This free calories burned calculator works for almost any activity — walking, running, cycling, swimming, lifting, yoga, HIIT, dancing and more — using the same MET-based formula that exercise physiologists and clinical researchers rely on. Pick an activity, enter your body weight, set the duration, and the tool instantly estimates total calories burned, calories per minute, calories per hour, and the underlying MET value driving the math.
Most online calorie calculators quietly hardcode one activity and call it a day. This one is built to be generic on purpose: swap the activity dropdown and the entire calculation updates using activity-specific research data, so you can compare a 30-minute yoga class against a 30-minute run without opening two different tools. Arb Digital built this alongside several other free fitness calculators to help you plan workouts and understand your numbers without a subscription or a login.
What This Calories Burned Calculator Does
The calculator converts three inputs — activity, body weight, and duration — into an estimate of energy expenditure. Behind the scenes it uses the Metabolic Equivalent of Task (MET) system, a standardized way of ranking how metabolically demanding an activity is relative to sitting still. Every activity in the dropdown carries a MET value sourced from the Compendium of Physical Activities, the reference dataset researchers use to standardize energy-expenditure studies. Because the formula is the same regardless of activity, the tool works whether you're logging a walk, a swim, or a weightlifting session, and it scales automatically to your own body weight rather than assuming a generic 155 lb reference person.
How to Use It
- Choose your activity. Pick the closest match from the dropdown. Each option lists its MET value so you can see exactly how demanding it is.
- Enter your body weight. Toggle between pounds and kilograms using the unit selector next to the weight field.
- Set your duration. Enter how many minutes you did (or plan to do) the activity.
- Read your results. The headline number is total calories burned; the grid below breaks it down by minute, by hour, and shows the MET value used.
Because every field recalculates live, you can quickly compare scenarios — for example, checking whether 20 minutes of HIIT burns more than 45 minutes of brisk walking for your specific body weight.
The Formula: MET × Weight × Time
The underlying formula is: calories burned = MET × body weight in kilograms × duration in hours. A MET of 1.0 represents your resting metabolic rate — roughly the energy you burn sitting quietly. An activity with a MET of 8 burns approximately eight times as much energy per minute as sitting still. This method is widely used in exercise science and is described in detail by the CDC, which explains how MET values are used to classify activity intensity for public-health guidance. The Compendium of Physical Activities, maintained by exercise-science researchers, is the standard source for the MET values used in tools like this one and in most fitness trackers and clinical studies.
MET Values: The Universal Currency of Exercise Intensity
MET stands for Metabolic Equivalent of Task, and it is genuinely the cleanest way to compare wildly different activities on one scale. Sitting quietly is defined as 1 MET. Light housework runs around 2–3 METs. Brisk walking sits around 5 METs. Running or vigorous cycling can push past 10 METs. Because the scale is a multiple of resting energy use, a 10-MET activity burns roughly ten times what sitting burns, minute for minute — regardless of whether that activity is running, swimming, or shoveling snow. This is why the same calculator can handle 20+ completely different activities: swap the MET value and the formula does the rest. The National Institutes of Health has published research on how MET-based activity measurement is used to study the health benefits of exercise across large populations, which is part of why it has become the common language of exercise intensity.
Why Body Weight Changes the Number So Much
Two people doing the identical workout for the identical duration will burn different amounts of energy if their body weights differ, because moving more mass takes more work. A 200 lb person walking briskly for 30 minutes burns noticeably more than a 130 lb person doing the exact same walk at the exact same pace. This isn't a flaw in the math — it's physics. It's also why generic "calories burned per activity" charts that assume a single reference weight (often 155 lb) are only a rough approximation for anyone who doesn't weigh close to that. Entering your own weight is the single biggest accuracy improvement you can make over a generic chart, which is exactly why this calculator asks for it up front rather than assuming a fixed number.
