About the Calories Burned Calculator
The Calories Burned Calculator uses the formula kcal = MET × body weight (kg) × duration (hours), drawing MET values from the Compendium of Physical Activities — a peer-reviewed database maintained by exercise scientists with 800+ entries. The bundled list covers the 50 most-searched activities (running at various paces, cycling, swimming, weight training, hiking, yard work, household tasks) with intensity modifiers for honest effort calibration.
It is built for fitness trackers who don’t trust their wrist device’s burn number (and shouldn’t entirely — they’re typically 20–30% off), runners and lifters logging precise energy expenditure into TDEE math, sports nutritionists fueling clients, and anyone wondering whether their hour of hiking just earned them a beer or a meal (probably both). Food-equivalent and walking-distance comparisons translate the calorie number into intuitive units.
All calculations run locally in JavaScript. Body weight, activity selection, duration, and intensity inputs never leave your device. The page makes no network call after first load. MET values for 50+ activities are bundled into the JavaScript on initial load.
MET values describe a population average; individual variation is real (efficient movers burn less than the rated MET; very fit cardio specialists burn less doing familiar activities than untrained beginners doing the same activity, despite the trained athlete working harder). As fitness improves, expect a given activity to burn 10–20% less than it did when untrained — progressive overload (more intensity, more duration) is what keeps the burn going. Don’t use this number to license over-eating; the “earned” calories are smaller than most people assume.
Multi-Activity Workout Builder
Stack multiple activities into a single workout and see cumulative calorie totals.
Weekly Activity Log
Track 7 days of workouts with cumulative burn totals and daily averages.
Activity Comparison Table
All 50+ activities ranked by calories burned per hour at your current weight.
| # | Activity | MET | Cal/Hour |
|---|
How to Use the Calories Burned Calculator
Enter your body weight, pick an activity from the dropdown, and adjust the duration — results update instantly as you go. Toggle between pounds and kilograms with the unit chip, and use the intensity modifier to fine-tune your estimate based on how hard you actually worked.
What Are MET Values?
MET stands for Metabolic Equivalent of Task. One MET equals the energy you burn sitting quietly — about 1 kilocalorie per kilogram of body weight per hour. An activity rated at 8 METs burns roughly eight times the energy of sitting still. The values in this calculator are drawn from the Compendium of Physical Activities, a research-backed database maintained by exercise scientists.
How the Calorie Formula Works
The standard equation is straightforward: Calories = MET × weight in kg × duration in hours × intensity modifier. A 70 kg person running at 6 mph (9.8 METs) for 30 minutes at moderate intensity burns approximately 9.8 × 70 × 0.5 × 1.0 = 343 calories.
Understanding Intensity Modifiers
Not every workout is performed at the standard effort level captured by a MET value. The intensity modifier lets you adjust: Light (0.8×) for casual or recovery-paced sessions, Moderate (1.0×) for the default effort the MET value was measured at, and Vigorous (1.2×) for all-out, high-effort workouts.
Food Equivalents Explained
Seeing your calorie burn expressed as food items makes abstract numbers tangible. The calculator converts your burn into pizza slices (285 cal), Big Macs (563 cal), cookies (150 cal), and bananas (105 cal). These are average values and will vary by brand and recipe, but they provide a useful frame of reference for understanding energy balance.
Factors That Affect Calorie Burn
Several variables influence how many calories you actually burn beyond what a MET-based formula can capture. Body composition matters — muscle tissue is more metabolically active than fat tissue, so two people at the same weight may burn different amounts. Age, fitness level, environmental temperature, altitude, and even genetics all play a role. Use this calculator as a solid estimate, not an exact measurement.
Walking-Distance Equivalent
The walking equivalent converts your calorie burn into miles of moderate-pace walking. This gives you an intuitive sense of scale — a vigorous 30-minute cycling session might be equivalent to walking 4 miles, helping you compare different activities on common ground.
Looking for more health and fitness tools? Browse all Health & Fitness tools for calculators covering BMI, macros, heart rate zones, and more.
Frequently Asked Questions
What is a MET value?
MET stands for Metabolic Equivalent of Task. One MET equals the energy burned sitting quietly, about 1 kcal per kilogram of body weight per hour. An activity rated 8 METs burns roughly 8 times that, so a 70 kg person jogging at 8 METs for one hour burns about 560 kcal.
How is calorie burn calculated?
The formula is Calories = MET x body weight (kg) x duration (hours). For example, a 70 kg person cycling at 6 METs for 30 minutes burns 70 x 6 x 0.5 = 210 kcal. This approximates net energy expenditure for moderate to vigorous activities.
Why do I burn fewer calories as I get fitter?
As fitness improves, movement becomes more efficient. Familiar activities can burn up to 20% fewer calories than they did when untrained. Progressive overload, which increases intensity or duration, helps counter this adaptation.
Do fitness trackers measure calories accurately?
Wrist-worn trackers typically estimate calorie burn within 20 to 30% of laboratory measurements. They tend to be more accurate for steady-state cardio than for strength training or HIIT. MET-based estimates are generally comparable in accuracy for moderate activities.
Does weight training burn calories like cardio?
Resistance training burns fewer calories per minute than intense cardio but has a larger afterburn effect (EPOC) and builds muscle, which raises resting metabolic rate. A typical strength session at 5 to 6 METs burns 200 to 400 kcal per hour for a 70 kg person.