How Calories Burned Is Calculated
Our calculator uses MET values — Metabolic Equivalents of Task — which are scientifically validated measures of how much energy each activity requires relative to sitting at rest. MET values are established by the Compendium of Physical Activities and are the gold standard for estimating exercise calorie expenditure.
Calories Burned = MET × Weight (kg) × Duration (hours)
Where MET = Metabolic Equivalent of Task
Examples for a 70 kg person:
Walking moderate (MET 3.5) for 60 min:
3.5 × 70 × 1.0 = 245 calories
Running moderate (MET 9.0) for 30 min:
9.0 × 70 × 0.5 = 315 calories
Cycling vigorous (MET 10.0) for 45 min:
10.0 × 70 × 0.75 = 525 calories
Swimming laps (MET 8.0) for 30 min:
8.0 × 70 × 0.5 = 280 calories
Why Heavier People Burn More Calories
The MET formula includes body weight because more mass requires more energy to move. A 90 kg person burns approximately 30 percent more calories than a 70 kg person doing the exact same activity for the same duration. This is why weight loss often accelerates initially — heavier people burn more calories with every movement and their deficit grows faster as they become more active.
Exercise vs Diet for Weight Loss
A common misconception is that exercise alone is sufficient for weight loss. In reality a 30 minute run burns approximately 300 calories — equivalent to a small meal. While exercise is essential for health, fitness and metabolic rate the most effective weight loss strategy combines moderate calorie reduction with consistent exercise. Use our TDEE Calculator to find your maintenance calories and create the right combined deficit.
How Many Calories to Burn Per Day to Lose Weight
One kilogram of body fat contains approximately 7,700 calories. To lose 0.5 kg per week you need a total weekly deficit of 3,850 calories — about 550 per day from a combination of eating less and exercising more. If you exercise 300 calories daily you only need to reduce food intake by 250 calories — a very sustainable approach that preserves muscle while losing fat.
⚠️ Health Disclaimer: This calories burned calculator provides estimates for informational and educational purposes only using MET values from the Compendium of Physical Activities. Actual calorie burn varies based on individual fitness level, metabolism, body composition and environmental factors. Results have approximately 15-20 percent margin of error. Always consult a healthcare professional before starting a new exercise program.
Frequently Asked Questions
How many calories do I burn walking for 30 minutes? +
A 70 kg person walking at moderate pace burns approximately 150-175 calories in 30 minutes. Heavier people burn more for the same activity because more energy is required to move greater body mass. Walking uphill or at faster pace increases calorie burn significantly. Use our calculator above with your exact weight and duration for a precise result.
How many calories does running burn per mile? +
Running burns approximately 80-100 calories per mile for an average 70 kg person. The exact amount depends on your weight, running speed and terrain. Running faster burns more calories per minute but about the same per mile. A heavier person burns more calories per mile than a lighter person covering the same distance because more energy is needed to move greater mass.
What is MET value and how is it used to calculate calories burned? +
MET stands for Metabolic Equivalent of Task — a scientifically validated measure of how much energy an activity requires relative to sitting at rest. Sitting equals MET 1. Walking is MET 3.5. Running is MET 9. The formula is: Calories = MET × weight in kg × duration in hours. This method is used by researchers, sports scientists and fitness professionals worldwide and is the most accurate way to estimate calorie burn without laboratory equipment.
Which exercise burns the most calories? +
High intensity activities burn the most calories per hour. Running at fast pace burns 600-900 calories per hour for an average person. Jump rope, rowing and vigorous cycling also burn 500-800 calories per hour. However the best calorie burning exercise is whichever one you enjoy enough to do consistently over months and years. A moderate 60 minute walk done daily beats an intense 30 minute session done occasionally.
How accurate are calorie burn estimates? +
MET-based calorie estimates have approximately 15-20 percent margin of error. Individual factors like fitness level, muscle mass, metabolic efficiency and environmental conditions all affect actual calorie burn. Fitness trackers and smartwatches have similar or slightly higher error rates. These estimates are excellent for general planning and tracking relative effort but should not be used as exact measurements for medical purposes.
Does exercise intensity affect how many calories I burn? +
Yes significantly. Higher intensity exercise burns more calories per minute. Running at 10 km per hour burns roughly double the calories per minute compared to walking at 5 km per hour. However lower intensity exercise can often be sustained for much longer periods. A 60 minute moderate walk may burn similar total calories to a 30 minute run. For weight loss total calorie burn over time matters more than the intensity of any single session.
How many calories do I need to burn to lose 1 kg of fat? +
One kilogram of body fat contains approximately 7,700 calories. To lose 1 kg of fat you need to create a total deficit of 7,700 calories through a combination of eating less and exercising more. At a daily deficit of 500 calories this takes approximately 15 days. Exercise alone is rarely sufficient for significant weight loss — the most effective approach combines moderate calorie reduction with increased daily activity for a sustainable combined deficit.