your weight and the duration, print the number, done. What none of them mentions is that a meaningful chunk of that number is not attributable to the exercise at all: it is the energy you would have spent simply being alive for those minutes.
For a 70 kg person walking briskly for 45 minutes, the gross figure is about 209 calories. Roughly 55 of those would have happened anyway on the sofa. The genuinely extra cost of the walk is closer to 154 calories, which is 26% less than the headline. For running it narrows to about 10%, because the exercise dominates. The gentler the activity, the more misleading the gross number becomes.
This matters because most people looking up calories burned are planning to eat against the figure. A 26% overstatement is the difference between a deficit and no deficit. This page shows both numbers, and the resting share as a percentage, so the correction is visible rather than buried.
The underlying MET values come from the Compendium of Physical Activities, updated for adults in 2024. They are careful population averages, but they remain averages: the convention that one MET equals 3.5 ml of oxygen per kilogram per minute has been shown to overestimate actual resting expenditure in several groups, and no table knows anything about your fitness, technique or terrain.
How to Use Calorie Burned Activity Calculator
- Choose your preferred unit system (kg or lbs)
- Enter your body weight and exercise duration in minutes
- Select your workout activity from the dropdown
- View your total calories burned, fat oxidized in grams, and hourly burn rate
Formula Used by Calorie Burned Activity Calculator
The standard MET equation
calories = MET × 3.5 × weight(kg) ÷ 200 × minutes
- MET
- Metabolic equivalent of the activity, in multiples of resting energy cost
- 3.5
- Milliliters of oxygen per kilogram per minute at rest, by convention
- ÷ 200
- Converts oxygen consumption to kilocalories (roughly 5 kcal per liter of O₂)
Worked example
A 70 kg person walking briskly (3.8 METs) for 45 minutes
- 3.8 × 3.5 × 70 = 931
- 931 ÷ 200 = 4.655 kcal per minute
- 4.655 × 45 = 209.5 kcal
Result: 209 calories gross
Net calories — subtracting what you would have burned anyway
net = (MET − 1) × 3.5 × weight(kg) ÷ 200 × minutes
- MET − 1
- The activity cost above resting. One MET is what you burn doing nothing
Worked example
The same 45-minute brisk walk
- (3.8 − 1) = 2.8 METs above rest
- 2.8 × 3.5 × 70 ÷ 200 = 3.43 kcal per minute
- 3.43 × 45 = 154.35 kcal
Result: 154 calories genuinely extra: 55 fewer than the gross figure, a 26% reduction
Gross against net, by activity
A 70 kg person exercising for 45 minutes. The resting share is the portion of the headline number you would have burned regardless.
| Activity | MET | Gross calories | Genuinely extra | Resting share |
|---|---|---|---|---|
| Brisk walking | 3.8 | 209 | 154 | 26% |
| Swimming, freestyle laps | 7.0 | 386 | 331 | 14% |
| Running | 9.8 | 540 | 485 | 10% |
How much bodyweight changes the answer
Brisk walking (3.8 METs) for 45 minutes. Energy cost scales almost directly with the mass being moved.
| Bodyweight | Gross calories | Genuinely extra |
|---|---|---|
| 50 kg | 150 | 110 |
| 70 kg | 209 | 154 |
| 90 kg | 269 | 198 |
| 110 kg | 329 | 243 |
Two formulas in circulation, and the 5% gap between them
Both appear on calculator sites. The left column is the standard used by the Compendium; the right is a common shortcut that treats one MET as exactly 1 kcal per kg per hour.
| Activity, 70 kg, 45 min | Standard (MET × 3.5 × kg ÷ 200) | Shortcut (MET × kg × hours) | Difference |
|---|---|---|---|
| Brisk walking, 3.8 METs | 209 kcal | 200 kcal | 5.0% |
| Swimming, 7.0 METs | 386 kcal | 368 kcal | 5.0% |
| Running, 9.8 METs | 540 kcal | 515 kcal | 5.0% |
How to Read Your Result
Ten thousand steps, in calories
A common question with a reasonably firm answer. Ten thousand steps is roughly 7.7 km at a typical adult stride, taking about 90 minutes at a brisk 5 km/h. For a 70 kg person that is close to 430 calories gross, of which about 317 are genuinely extra. The step target itself has no particular scientific basis (it originated as a Japanese pedometer marketing figure in the 1960s), but as a daily activity goal it lands in a sensible place.
Why exercise disappoints as a weight-loss lever
Three effects stack against you. The gross figure overstates the extra burn, by a quarter for gentle activity. The calories are smaller than they feel: 45 minutes of brisk walking is roughly one and a half chocolate bars. And appetite often rises to meet the expenditure. None of this argues against exercising, which improves almost everything measurable about health. It argues against treating the number this calculator produces as a budget to spend at dinner.
Where MET values are least reliable
The 3.5 ml O₂/kg/min convention has been challenged in numerous studies showing it significantly overestimates actual resting energy expenditure in some populations, including people with severe obesity, coronary patients and anyone taking beta blockers. Beyond that, MET tables assign one value to an activity regardless of how well you do it: an efficient swimmer and a thrashing one are both credited the same, when the actual energy costs differ substantially.
