How Many Calories Do You Really Burn? (Exercise Calculator)

If you've ever stepped off a treadmill dripping in sweat, you've probably immediately looked at the screen to see exactly how many calories you just burned. It is incredibly satisfying to see that number climb.

But here is a frustrating secret of the fitness industry: most gym machines are lying to you. Treadmills, ellipticals, and stationary bikes usually over-estimate your calorie burn by a massive margin because they use a generic, "one-size-fits-all" math formula.

If you really want to know "how many calories do I burn walking?" or cycling, or playing basketball, you need to use your exact body weight and the specific intensity of your exercise. In this quick guide, we will explain how exercise calories are actually calculated, what MET values are, and how to find your real numbers using our free Calories Burned Calculator.

The Science of Burning Calories: What are METs?

To figure out exactly how much energy you burn during a workout, scientists use something called a Metabolic Equivalent of Task, or a MET value. Think of a MET as a multiplier for your metabolism.

When you are just sitting on the couch doing absolutely nothing, your body is burning energy at 1 MET. Everything else you do is a multiple of that resting rate. For example:

• Walking slowly might be around 2.0 METs (meaning you burn twice as much energy as sitting).
• Brisk walking jumps up to around 3.5 METs.
• Vigorous swimming is a massive 10.0 METs.

Because every single body is different, your exact calorie burn depends entirely on how heavy you are. A 200-pound person is going to burn significantly more calories running a mile than a 130-pound person, simply because their body requires more energy to move that weight.

How to Calculate Your True Burn

The mathematical formula for finding your exact calorie burn looks like this: Calories = MET value × your weight in kilograms × time in hours.

Unless you really love math, you probably don't want to calculate that on a notepad every time you leave the gym. That is why we built our Calories Burned Calculator.

Instead of giving you a generic estimate, our tool uses precise clinical MET values. You simply type in your current weight, select the exact activity you did (from yoga to soccer to swimming), choose how intense the workout was, and tell us how long you exercised.

The calculator instantly does the complex math for you. It even provides a visual chart showing you exactly how many calories you would have burned if you kept going for 30, 45, or 60 minutes!

Frequently Asked Questions (FAQs)

Can I eat back the calories I burn from exercise?

If your goal is to lose weight, you generally should not eat back your exercise calories. It is very easy to overestimate how much you burned, and very easy to underestimate how much you eat. It's much safer to use a Calorie Calculator to set a daily food target, and treat any calories burned during exercise as a "bonus" for your weight loss.

Is walking or running better for burning calories?

Minute for minute, running burns significantly more calories because it has a much higher MET value. However, running is exhausting. You might only be able to run for 15 minutes, but you could easily walk for an hour. Often, a long brisk walk will end up burning just as many total calories as a short run, while being much gentler on your joints!

Do I burn calories after my workout is over?

Yes! This is called the "afterburn effect" (or EPOC). If you do a very intense workout like heavy weightlifting or sprinting, your body will actually continue to burn extra calories for hours after you leave the gym as it tries to recover and repair your muscles.

Stop Guessing, Start Tracking

The next time you finish a great workout, ignore the flashy numbers on the treadmill screen. Get the real data based on your specific body weight and effort level.

Check out our Free Calories Burned Calculator to find your true numbers today!