Calories burned calculator

Fill in your weight, pick an activity and enter the minutes (or only your steps), and the calculator shows roughly how much energy that movement used.

How to use the calories burned calculator

You need three things: your current weight, the kind of activity and how long you kept going. If you counted steps instead of minutes, you can enter those and skip the time field.

1. Choose kg or lb and type your weight as it is today. There is no need to round it or use a “goal” weight; the result is about the body you move now.
2. Pick the activity from the list. Choose the line that matches what you did most of the time. A walk that was mostly slow with a few brisk stretches is closer to “moderate” than to “brisk”.
3. Enter the minutes you were actually moving. Leave out long pauses, such as standing still at a bus stop or chatting on a bench.
4. Or enter steps. If the minutes field is empty and you give a step count, the calculator works out the walking time itself and treats it as an easy walk.
5. Press Calculate. You see the estimated calories, rounded to 5 kcal, and the minutes the estimate is based on.

Nothing you type leaves your browser. The page does not store your weight and there is no account needed.

The activities and their MET values

A MET (metabolic equivalent of task) compares an activity with sitting quietly. Sitting still is 1 MET; an activity of 4 METs uses about four times as much energy per minute. The table shows the value used for each option, with what the Compendium lists for similar activities, and the result for 30 minutes at four body weights.

Where the Compendium splits an activity into speeds or efforts, the calculator uses a value inside that range. For a moderate walk, for example, it uses 3.5, between the 3.0 listed for 2.5 mph and the 3.8 listed for 2.8 to 3.4 mph.

From steps to calories

When you enter steps, the calculator assumes a step length of about 0.7 metres and a relaxed walking speed of about 4 km/h. That turns 1,000 steps into roughly 700 metres and about 10 to 11 minutes of walking, counted at 3.0 METs.

Your own stride may be shorter or longer, and steps taken while pottering around the kitchen use less energy than steps on a purposeful walk. So treat the step result as a ballpark. If you know the actual minutes and the pace, entering those gives a better estimate.

A useful rule of thumb from step research: for many adults, a cadence of around 100 steps per minute marks the start of moderate intensity. You do not need a device to feel it; it is the pace where your breathing deepens but you can still hold a conversation.

How to read your result

The big number is the total energy your body used during the activity, including what it would have used anyway just by being alive. Scientists call this the gross energy cost.

That detail matters. If you sat on the sofa for those same 30 minutes, you would still have used about 1 MET’s worth of energy. For a person of 100 kg, half an hour at rest is around 50 kcal. So the extra energy from a 30-minute brisk walk is the calculator result minus that resting part: roughly 225 minus 50, or about 175 kcal.

Compare the result with yourself, not with others. Your 160 kcal and a friend’s 300 kcal can describe the same walk, simply because your bodies differ in size. Both of you did something good for your health.

Why do heavier bodies burn more calories?

Larger bodies use more energy for the same movement, mainly because there is more mass to carry and move. That is why the calculator multiplies the MET value by your weight.

Lifting a heavier leg, pushing off with more weight on each foot and climbing a step with more mass all take extra work. In walking studies, women living with obesity used more energy per minute than women of lower weight at the same speed. Browning and Kram also found that the cost per kilo of body mass was slightly higher in the women living with obesity.

So a slow, comfortable walk can already be a real workout for a heavier body. You do not need to go fast, run or jump to use a meaningful amount of energy. That is good news if your knees or back limit what you can do.

There is a catch in the other direction. The standard MET assumes everyone uses 3.5 ml of oxygen per kilo per minute at rest. Research such as Byrne and colleagues’ “one size does not fit all” paper shows that many people, especially those with more body fat, use less than that at rest.

The Compendium team offers “corrected METs” for research, but for everyday use the standard values are still the agreed starting point.

The result is that the calculator can be a little high for some people and a little low for others. For most readers, the error is smaller than the day-to-day differences in how hard they actually walked.

How are calories burned calculated?

The calculator uses a widely used equation that links METs, oxygen use and calories.

kcal = MET × 3.5 × body weight in kg ÷ 200 × minutes

Here, 3.5 stands for the oxygen use at rest (ml per kilo per minute). Dividing by 200 turns millilitres of oxygen into kilocalories, because one litre of oxygen releases about 5 kcal. With the number of minutes, the formula gives total kcal.

A worked example: a person of 90 kg does 40 minutes of water aerobics (5.5 METs). That is 5.5 × 3.5 × 90 ÷ 200 × 40, which comes to about 347, shown as 345 kcal.

The MET values come from the Compendium of Physical Activities, first published in 1993 and updated several times since. The latest edition, the Adult Compendium, lists 1,114 activities, most of them with measured values. It covers adults aged 19 to 59; people aged 60 and over now have a separate Older Adult Compendium, because their resting energy use tends to be lower.

