Calories Burned Calculator
Estimate calories burned during an activity using standard MET (Metabolic Equivalent of Task) values.
Calories Burned Calculator: MET Formula & Complete Guide
Written by Mathew | Financial Tools & Calculation Specialist · Last updated August 21, 2026
In two sentences: A calories burned calculator estimates energy expenditure during exercise using the MET formula — Calories = MET × Weight (kg) × Duration (hours) — where MET values range from about 2.5 for slow walking to 11.8 or higher for fast running. This guide breaks down the formula, a MET value reference table, worked examples across common activities, and why cardio machine displays are often meaningfully less accurate than a MET-based calculation.
What Is a Calories Burned Calculator?
A calories burned calculator estimates the energy expended during a specific physical activity, using standardized MET (Metabolic Equivalent of Task) values combined with your body weight and activity duration. One MET represents the energy cost of sitting quietly at rest, and every other activity is expressed as a multiple of that baseline.
The Calories Burned Calculator Formula
Calories Burned = MET × Weight (kg) × Duration (hours)
An equivalent version, working directly in minutes, is commonly used as well:
Calories Burned = (MET × 3.5 × Weight in kg ÷ 200) × Duration (minutes)
Both formulas produce the same result — the second simply restructures the math around minutes and the physiological definition of one MET (3.5 ml of oxygen per kg of body weight per minute).
MET Value Reference Table
| Activity | Approximate MET |
|---|---|
| Sitting quietly (baseline) | 1.0 |
| Slow walking (2 mph) | 2.5 |
| Yoga | 2.5–3.0 |
| Walking the dog | 3.0 |
| Brisk walking (3.5 mph) | 4.3 |
| Cycling, leisurely | 4.0–6.0 |
| Moderate jogging | 7.0–8.0 |
| Running (7.5 min/mile pace) | 11.8 |
| Jump rope | 10.0–12.3 |
Worked Examples
Example 1: Walking the dog
A 70 kg person walks their dog for 30 minutes at a MET of 3.0.
Duration in hours = 30 ÷ 60 = 0.5
Calories Burned = 3.0 × 70 × 0.5 = 105 calories
Example 2: A fast run
An 81.8 kg (180 lb) runner completes a 60-minute run at a 7.5 minute-per-mile pace (MET of 11.8).
Calories Burned = 60 minutes × ((11.8 × 3.5) × 81.8 ÷ 200)
= 60 × (41.3 × 81.8 ÷ 200)
= 60 × 16.9
≈ 1,013 calories
Example 3: Comparing two activities at the same duration
A 65 kg person doing 45 minutes of yoga (MET 2.75) versus 45 minutes of brisk walking (MET 4.3).
Yoga: Calories = 2.75 × 65 × 0.75 = 134 calories
Brisk walking: Calories = 4.3 × 65 × 0.75 = 210 calories
Despite identical duration, the higher-intensity activity burns over 50% more calories — a direct reflection of how the MET formula scales calorie burn primarily with activity intensity, not just time spent.
Example 4: Comparing the same activity at different body weights
Two people both jog for 30 minutes at MET 8.0, one weighing 60 kg and the other 90 kg.
60 kg: Calories = 8.0 × 60 × 0.5 = 240 calories
90 kg: Calories = 8.0 × 90 × 0.5 = 360 calories
The heavier individual burns significantly more calories doing the identical activity for the identical duration, since body weight is a direct multiplier in the formula — moving more mass requires more energy, regardless of the specific activity.
Step-by-Step: How to Use a Calories Burned Calculator
- Enter your body weight in kilograms (convert from pounds if needed).
- Select the activity that best matches your actual pace and effort level, using the MET reference table as a guide.
- Enter the duration of the activity.
- Apply the formula to calculate estimated calories burned.
- For mixed-intensity sessions, calculate each distinct segment separately using its own MET value, rather than trying to average the whole session into a single number.
Why Cardio Machine Calorie Displays Are Often Inaccurate
Gym equipment calorie counters are commonly cited as running 20-40% off from actual energy expenditure, largely because they use simplified formulas that often don’t account for individual body weight accurately, or rely on generic assumptions that don’t reflect a specific user’s actual effort level. A MET-based calculation using your real body weight, applied consistently, is generally considered more reliable than trusting a machine’s built-in display, even though both are still estimates rather than lab-measured values.
Common Calories Burned Calculator Mistakes
- Treating MET estimates as precise, individualized measurements. MET values are population averages from research studies, and actual individual calorie burn can vary by 20-30% based on fitness level, body composition, and exercise efficiency.
- Double-counting BMR and exercise calories. The MET formula already accounts for baseline metabolic rate during the activity period — if you’re separately tracking BMR for the rest of the day, adding it again during exercise hours overstates your total.
- Assuming intensity stays constant throughout a session. If your effort level varies significantly during a workout, using a single MET value for the entire duration will understate high-effort portions and overstate lower-effort ones.
- Ignoring the significant role of body weight. As shown in Example 4, two people doing an identical activity for an identical duration can have meaningfully different calorie burns — weight is a direct multiplier, not a minor adjustment.
Using a Calories Burned Calculator to Track Progress Honestly
A calories burned calculator is most valuable when used consistently as a comparison tool across workouts, rather than trusted as an exact daily number.
Practical ways to use a calories burned calculator
- Log the same activities the same way every time. Using a calories burned calculator consistently — same MET values for the same activities — lets you compare relative effort week to week even if the absolute numbers carry some individual error.
- Cross-check against a fitness tracker, but don’t assume either is exactly right. Wearable devices and a calories burned calculator often disagree by a meaningful margin, and neither should be treated as a precise ground truth — using both together gives a reasonable estimated range.
- Avoid “earning back” calories 1-for-1 from exercise. Since a calories burned calculator’s estimate carries real uncertainty, treating a workout as license to eat back the exact estimated calories can undermine a calorie deficit faster than expected if the estimate ran high.
- Break mixed workouts into segments for a more accurate total. Rather than assigning one MET value to an entire varied session, running each distinct portion of a workout through a calories burned calculator separately and summing the results produces a more realistic overall estimate.
Frequently Asked Questions
It provides a reasonable estimate based on population-averaged MET values, generally considered more reliable than gym equipment displays, but individual variation of 20-30% due to fitness level, efficiency, and other factors means the result should be treated as a planning estimate rather than a precise measurement.
Many people add exercise calories to their daily budget rather than subtracting them from their base intake — for example, with a 500-calorie daily deficit target, burning 400 calories through exercise means only 100 calories of dietary reduction is needed to hit that same deficit.
Differences often come down to which MET value table is being referenced, whether the calculator uses corrected MET values adjusted for individual characteristics, and small formula variations — checking which specific source’s MET values a calculator uses helps explain discrepancies between tools.
Basic MET-based calculators generally do not adjust for individual fitness level, meaning a highly trained athlete and a beginner performing the same activity at the same MET-defined intensity receive the same calorie estimate, even though real-world efficiency differences exist between the two.
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In summary, a calories burned calculator applies the standardized MET formula to estimate energy expenditure from body weight, activity intensity, and duration, and understanding both its real-world accuracy limits and why it typically outperforms gym equipment displays helps you use the result as a genuinely useful planning tool.
About the author: Mathew is a Financial Tools & Calculation Specialist focused on building and fact-checking online calculators across health, fitness, and exercise science topics.
Note: This calculator and article are provided for general educational and informational purposes only and do not constitute medical advice. MET-based estimates are population averages and individual results can vary significantly. Consult a doctor or fitness professional for personalized exercise and nutrition guidance.