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Fitness & Weight
Calories Burned Calculator — Walking, Running, Cycling & More
Turn your weight, your minutes and an activity's intensity into a calorie estimate
Ever wonder how many calories that 30-minute walk or your Saturday bike ride actually burns? This calculator gives you a fast, science-backed estimate using the MET method — the same approach fitness pros and research labs use.
MET stands for Metabolic Equivalent of Task. One MET is roughly the energy you burn sitting still. An activity with a MET of 8 burns about eight times that resting rate. Walking briskly is around 3.5 METs, running is near 9.8, moderate cycling about 7.5, swimming roughly 8, and weightlifting about 5.
The formula is simple:
Calories burned = MET × weight (kg) × time (hours)
Because Americans weigh themselves in pounds, the calculator converts for you (1 lb = 0.4536 kg). Here's a worked example. Say you weigh 180 lb (81.6 kg) and run for 30 minutes (0.5 hours) at a MET of 9.8:
9.8 × 81.6 × 0.5 ≈ 400 calories.
That's it — about 400 calories for a half-hour run. Switch the activity to brisk walking (3.5 METs) for the same person and time and it drops to about 143 calories. Intensity is everything.
The most common mistake is forgetting to convert pounds to kilograms — plug 180 straight into the formula and you'll overstate your burn by more than double. The calculator handles that automatically, so you just enter pounds. A second slip is mixing up minutes and hours: 30 minutes is 0.5 hours, not 30. Again, the tool does the math for you — enter minutes.
Keep in mind these are estimates of total (gross) calories, including the calories you'd burn just being alive during that time. Real burn varies with fitness level, age, terrain, temperature, muscle mass and how hard you actually push. Fitness trackers and gym machines use similar MET-based math and can disagree by 10–30%.
This calculator is informational only and is not medical or nutritional advice. Talk to a doctor or registered dietitian before starting a new exercise or weight-loss program.
📖 See also: How to Calculate a Tip (and Split the Bill)
Calculator
Fill in the fields and click "Calculate" for instant results.
📰 Formula
• Calories burned = MET × weight(kg) × time(hours) • weight(kg) = weight(lb) × 0.45359237 • time(hours) = duration(min) ÷ 60 • MET examples: walking 3.5 · running 9.8 · cycling 7.5 · swimming 8 · weightlifting 5
📰 Formula
• Calories burned = MET × weight(kg) × time(hours) • weight(kg) = weight(lb) × 0.45359237 • time(hours) = duration(min) ÷ 60 • MET examples: walking 3.5 · running 9.8 · cycling 7.5 · swimming 8 · weightlifting 5
🧪 Worked examples
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Example 2
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Example 3
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Example 4
⚠️ Common mistakes
- Putting weight in pounds straight into the formula without converting to kilograms.
- Entering duration in hours when the field asks for minutes (or vice versa).
- Using a MET that's too high — a casual stroll is ~2.5, not the 3.5 of a brisk walk.
- Treating the estimate as exact; real burn varies 10–30% with fitness, terrain and effort.
💡 Tips
- Pick the activity that best matches your real intensity — light vs. vigorous changes the MET a lot.
- For weight loss, pair the burn estimate with food tracking; ~3,500 calories ≈ 1 lb of fat.
- If you only know total workout time including rest, the estimate will run a bit high — count active minutes.
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<iframe src="https://www.calcnimbus.com/embed/calories-burned-calculator" width="100%" height="500" frameborder="0" style="border:1px solid #eee;border-radius:12px"></iframe>
❓ Frequently asked questions
How many calories does a 30-minute walk burn?
For a 155-lb person walking briskly (MET 3.5) for 30 minutes: 3.5 × 70.3 kg × 0.5 h ≈ 123 calories. Heavier people and faster paces burn more.
How does the calories burned calculator work?
It uses the MET formula: calories = MET × weight in kilograms × hours. You enter pounds and minutes, and it converts to kilograms and hours for you, then multiplies by the activity's MET value.
What is a MET value?
MET stands for Metabolic Equivalent of Task. One MET equals your resting energy use. An activity at 8 METs burns about eight times more energy per minute than sitting still.
Why does the calculator ask for my weight?
Heavier bodies use more energy to move. The same run burns more calories for a 200-lb person than a 130-lb person, so weight is part of the formula.
Are these calorie numbers exact?
No. They're estimates. Actual burn varies with fitness level, age, muscle mass, terrain, temperature and effort. Expect a 10–30% range, and treat the number as a guide, not a guarantee.
Does running burn more calories than walking?
Yes, a lot more. Running is about 9.8 METs versus 3.5 for brisk walking — nearly triple the burn for the same time, because it's far more intense.
How many calories do I need to burn to lose a pound?
Roughly 3,500 calories equal about 1 pound of body fat. Most healthy plans combine exercise with a modest calorie reduction in food rather than relying on workouts alone.
Why is my fitness tracker's number different?
Trackers use heart rate, stride and proprietary algorithms, while this tool uses standard MET tables. Both are estimates, so a 10–30% difference between them is normal.
Should I subtract resting calories from this number?
The MET formula gives gross (total) calories, including what you'd burn at rest during that time. For net exercise calories, subtract roughly one MET's worth — most people don't bother for a quick estimate.