- Calorie burn depends mostly on three things: your body weight, how long you move, and how intense the activity is.
- The calculator uses MET values, a standard way of rating the intensity of physical activity.
- Gross calories include the energy you'd burn anyway at rest. Net calories only count the extra burn from the activity itself.
- Net calories are the more honest number when you're trying to lose weight, because gross burn double counts your resting metabolism.
- Every calorie burn estimate is approximate. Treat the result as a useful guide, not an exact measurement.
What Is Calorie Burn?
Calorie burn is the amount of energy your body uses over a period of time. Some of it goes to staying alive, and some goes to moving. When you walk, lift, run, or clean the house, your muscles need extra fuel, and that extra demand raises the number of calories you use.
Exercise is only one slice of your total daily burn. Most of what you burn each day comes from your resting metabolism and everyday movement. Your Total Daily Energy Expenditure (TDEE) combines all of it, while this calculator focuses on the calories used during a specific activity.
Gross vs Net Calories Burned
This is the part most calculators skip, and it makes a real difference.
| Type | What It Means | Includes Resting Burn? |
|---|---|---|
| Gross calories | Total calories your body burns during the activity | Yes |
| Net calories | Extra calories burned because of the activity | No |
Here's a simple way to think about it. Your body burns roughly 1 calorie per kilogram of body weight every hour just by existing. If you jog for 30 minutes, part of the energy used would have been burned anyway if you'd sat on the couch. Gross burn counts all of it. Net burn removes the resting portion and shows only what the workout added.
If you're using exercise to create a calorie deficit, net calories are the more useful figure. Gross calories make your workout look bigger than it really was.
What Is a MET?
MET stands for Metabolic Equivalent of Task. It's a number that describes how intense an activity is compared with sitting at rest.
- 1 MET is your resting energy use (sitting quietly)
- 3 METs means you're burning about three times your resting rate
- 8 METs means about eight times your resting rate
Light activities sit below 3 METs, moderate activities fall between 3 and 6, and vigorous activities go above 6. The values come from the Compendium of Physical Activities, a widely used research reference that has been updated over the years. Different versions of the compendium give slightly different numbers for the same activity, so small differences between calculators are normal.
How Does the Calorie Burn Calculator Work?
Step 1: Choose your activity. Pick walking, running, cycling, swimming, lifting, a sport, or a daily task. Each one has its own MET value.
Step 2: Enter your body weight. Heavier bodies use more energy to move, so weight has a direct effect on the result.
Step 3: Enter your duration. The longer you go, the more you burn.
Step 4: Get your results. The calculator shows your gross calories and your net calories for the session.
Calorie Burn Formula
The standard MET-based formulas are simple.
Gross calories burned = MET × weight in kg × duration in hours
Net calories burned = (MET − 1) × weight in kg × duration in hours
The "minus 1" removes the resting portion, which is where the gross vs net difference comes from.
Example 1: Running
A person weighing 70 kg (154 lbs) runs at 6 mph (a 10-minute mile pace) for 30 minutes. Running at that pace is roughly 9.8 METs.
Gross = 9.8 × 70 × 0.5 = 343 calories
Net = (9.8 − 1) × 70 × 0.5 = 308 calories
Example 2: Brisk Walking
A person weighing 80 kg (176 lbs) walks briskly at 3.5 mph for 1 hour. That's roughly 4.3 METs.
Gross = 4.3 × 80 × 1 = 344 calories
Net = (4.3 − 1) × 80 × 1 = 264 calories
Example 3: Cycling
A person weighing 65 kg (143 lbs) cycles at a moderate pace for 45 minutes. Moderate cycling is roughly 8.0 METs.
Gross = 8.0 × 65 × 0.75 = 390 calories
Net = (8.0 − 1) × 65 × 0.75 = about 341 calories
Calories Burned by Activity
The table below shows approximate gross calories burned in one hour for a 70 kg (154 lb) person. MET values are typical figures and can vary by source and by how hard you actually work.
| Activity | Approx. MET | Calories per Hour (70 kg) |
|---|---|---|
| Yoga (hatha) | 2.5 | 175 |
| Housework (general cleaning) | 3.3 | 231 |
| Weight training (general) | 3.5 | 245 |
| Gardening (general) | 3.8 | 266 |
| Walking, brisk (3.5 mph) | 4.3 | 301 |
| Rowing (moderate) | 4.8 | 336 |
| Swimming (moderate laps) | 6.0 | 420 |
| Weight training (vigorous) | 6.0 | 420 |
| Cycling (moderate) | 8.0 | 560 |
| Basketball (game) | 8.0 | 560 |
| Circuit training / HIIT | 8.0 | 560 |
| Running (6 mph) | 9.8 | 686 |
| Jumping rope | 11.8 | 826 |
Notice how much weight training varies. A relaxed session with long rests sits near 3.5 METs, while a hard, fast-paced session can reach 6 or higher. The label on the activity matters less than how hard you're really working.