Why Your Fitness Tracker Doesn't Match This Number
If you've ever compared a smartwatch's calorie estimate to a MET-based calculation, you've probably noticed they rarely agree — and that's expected, not a bug. Independent validation studies on consumer wearables have found calorie-burn estimates can be off by anywhere from roughly 20% to over 90% depending on the device, the activity, and how well it was calibrated to your body. Wrist-based heart-rate sensors, in particular, struggle with high-intensity or upper-body-dominant movements like weightlifting or rowing, where MET-based formulas tend to hold up better because they're not trying to infer effort from a pulse signal alone. The honest takeaway: treat every calorie-burn number you see — including this one — as a useful ballpark for planning and comparison, not a lab-grade measurement. Consistency in how you track (using the same method over time) matters more than chasing perfect precision from any single tool.
Calories Burned Doesn't Replace a Good Diet
It's tempting to use a big workout as license for a big meal, but the math rarely works in your favor. A 30-minute run might burn 300–400 calories for an average adult — roughly the calorie count of a single fast-food side item or a couple of sugary drinks. Exercise brings real cardiovascular, mental-health, and metabolic benefits well beyond the calorie count, but you genuinely cannot out-train a calorie-dense diet through exercise alone for most people. Use this calculator to understand your activity's energy cost, and pair it with our TDEE calculator to see your full daily energy picture, including the calories you burn just existing.
Arb Digital builds fast, high-converting websites and content for businesses that care about doing things properly — the same attention to detail that went into this calculator. Explore our other free calculators below.
All Free Tools Contact UsCommon Mistakes to Avoid
- Picking the wrong intensity band. "Walking" and "brisk walking" have very different MET values — choose the option that actually matches your pace, not the one that sounds closest.
- Forgetting to switch units. If you enter your weight in kilograms but leave the toggle on pounds (or vice versa), your result will be significantly off. Double-check the unit selector before reading the result.
- Treating the number as exact. MET values are population averages from research studies, not a measurement of your individual metabolism, fitness level, or effort on a given day.
- Ignoring duration accuracy. Rounding a 42-minute workout to "45 minutes" seems trivial but compounds if you're tracking totals across a week.
- Comparing wearable numbers directly. Your fitness tracker and this calculator use different methods and will rarely match exactly — that's normal, not an error in either one.
Related Free Tools From Arb Digital
If you want activity-specific detail with speed and pace nuance rather than a generic dropdown, try the walking calorie calculator, the running calorie calculator, or the cycling calorie calculator. Runners planning splits should also check the running pace calculator, and for your full daily energy picture — not just workouts — see the calorie TDEE calculator. Browse everything in our free online tools hub.
Related tool: Steps to Calories Calculator.
Frequently Asked Questions
It's a solid estimate, not a lab measurement. It uses standardized MET values from the Compendium of Physical Activities combined with your body weight, which is the same general method used in most fitness apps and many clinical studies. Individual metabolism, effort level, fitness, and terrain can all shift the real number up or down.
MET stands for Metabolic Equivalent of Task. It measures how many times more energy an activity uses compared to resting quietly, which is defined as 1 MET. A 10-MET activity uses roughly ten times the energy of sitting still, minute for minute.
Wearables estimate calorie burn from heart rate, motion sensors, and proprietary algorithms, which validation studies have shown can be off by 20% to over 90% depending on the device and activity. MET-based formulas like this one use a different, research-standardized method, so some difference between the two is completely normal.
Yes, significantly. Moving a heavier body takes more energy, so for the identical activity and duration, a heavier person burns more calories than a lighter person. This is why the calculator asks for your specific weight rather than assuming a fixed reference body.
Pick the closest match by intensity. If your activity feels similar in effort to "moderate cycling" but isn't listed by name, using that MET value will give you a reasonable estimate. The Compendium of Physical Activities catalogs hundreds of activities if you want to look up a more precise MET value.
For most people trying to lose weight, no — or only partially. Calorie-burn estimates (from this tool or any wearable) tend to run optimistic, and eating back 100% of an estimated burn often erases the deficit that drives weight loss. Treat exercise calories as a bonus toward overall activity, not a credit to spend at dinner.
This tool provides general estimates for educational purposes only and is not medical advice. Calorie burn varies by individual — consult a doctor before starting a new exercise program.
