Calories Burned Calculator – By Activity, Weight, and Duration

Start by picking your activity from the list. The options cover a wide range, from walking and running to swimming, cycling, weightlifting, yoga, and more. Each activity has a corresponding MET value assigned to it, which reflects how hard your body typically works during that movement.

If you don't see your exact activity, choose the one that most closely matches the intensity of what you did. For example, if you went for a casual bike ride, selecting "cycling, light effort" will give you a more accurate result than choosing "cycling, vigorous."

Next, enter your body weight. You can usually choose between pounds and kilograms depending on what you're used to. Your weight matters because heavier bodies burn more calories performing the same activity, since they require more energy to move.

Then enter the duration of your activity in minutes. Be honest here. If you took breaks during a 45-minute workout, the actual active time might be closer to 30 minutes. The calculator estimates based on continuous activity, so entering your true active time will give you a more realistic number.

Once you hit calculate, you'll see an estimated calorie burn for your session. Some calculators also show a rough weight loss equivalent, usually expressed in fractions of a pound or grams of fat. That number is based on the widely used estimate that one pound of body fat contains roughly 3,500 calories.

Keep in mind this is a gross calorie number, meaning it includes the calories your body would have burned at rest during that same time period. Your net burn, the extra calories from exercise alone, is slightly lower. For most practical purposes though, the gross number is what people use to track activity and compare workouts.

Think of the result as a useful estimate, not a precise measurement. Wearables and lab testing get closer to individual accuracy, but for everyday planning, this approach works well.

MET is a way of expressing how much energy an activity requires relative to sitting still. Sitting quietly has a MET of 1.0, which represents your baseline resting metabolic rate. An activity with a MET of 4 means your body is working four times harder than it does at rest.

Walking at a moderate pace sits around a MET of 3.5. Running at a solid effort might be 9 or 10. Vigorous swimming can reach 8 or higher. These values come from the Compendium of Physical Activities, a large reference database that researchers and health professionals use to standardize activity intensity across studies.

MET values are averages. They don't account for your fitness level, terrain, or personal efficiency, but they're the most practical tool available for estimating calorie expenditure outside a lab setting.

The formula is simple once you know the MET value:

Calories Burned = MET × Body Weight (kg) × Duration (hours)

So if you weigh 70 kg (about 154 lbs) and go for a 30-minute run with a MET of 9.8, it looks like this:

• 9.8 × 70 × 0.5 = 343 calories

If your weight is in pounds, divide by 2.205 to convert to kilograms first. The formula stays the same after that. It's a linear relationship: double your time, double your calories. Weigh more, burn more. That's the core of it.

For activities like walking, running, and cycling, distance can be a useful alternative input when you know how far you went but not exactly how long it took at a steady pace. In these cases, the calculator can estimate speed from distance and duration, or use standard pace assumptions to back into a MET value.

A general rule of thumb: running burns roughly 100 calories per mile for a 155-pound person, though that number shifts with weight and pace. Walking covers the same mile but burns less per minute because the effort is lower, even though total burn per mile is actually closer than most people expect.

Cycling is more efficient, so you cover more ground per calorie burned. A 30-minute moderate bike ride at 12 to 14 mph burns around 250 to 300 calories for an average adult. Speed and terrain matter quite a bit with cycling, so mileage-based estimates there are less precise than time-based ones.

This is the most direct factor. A heavier person burns more calories doing the exact same workout as a lighter person, because their body is moving more mass against gravity and expending more energy to do so. It's straightforward physics.

That's why calorie estimates always require your weight as an input. A 200-pound person running for 30 minutes at the same pace as a 140-pound person will burn meaningfully more calories, even though the workout looks identical from the outside.

Intensity might be the single biggest variable you can control in the moment. Pushing harder, going faster, or choosing a more demanding variation of an exercise can significantly increase your calorie burn within the same time window.

High-intensity intervals, for example, don't just burn more during the workout. They can also elevate your metabolic rate for hours afterward, a phenomenon sometimes called excess post-exercise oxygen consumption (EPOC). Low to moderate steady-state cardio doesn't produce nearly the same afterburn effect, though it's still valuable for endurance and recovery.

So if time is limited, intensity is your biggest lever.

As people age, resting metabolic rate tends to decline gradually, partly due to hormonal changes and partly due to shifts in muscle mass. This means older adults may burn slightly fewer calories at rest and, to some degree, during exercise compared to younger people at the same weight.

Fitness level cuts both ways. Highly trained athletes are more efficient at the activities they practice, meaning they sometimes burn fewer calories performing the same task as a less-trained person, because their body has adapted to do it with less effort. On the other hand, their higher muscle mass boosts resting metabolism. It balances out more than you'd think.

Muscle tissue is metabolically active, meaning it burns calories even when you're not exercising. Fat tissue burns far fewer calories at rest. Two people who weigh the same but have different body compositions will have different resting metabolic rates, sometimes by a meaningful margin.

This is one reason strength training gets recommended alongside cardio for long-term weight management. Building and preserving muscle mass keeps your baseline calorie burn higher over time, which makes it easier to maintain a calorie deficit without constantly cutting food intake.

The table below compares estimated calories burned per hour during three common activities across four different body weights, using the standard MET formula.

The gap between a 130-pound person and a 205-pound person doing the same workout can be 100 to 300+ calories per hour. Over weeks and months, that adds up. It also means that as you lose weight, your calorie burn per session will gradually decrease, which is why adjusting your routine or intake over time matters for continued progress.

The widely accepted benchmark is that one pound of body fat stores roughly 3,500 calories of energy. To lose that pound, you need to create a total deficit of 3,500 calories, either through eating less, burning more, or a combination of both.

That breaks down to a 500-calorie daily deficit to lose about one pound per week. In practice, it's not perfectly linear for everyone. Metabolic adaptation, water retention, and changes in hunger hormones can all affect how quickly weight changes show up on the scale. But the 3,500-calorie rule is a useful working model for planning purposes.

So if your workout burns 400 calories and you do that five times a week, that's 2,000 calories burned through exercise. Pair that with a modest reduction in food intake and you're getting close to that one-pound-per-week target.

Exercise alone rarely produces dramatic weight loss, and research consistently shows that diet changes tend to account for a larger share of the deficit. But exercise contributes in multiple ways beyond the direct calorie burn.

Regular physical activity helps preserve muscle mass while you're in a calorie deficit, which keeps your resting metabolism from dropping too much. It also improves insulin sensitivity, mood, sleep quality, and overall energy, all of which make it easier to stick to healthy eating habits over time.

The most effective approach combines both sides: use exercise to increase your calorie expenditure and build a stronger, more metabolically active body, while using diet to control your overall intake. Neither one works as well alone as they do together. A 300-calorie burn from a workout plus a 200-calorie reduction in daily food intake gets you to that 500-calorie daily deficit without feeling extreme on either end.