Calorie Burn Estimator
Estimate calories burned by activity type, duration, and body weight with our free calorie burn estimator. Uses the scientifically validated MET formula with 40+ activities — from walking and running to gym workouts and yoga. Get instant results with an activity comparison chart. No signup required.
Select your activity, enter your body weight and exercise duration to instantly estimate calories burned. Uses the scientifically validated MET (Metabolic Equivalent of Task) formula. All calculations run locally in your browser — no data is sent to any server.
Calories (kcal) = MET × Weight (kg) × Duration (hours)
MET values are sourced from the Compendium of Physical Activities (Ainsworth et al., 2011), the gold standard reference used by exercise scientists and health researchers. Results are estimates — actual calorie burn varies with fitness level, age, and individual metabolism.
Why Use Our Calorie Burn Estimator?
Scientifically Accurate Calorie Estimates
Our calorie burn estimator uses the MET (Metabolic Equivalent of Task) formula — the same method used by exercise scientists and health researchers. MET values are sourced from the Compendium of Physical Activities (Ainsworth et al., 2011), the gold standard reference for calorie burn calculations.
40+ Activities Across 7 Categories
Estimate calories burned for over 40 activities including walking, running, cycling, swimming, gym workouts, sports, yoga, and daily activities. Each activity uses a validated MET value for accurate calorie burn estimation across all intensity levels.
Completely Private & Secure
All calorie burn calculations happen locally in your browser. Your body weight, activity type, and health data are never sent to any server, ensuring 100% privacy when you use our calorie burn estimator online.
No Installation Required
Use our free calorie burn estimator directly in your browser — no downloads, no apps, no account needed. Estimate calories burned from any device, anytime, with support for both metric (kg) and imperial (lbs) units.
Common Use Cases for Calorie Burn Estimator
Weight Loss Planning
Use our calorie burn estimator to calculate how many calories you burn during each workout and plan a calorie deficit for weight loss. Combine calorie burn data with your daily intake to create an effective, evidence-based weight management strategy.
Fitness Goal Tracking
Track calories burned across different workouts to measure progress toward your fitness goals. Estimate calorie burn for running, cycling, swimming, and gym sessions to understand which activities deliver the most energy expenditure for your time.
Workout Comparison
Compare calorie burn across different activities to choose the most effective workout for your goals. Our calorie burn estimator shows side-by-side comparisons so you can decide whether a 30-minute run or a 30-minute swim burns more calories for your body weight.
Sports & Athletic Training
Athletes and coaches use calorie burn estimates to plan nutrition and recovery strategies. Estimate energy expenditure during training sessions to ensure adequate fuelling for performance and to prevent under-eating during high-intensity training blocks.
Nutrition & Diet Planning
Dietitians and nutritionists use calorie burn estimators to calculate total daily energy expenditure (TDEE) for clients. Accurate calorie burn data helps create personalised meal plans that support training load, recovery, and body composition goals.
Health & Wellness Monitoring
Monitor your daily physical activity and calorie expenditure to maintain a healthy lifestyle. Use our calorie burn estimator to ensure you are meeting physical activity guidelines and burning enough calories to support long-term health and wellbeing.
Understanding Calorie Burn Estimation
What is a Calorie Burn Estimator?
A calorie burn estimator is a tool that calculates the approximate number of calories (kilocalories) your body expends during physical activity. Our calorie burn estimator uses the MET (Metabolic Equivalent of Task) formula — the scientifically validated method used by exercise physiologists, sports scientists, and health researchers worldwide. MET is a ratio that compares the energy cost of an activity to the energy cost of sitting quietly (1 MET ≈ 3.5 mL O₂/kg/min). A MET of 7 means the activity burns 7 times more energy than sitting still.
How Our Calorie Burn Estimator Works
- Select Your Activity: Choose from 40+ activities across 7 categories — walking, running, cycling, swimming, gym workouts, sports, yoga, and daily activities. Each activity has a validated MET value from the Compendium of Physical Activities.