The authors are clear that the Compendium describes the typical cost of an activity, not your personal cost. It is a starting point for estimates, which is exactly how this tool uses it.

How accurate is it compared with a watch or gym machine?

No consumer tool measures calories precisely. Only laboratory equipment that analyses the air you breathe comes close.

A Stanford team tested seven popular wrist devices on a varied group of adults. Heart rate readings were mostly within a few percent, but no device estimated energy use with an error under 20%.

The typical error ranged from about 27% for the best device to about 93% for the worst. Treadmills and cross-trainers at the gym often rely on similar general formulas and do not know your body.

So if your watch, the treadmill and this calculator give three different numbers, that is normal. Pick one method and use it consistently. Changes over weeks tell you far more than any single figure.

Our gym workout for weight loss guide explains how to use machine readings to compare your own sessions.

Should you eat back the calories you burned?

In most cases, no, or only partly. This is not about earning food or punishing yourself; it is about how bodies and numbers work.

There are three honest reasons:

• The number already includes resting energy. As shown above, part of the result would have been used even without the activity.
• Estimates tend to drift upwards. Watches and apps often give generous totals, and people tend to remember a walk as longer or faster than it was.
• The body compensates. After more activity, many people feel hungrier, move a bit less for the rest of the day or sleep more. A systematic review of exercise studies found that this compensation is small in short programmes and grows the longer a programme lasts.

That does not mean you should ignore hunger. After a long walk, a swim or a busy day in the garden, a planned snack or a slightly larger meal is perfectly fine. Undereating and then feeling exhausted makes it harder to keep moving.

A kinder approach is to see movement and food as two separate good habits. Eat regular, filling meals based on vegetables, pulses, wholegrains and enough protein, as in our free eating plan. Move because it helps your body and mind. You do not have to make the two cancel each other out on paper.

If you want a number for your daily food intake, our calorie calculator already builds activity into its estimate. Adding calories from this page on top of that would count your movement twice.

Limits: who should be careful

The calculator is designed for adults. It gives no medical advice, and some situations call for extra care.

• Diabetes and medicines that lower blood sugar. If you use insulin or tablets that can cause a low (hypo), more activity can drop your glucose. Ask your diabetes team how to adjust food or medicines around exercise; do not use this calculator for that.
• Heart, lung or kidney conditions. Ask your doctor which activities and intensities suit you. The Compendium itself is based on people without conditions such as heart failure or COPD that change energy use.
• Pregnancy. Energy needs change during pregnancy, and the Compendium values were not built for it. Our pregnancy weight gain calculator page explains how much gain is expected.
• Older age. If you are 60 or older, your real figure may be somewhat lower than shown, because resting energy use falls with age.
• A history of eating disorders. Counting calories burned can feed compulsive exercise or restriction. If tracking numbers makes you anxious or guilty, it is fine to skip this tool and focus on how movement makes you feel. Our page on psychological support can help you find the right care.

Stop any activity and get medical help if you feel chest pain or pressure, unusual shortness of breath, dizziness or a racing, irregular heartbeat.

What to do next: turning numbers into habits

The most useful thing about a calories burned estimate is that it shows small activities add up. Ten minutes here and fifteen minutes there make a real difference over a week.

Start with what you can repeat

Talk to your doctor first before you start a new activity plan, especially if you live with a heart, lung or kidney condition or diabetes.

Then choose one activity you can do most days without pain. For many people that is walking; for others it is chair exercise or water aerobics. Our walking guide has a step-by-step plan that starts with just a few minutes, and the Level Start videos in our free workouts are done mostly seated, with no jumping.

International guidelines suggest building up towards 150 to 300 minutes of moderate activity a week. For weight management, the American College of Sports Medicine notes that 150 minutes brings modest results and that larger amounts help more, especially for keeping weight off after losing it. Every step towards that counts.

Use the number to stay motivated, not to restrict

• Note your minutes or steps for a week. Look at the total, not at a single day.
• Try adding five minutes to a walk, or one extra short session, every week or two.
• Mix in some strength work twice a week; muscle helps your joints and blood sugar.
• Pair movement with regular meals. If you want help with food, ask for a personal eating plan.

Get support

Changing habits is easier with others. You can book a free video meeting (in English) with our team to talk through a plan that fits your body and your week. In the free Obesity Foundation Club you can save your progress and get regular encouragement.

Related calculators

Energy used in activity is one side of the picture. These tools help with the rest:

• Calorie calculator: your total daily energy needs, including activity.
• Heart rate zones calculator: how hard you are working while you move.
• Water intake calculator: how much to drink on active and hot days.