Heart rate is not a shortcut to accuracy
Wrist devices estimate calories from heart rate, which sounds more personal than a table but introduces its own problems. Heart rate rises with heat, dehydration, caffeine, stress and poor sleep without any extra work being done, and optical wrist sensors lose accuracy exactly when intensity is highest. A chest strap helps with the measurement; it does not fix the fact that heart rate is an indirect proxy for energy expenditure rather than a measurement of it.
What the 3,500-calorie rule gets wrong
A pound of body fat does store roughly 3,500 kcal (7.7 kcal per gram), and that arithmetic is fine. The error is treating it as a fixed exchange rate over months. As you lose weight there is less of you to move and to maintain, so the same daily deficit yields progressively less loss. Predictions built on a straight-line 3,500 rule consistently overshoot what actually happens.
Limitations & Accuracy Notes
- MET values are population averages drawn from the Compendium of Physical Activities. They take no account of your fitness, movement efficiency, terrain, altitude or the weather.
- The one MET = 3.5 ml O₂/kg/min convention overestimates actual resting energy expenditure in several populations, so estimates skew high for people with severe obesity, cardiac patients and those on rate-controlling medication.
- The net calculation subtracts exactly one MET as the resting baseline. Your true resting rate depends on body composition, age and sex, so the correction is itself an approximation, though a considerably better one than ignoring the issue.
- Energy cost is assumed to scale linearly with bodyweight. In reality the relationship bends slightly, and very heavy or very light people sit further from the estimate than average-sized ones.
- These figures cannot be used to plan medically supervised weight loss, and they are not appropriate for anyone with a condition that alters energy metabolism. That is a conversation for a clinician or dietitian.
Frequently Asked Questions
What is a MET value?
MET stands for Metabolic Equivalent of Task. One MET is defined as the energy cost of sitting quietly, conventionally set at 3.5 ml of oxygen per kilogram per minute, so an activity rated at 6 METs costs roughly six times your resting rate. The reference values come from the Compendium of Physical Activities, most recently updated for adults in 2024.
Why is the "extra" figure lower than the calories burned?
Because the headline number is gross energy expenditure: it includes the calories you would have burned anyway just being alive during those minutes. For gentle activity the difference is large: about 26% of the total for brisk walking, against roughly 10% for hard running. If you are counting exercise against food eaten, the net figure is the meaningful one, and it is why exercise rarely offsets as much as people expect.
How many calories do 10,000 steps burn?
For a 70 kg person, roughly 430 calories gross, of which about 317 are genuinely extra. Ten thousand steps is around 7.7 km at a typical stride, taking about 90 minutes at a brisk 5 km/h. The figure scales almost directly with bodyweight; a 90 kg person burns close to 30% more for the same walk.
How accurate are MET-based estimates?
They are population averages and they are known to skew high for some people. The convention that one MET equals 3.5 ml O₂/kg/min has been challenged in numerous studies showing it overestimates actual resting energy expenditure in several groups, including people with severe obesity, cardiac patients and anyone taking beta blockers. MET tables also ignore fitness, technique and terrain, all of which change the real cost of an activity considerably.
Is 3,500 calories really one pound of fat?
It is a useful approximation rather than a law. A pound of body fat stores about 3,500 kcal, which works out at 7.7 kcal per gram, and that arithmetic is sound. What the rule gets wrong is treating it as a fixed exchange rate over time: as you lose weight your body becomes smaller and burns less, so a constant daily deficit produces steadily diminishing loss rather than a straight line.
How is calorie burn estimated?
From MET values (a measure of an activity's intensity relative to rest) multiplied by body weight and duration. The MET figures come from published research on averaged populations rather than from measuring you.
How accurate is it?
Roughly, at best. Efficiency, fitness, terrain, technique and body composition all change actual expenditure substantially, and estimates for the same activity can differ by a third between individuals. Use it for comparing activities, not for budgeting food precisely.
Why do fitness trackers give a higher number?
Many include your resting expenditure for that period rather than only the extra burned by exercising, which inflates the figure. They also tend to over-report for weight training and other non-steady activities.
Can I eat back the calories I burned?
Cautiously. Exercise expenditure is routinely overestimated while food intake is routinely underestimated, and eating back an inflated number is the most common reason exercise does not produce expected weight loss.
Does building muscle raise my daily burn much?
Less than commonly claimed. Muscle is more metabolically active than fat but the difference per kilogram is modest, and realistic muscle gain adds a relatively small amount to daily expenditure. The bigger benefits of resistance training are elsewhere.
Is my data stored?
No. The calculation runs in your browser.
References & Further Reading
- Herrmann SD et al. — 2024 Adult Compendium of Physical Activities — J Sport Health Sci 2024;13(1):6-12, the current reference source for the MET values used throughout this tool
- Franklin BA et al. — Using Metabolic Equivalents in Clinical Practice — Am J Cardiol 2018;121(3):382-387, which documents that 1 MET = 3.5 ml O₂/kg/min overestimates resting expenditure in obesity, coronary patients and beta-blocker users