- Enter Your Body Weight and Duration: Input your body weight (in kg or lbs) and the duration of your activity (in minutes or hours). Body weight is required because heavier individuals burn more calories performing the same activity.
- Instant Browser-Based Calculation: Click Estimate Calories and the tool instantly applies the MET formula entirely in your browser. Your health data never leaves your device.
The MET Formula Explained
- Formula: Calories (kcal) = MET × Weight (kg) × Duration (hours)
- MET Values: Sourced from the Compendium of Physical Activities (Ainsworth et al., 2011) — the gold standard reference used by the American College of Sports Medicine (ACSM).
- Intensity Levels:Sedentary (MET < 2), Light (2–3.5), Moderate (3.5–6), Vigorous (6–9), Very Vigorous (MET ≥ 9).
- Accuracy: The MET formula provides a reliable population-level estimate. Individual results vary based on fitness level, age, sex, and metabolic rate.
Important Limitations of Calorie Burn Estimates
While our calorie burn estimator provides scientifically grounded estimates, all calorie calculations are approximations. Actual calorie expenditure varies based on individual factors including age, sex, fitness level, body composition, ambient temperature, and exercise efficiency. The MET formula does not account for the afterburn effect (EPOC — excess post-exercise oxygen consumption), which can increase total calorie burn after high-intensity exercise. For precise calorie measurement, laboratory-grade metabolic testing (indirect calorimetry) is required. Use our calorie burn estimator as a planning and tracking guide, and consult a registered dietitian or exercise physiologist for personalised advice.
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Frequently Asked Questions About Calorie Burn Estimator
A calorie burn estimator is a tool that calculates the approximate number of kilocalories your body burns during physical activity. Our calorie burn estimator uses the MET (Metabolic Equivalent of Task) formula with validated activity values from the Compendium of Physical Activities to provide scientifically grounded estimates.
Our calorie burn estimator uses the MET formula, which is the standard method used by exercise scientists and health researchers. It provides reliable population-level estimates, but individual results vary based on age, sex, fitness level, body composition, and metabolic rate. For precise measurement, laboratory metabolic testing is required. Use the estimates as a planning guide rather than an exact figure.
MET (Metabolic Equivalent of Task) is a ratio that compares the energy cost of an activity to the energy cost of sitting quietly. A MET of 1 equals resting metabolism (~1 kcal/kg/hour). A MET of 7 means the activity burns 7 times more energy than rest. MET values are the scientifically validated basis for calorie burn estimation and are used by the American College of Sports Medicine (ACSM).
Heavier individuals burn more calories performing the same activity because they must move more mass against gravity and require more energy to sustain movement. The MET formula directly multiplies by body weight in kilograms, so a 90 kg person burns approximately 50% more calories than a 60 kg person doing the same activity for the same duration.
Our calorie burn estimator supports 40+ activities across 7 categories: Walking & Running (9 activities), Cycling (6 activities), Swimming & Water (4 activities), Gym & Strength (8 activities), Sports (10 activities), Yoga & Flexibility (5 activities), and Daily Activities (6 activities). Each activity uses a validated MET value from the Compendium of Physical Activities.
Yes! Our calorie burn estimator supports both metric (kilograms) and imperial (pounds) for body weight, and both minutes and hours for duration. The tool automatically converts your inputs to the correct units before applying the MET formula, so you always get accurate results regardless of which units you prefer.
Absolutely. All calorie burn calculations happen entirely in your browser using JavaScript. Your body weight, activity type, and health information are never transmitted to any server. Your data stays completely private on your device every time you use our calorie burn estimator online.
Yes! Our calorie burn estimator is 100% free with no signup, no account, and no usage limits. Estimate calories burned for any activity, weight, and duration as many times as you need — completely free, forever.
The MET formula calculates calories burned during the activity itself and does not include EPOC (Excess Post-Exercise Oxygen Consumption), the additional calories burned after high-intensity exercise as your body recovers. For high-intensity activities like HIIT or heavy strength training, actual total calorie burn may be 6–15% higher than the estimate shown due to the afterburn effect.