Calories Burned Calculator

How Calories Burned Is Calculated — The MET Method

This calculator uses the MET (Metabolic Equivalent of Task) system, the gold standard used by exercise scientists and the American College of Sports Medicine. MET values represent the ratio of the metabolic rate during a specific activity to the resting metabolic rate. A MET of 1.0 = sitting at rest. A MET of 7.0 = running at approximately 6 mph.

Formula: Calories = MET × Weight (kg) × Duration (hours)

Example: Running at 6 mph (MET = 9.8) for 30 minutes at 155 lbs (70.3 kg): 9.8 × 70.3 × 0.5 = 344 calories. This formula is accurate within 10–15% for most people under normal conditions. Individual variation based on fitness level, terrain, temperature, and body composition can affect actual burn by up to 20%.

MET Values for Common Activities

Why Weight Matters

Calorie burn scales directly with body weight — a heavier person burns more calories doing the same activity for the same duration. This is because more mass requires more energy to move. A 200-pound person running for 30 minutes burns approximately 29% more calories than a 155-pound person doing the same run. This also means weight loss creates a double effect: as you lose weight, you burn slightly fewer calories per session at the same effort level, which is one reason why fitness plateaus occur.

How Exercise Interacts with Hunger

A critical and often overlooked variable: exercise increases appetite in many people, partially or fully compensating for the calories burned. Research published in the American Journal of Clinical Nutrition found that high-intensity exercise tends to suppress appetite acutely (immediately after the workout) but increases it over the following 24 hours. Low-intensity exercise like walking has a more neutral effect on appetite. This appetite compensation effect is highly individual — some people see significant hunger increases after exercise while others do not. Tracking total calorie intake alongside exercise output gives the most accurate picture of whether a fitness routine is creating the deficit needed for fat loss.

Cardio vs Strength Training

Cardio burns more calories during the workout. A 30-minute run burns roughly 300–400 calories; a 30-minute weight session burns 150–250. However, strength training builds muscle, which increases resting metabolic rate — each pound of muscle burns approximately 6–10 calories per day at rest, versus 2–3 for a pound of fat. Over weeks and months, the muscle-building effect of strength training often produces greater total fat loss despite lower per-session calorie burn.

Exercise Science: What the Research Says

Zone 2 Training and Fat Burning

Zone 2 cardio — maintaining 60–70% of your maximum heart rate for 30–60 minutes — has become the most-discussed training concept in longevity and metabolic health research. At this intensity, your body relies primarily on fat oxidation for fuel, and your mitochondria (the energy factories in cells) are trained to become more efficient. Dr. Inigo San-Millan's research with Tour de France cyclists shows that elite athletes spend the majority of their training volume in Zone 2. For fat loss and long-term metabolic health, this steady, conversational-pace effort is more important than most people realize — it builds the aerobic base that makes all other exercise more efficient.

HIIT vs. Steady-State: What Burns More?

A 30-minute HIIT session burns roughly 300–400 calories during the workout, comparable to a 30-minute moderate run. The difference is in what happens afterward. HIIT creates significant EPOC (excess post-exercise oxygen consumption) — your metabolic rate stays elevated for 12–24 hours, potentially burning an additional 80–150 calories. Steady-state cardio has minimal afterburn. However, HIIT is significantly harder to recover from, requiring 48+ hours between sessions, while you can do Zone 2 work daily. For total weekly calorie burn, a combination of 2 HIIT sessions plus 3–4 Zone 2 sessions typically outperforms either approach alone.

Non-Exercise Activity Thermogenesis (NEAT)

NEAT is arguably the most underestimated factor in daily calorie expenditure. NEAT refers to all the calories burned outside of formal exercise — fidgeting, walking to the car, taking stairs, cooking, cleaning, standing at a desk. Research shows NEAT can vary by 2,000 calories per day between individuals of similar size. A person with a physically active job or who walks frequently in their daily life can burn the caloric equivalent of 60–90 minutes of formal exercise just through incidental movement. This is why "stand more, sit less" advice has metabolic validity — even low-intensity movement throughout the day adds up substantially. A standing desk used for 4 hours burns approximately 100–150 more calories than sitting for the same period.

Calories Burned by Body Weight — Quick Reference

The Role of Muscle Mass in Long-Term Calorie Burn

Resting Metabolic Rate (RMR) accounts for 60–75% of total daily energy expenditure. Skeletal muscle is metabolically expensive tissue — each pound of muscle burns approximately 6–10 calories per day at rest, versus 2–3 calories per pound of fat. A person who adds 10 pounds of muscle through 6–12 months of resistance training increases their daily resting calorie burn by 60–100 calories. While modest per day, this adds up to 22,000–36,000 extra calories burned annually — the equivalent of 6–10 pounds of fat. This "slow burn" benefit of strength training is why it's considered essential for sustainable long-term weight management, even though it burns fewer calories per session than cardio.

Calories Burned by Activity — Real Numbers

How Long to Burn Off Common Foods

Putting calorie burn in food context makes exercise feel more tangible and motivating. At 155 pounds, moderate running (6 mph) burns about 11.4 calories per minute. That means burning off a 500-calorie fast food meal takes about 44 minutes of running. A 200-calorie candy bar takes about 17 minutes. A 900-calorie restaurant pasta dish takes 79 minutes. Walking burns roughly 4–5 calories per minute — burning off the pasta by walking alone would take over 3 hours. These comparisons explain why diet changes generally produce faster weight loss results than exercise alone.

Weight Loss Math — Setting Realistic Expectations

One pound of body fat contains approximately 3,500 calories. This is the foundational number for all weight loss planning. To lose one pound per week through exercise alone (without changing diet), you'd need to create a 500-calorie daily deficit through activity. At 155 lbs, that requires roughly 45–50 minutes of running, 60–70 minutes of cycling at moderate intensity, or 90–100 minutes of brisk walking — every single day. This is why most exercise scientists recommend combining moderate calorie restriction with exercise rather than trying to out-exercise a poor diet.

Top Calorie-Burning Activities Per Hour (155 lbs)