Calories Burned by Body Weight
Weight changes the result more than most people expect. Here is the approximate gross burn for 30 minutes of three common activities.
| Body Weight | Walking (3.5 mph) | Cycling (moderate) | Running (6 mph) |
|---|---|---|---|
| 55 kg (121 lbs) | 118 | 220 | 270 |
| 70 kg (154 lbs) | 151 | 280 | 343 |
| 85 kg (187 lbs) | 183 | 340 | 417 |
| 100 kg (220 lbs) | 215 | 400 | 490 |
The same workout burns more for a heavier person because moving more mass takes more energy. This is also why your burn per workout slowly drops as you lose weight.
What Affects How Many Calories You Burn?
| Factor | How It Affects Calorie Burn |
|---|---|
| Body weight | More weight means more energy used to move |
| Intensity | Faster or harder effort raises the MET value |
| Duration | Longer sessions burn more in total |
| Fitness level | Fitter people are more efficient, so they may burn slightly less for the same task |
| Terrain and incline | Hills, stairs, and soft surfaces raise the effort |
| Technique | Good form can lower the cost of an activity, while poor form can raise it |
| Age and sex | Influence body composition and resting metabolism |
| Body composition | More muscle mass raises energy use |
| Environment | Heat, cold, and wind can change the effort |
Do Fitness Watches Get It Right?
Watches, phones, and gym machines all give calorie numbers, and they often disagree with each other and with calculators. Most of them estimate burn from heart rate, movement, and your profile, and all of those estimates have error. Gym machine readouts in particular tend to run high.
The reliable takeaway is to pick one method and use it consistently. If you compare your workouts using the same tool each time, the trend is meaningful even if the exact number isn't perfect.
What About the "Afterburn" Effect?
Intense exercise can keep your metabolism slightly elevated for a while after you finish. This is often called the afterburn effect, or EPOC (excess post-exercise oxygen consumption). It's real, but for most workouts it's small. Don't count on it to erase a big meal.
How to Use Calorie Burn for Weight Loss
Calorie burn is helpful, but it works best as part of a larger plan.
- Start with your TDEE. Use our TDEE Calculator to find your total daily burn, which already includes your typical exercise.
- Build the deficit mainly from food. It's easier to eat 300 fewer calories than to burn an extra 300 through exercise.
- Use exercise for what it does best. It protects muscle, improves heart health, lifts your mood, and supports long-term weight maintenance.
- Use net calories when estimating your workout's impact. They give a more realistic picture than gross calories.
Should You Eat Back Your Exercise Calories?
It depends on how you calculated your daily target.
If you used an activity multiplier in a TDEE calculation, your typical exercise is already built into your number. Eating back your workout calories on top of that counts the same burn twice.
If you set your target using a sedentary baseline and track workouts separately, you can add back some of your net calories. Many people eat back only about half to be safe, since calorie burn estimates tend to run high.
How Accurate Is a Calorie Burn Calculator?
MET-based estimates are useful but not exact. Your real burn can differ from the calculator by a meaningful margin because the MET value is an average for a typical person doing that activity. Your body, fitness level, and effort on the day all change the true number.
For most people, that's fine. The goal is a consistent, reasonable estimate you can use to compare workouts and plan your week, not laboratory precision.
Common Mistakes When Estimating Calorie Burn
Overestimating intensity. Casually pedaling or strolling is not the same as hard cycling or brisk walking. Choose the option that matches your real effort.
Counting rest time. If you spent 60 minutes in the gym but only 30 minutes moving, use 30.
Using gross calories for a deficit. Net calories give a more honest picture of what the workout added.
Eating back everything. Because estimates tend to run high, matching a big meal to a watch reading often erases your deficit.
Comparing tools. A watch, a treadmill, and a calculator will all show different numbers. Stick with one.
Forgetting weight changes. As you lose or gain weight, your burn per session changes. Update your weight in the calculator.
Who Should Be Careful With This Calculator?
The calculator is designed for healthy adults. If you have a heart condition, are pregnant, are recovering from an injury or illness, or are managing a medical condition, speak with a doctor before starting or increasing an exercise program. If you have a history of disordered eating, avoid tracking exercise calories without professional guidance.