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Calories Burned Calculator

Determine how much energy your body expends during physical activity with this calculator. By entering your weight, selecting an exercise, and specifying duration, you'll get precise calorie expenditure estimates—both total and per-hour rates. The tool also converts burned calories into potential weight loss, helping you understand the energy cost of different activities and plan realistic fitness goals.

Last updated:

Creators Bogna Szyk, MSc
Reviewers Filip Derma and Wojciech Sas
3,565 people find this calculator helpful

Understanding Calories and Energy Expenditure

A calorie represents the energy required to raise the temperature of one gram of water by one degree Celsius. In nutrition, we use kilocalories (kcal)—each kilocalorie equals 1,000 small calories or approximately 4.18 joules. Your body burns calories continuously, even at rest. This includes essential functions like maintaining heart rhythm, digesting food, and brain function (which accounts for roughly 20% of daily calorie burn). When you exercise, you add a layer of deliberate energy expenditure on top of these baseline needs.

The relationship between exercise intensity, duration, and body composition creates significant variation in calorie burn. A 90 kg cyclist and a 60 kg cyclist performing the same ride will burn different total amounts of energy simply due to the mass their muscles must move. Understanding these dynamics helps you set realistic expectations for weight loss and fitness outcomes.

The Calorie Burn Formula

The calculator uses the MET (Metabolic Equivalent of Task) system, which standardizes activity intensity. MET values represent how many times the energy cost of an activity exceeds resting metabolic rate. The formula accounts for your body weight, activity intensity, and time spent exercising:

Calories burned = (Time × MET × 3.5 × Body Weight) ÷ (200 × 60)

Calories per hour = (3600 × MET × 3.5 × Body Weight) ÷ (200 × 60)

Weight loss = Calories burned ÷ 7,700

  • Time — Duration of activity in minutes
  • MET — Metabolic Equivalent of Task—a standardized value for each activity indicating intensity (e.g., cycling at moderate pace = 9.5)
  • Body Weight — Your weight in kilograms
  • 7,700 — Approximate calories equivalent to one kilogram of fat tissue

MET Values and Activity Intensity

The MET system assigns standardized numbers to common activities, but real-world intensity varies significantly. Casual cycling with a child differs substantially from competitive criterium racing, yet both may use the same MET value in simplified calculations. This means the calculator provides a reasonable approximation rather than a precise measurement.

Different activities carry different MET values. Leisurely walking might score 3.5 MET, moderate cycling 9.5 MET, and high-intensity interval training 12+ MET. Your fitness level, terrain, weather conditions, and individual metabolism all influence actual calorie burn. The heavier you are, the more energy your body requires to move, which is why this calculator asks for your weight.

Basal Metabolic Rate and Daily Calorie Burn

Your basal metabolic rate (BMR), also called resting metabolic rate, represents the calories your body burns simply maintaining life functions—breathing, circulation, cell repair, and cognition. This is your baseline calorie expenditure before any exercise. BMR varies based on age, sex, muscle mass, and genetics. A 25-year-old athlete will have a different BMR than a sedentary 65-year-old, even at identical weights.

When calculating total daily calorie expenditure, add your BMR to exercise-related burns. Someone sitting burns roughly 86 calories per hour, while standing increases this to about 129 calories per hour. These baseline differences matter when projecting long-term weight loss, as your exercise calories represent only a portion of total daily energy use.

Practical Considerations for Accurate Results

Keep these factors in mind when using calorie burn estimates for weight loss planning.

  1. Individual variation is substantial — MET values are population averages. Your actual burn might vary by 20-30% depending on fitness level, muscle mass, age, and metabolism. Someone highly trained in an activity typically burns fewer calories doing it than a beginner, because their body has adapted for efficiency.
  2. Intensity cannot be fully captured — The calculator uses standard MET values, which don't account for fluctuations in effort during the same activity. A 7-hour cycling trip includes coasting, climbing hills, and cruising at different paces. Use the results as a reasonable estimate rather than an exact measurement.
  3. Weight loss requires both sides of the equation — Burning 500 calories through exercise is only half the story. If you simultaneously increase food intake, weight loss stalls. Sustainable results combine realistic exercise plans with mindful eating. Remember that 1 kg of fat equals approximately 7,700 calories, so meaningful weight loss requires consistent effort over weeks.
  4. Account for recovery and adaptation — Regular exercise may gradually increase your BMR as you build muscle, slightly raising total daily burn. Conversely, very low calorie diets can depress metabolism. Consistency matters more than individual workout perfection when projecting long-term results.

Frequently Asked Questions

What's the difference between calories burned sitting versus standing?

A person weighing 82 kg burns approximately 86 calories per hour while seated but increases to about 129 calories per hour standing. This 50% difference highlights why office workers and sedentary professionals accumulate lower daily expenditure. Incorporating movement breaks, using standing desks, or simply avoiding prolonged sitting contributes meaningfully to total daily calorie burn without formal exercise.

How many calories are used during sleep?

An 91 kg person burns roughly 96 calories per hour sleeping. For a recommended 7-hour night, that totals approximately 669 calories. Sleep-related burn comes from maintaining body temperature, processing information, and basic cellular functions. Contrary to common myths, sleeping more doesn't dramatically increase calorie burn, but adequate sleep supports metabolism and recovery from exercise.

How many calories do bodyweight exercises burn?

Squats performed by an 82 kg person for 10 minutes burn about 71 calories, equating to 429 calories per hour. Moderate-intensity push-ups at 91 kg yield roughly 60 calories in 10 minutes. These numbers vary with form quality, speed, and rest periods between sets. Compound movements recruiting large muscle groups typically burn more calories than isolation exercises.

Why does body weight matter for calorie burn calculations?

Heavier individuals burn more calories performing the same activity because their muscles expend additional energy moving greater mass. A 100 kg cyclist climbing a hill does more work than a 70 kg cyclist on the same route. This relationship between weight and expenditure means weight loss gradually reduces calorie burn at any given exercise level—another reason why weight loss often plateaus.

Can I use this calculator to predict exact weight loss?

The calculator provides reasonable estimates, but individual results vary. Factors like muscle gain, water retention, hormonal fluctuations, and metabolic adaptation complicate predictions. Use it to compare activities (cycling versus running) and set directional goals, but expect actual weight loss to fluctuate week-to-week. A deficit of 500 calories daily suggests roughly 0.5 kg weekly loss under ideal conditions, but this rarely happens linearly.

How does MET relate to exercise intensity?

MET (Metabolic Equivalent of Task) compares an activity's energy cost to rest. A MET value of 1 equals resting metabolism; MET 5 means five times resting energy cost. Light activities score 1–3 MET, moderate exercise 3–6 MET, and vigorous work 6+ MET. The same activity performed with different effort levels should technically use different MET values, but standardized tables may not capture your personal intensity.

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