This calculator uses MET (Metabolic Equivalent of Task) values — a scientifically validated method used by researchers and fitness professionals worldwide. While individual results vary based on factors like fitness level, body composition, age, gender, and efficiency of movement, MET-based estimates typically fall within 10–20% of actual energy expenditure. For more precise tracking, consider using a heart rate monitor or metabolic testing. This tool provides an excellent starting point for estimating calorie burn during walking, running, and cycling.

MET stands for Metabolic Equivalent of Task. One MET represents the energy your body uses at complete rest (approximately 1 kcal per kg of body weight per hour). An activity rated at 3 METs requires three times the resting energy expenditure. MET values allow standardized comparison across different activities regardless of individual differences. For example:

• 1 MET — Sitting quietly, sleeping
• 3 METs — Walking at 3 mph (moderate pace)
• 6 METs — Jogging at 5 mph
• 8+ METs — Running, vigorous cycling

MET values are compiled in the Compendium of Physical Activities, a widely cited reference in exercise science.

Body weight is a primary factor in calorie expenditure. A heavier person burns more calories performing the same activity for the same duration because moving a larger mass requires more energy. For example, a 90 kg (198 lb) person walking at 3 mph for 30 minutes burns approximately 135 calories, while a 60 kg (132 lb) person burns about 90 calories — a 50% difference. This is why the calculator requires your weight for an accurate estimate. Weight-bearing activities like walking and running amplify this effect compared to non-weight-bearing activities like cycling.

On average, walking burns approximately 50–100 calories per mile, depending heavily on body weight and walking speed:

• 120 lb (54 kg) person: ~55–65 cal/mile at 3 mph
• 155 lb (70 kg) person: ~70–85 cal/mile at 3 mph
• 190 lb (86 kg) person: ~90–105 cal/mile at 3 mph

Walking faster (brisk or power walking) increases the per-mile burn by 15–30%. Interestingly, running burns more calories per minute but roughly the same calories per mile as walking at a brisk pace — the difference is that running covers more miles in less time.

Both are excellent calorie burners, but they differ in key ways:

• Running generally burns more calories per minute because it engages more muscle groups and is weight-bearing. Running at 6 mph (10 min/mile) burns roughly 8–12 kcal/min for most people.
• Cycling is lower-impact and can be sustained for longer durations. Vigorous cycling (14–16 mph) burns approximately 8–10 kcal/min.

The "better" choice depends on your goals: running for maximum per-minute burn; cycling for longer, joint-friendly sessions that can lead to higher total calorie expenditure. Many athletes cross-train with both for balanced fitness.

Burning 500 calories in a single session is achievable with moderate-to-vigorous exercise. Here are approximate durations needed for a 70 kg (154 lb) person:

• Walking briskly (4 mph): ~90–100 minutes
• Running (6 mph): ~40–50 minutes
• Cycling vigorously (14–16 mph): ~45–55 minutes
• Power walking (4.5+ mph): ~60–70 minutes

Heavier individuals will reach 500 calories faster; lighter individuals may need more time. Use this calculator with your specific weight and preferred activity to get a personalized estimate. Combining exercise with a modest calorie deficit from diet is often the most sustainable approach for weight loss.

Both intensity and duration matter, but intensity has a greater per-minute impact. Doubling your speed more than doubles the MET value — for example, walking at 3 mph is ~3 METs, while running at 6 mph is ~8.3 METs (nearly 3× higher). However, higher intensity can't be sustained as long. The optimal approach for calorie burning:

• Short on time? Prioritize intensity (HIIT, fast running, vigorous cycling)
• Have more time? Moderate-intensity longer sessions accumulate significant calories
• Best of both: Mix high-intensity interval training (HIIT) with longer steady-state cardio throughout the week

The "afterburn effect" (EPOC) is also greater after high-intensity exercise, meaning you continue burning extra calories for hours post-workout.

Absolutely. One pound of body fat equals approximately 3,500 calories. By estimating the calories you burn per session and per week, you can plan your exercise routine to support weight loss goals:

• Burning 500 extra calories per day (through exercise or combined with diet) can lead to about 1 lb of weight loss per week
• Aiming for 250–300 calories per session, 4–5 times per week is a realistic target for many people
• Use the weekly projection in this calculator to see your estimated weekly calorie burn and adjust frequency or intensity as needed

Remember: weight loss is most effective when combining regular exercise with mindful nutrition. This calculator helps you understand the exercise side of the equation. For personalized advice, consult a registered dietitian or certified fitness professional.