Cycling is one of the most efficient ways to burn calories, whether you're commuting, mountain biking, or spinning indoors. But how many calories you actually burn depends heavily on two key factors: speed and resistance. This article explains the science behind cycling calorie burn, provides a practical calculator methodology, and offers evidence-based estimates for different cycling scenarios.
We'll use MET (Metabolic Equivalent of Task) values to calculate energy expenditure. MET values are standardised by the Compendium of Physical Activities and allow you to estimate calories burned based on your body weight and activity intensity.
How Cycling Calorie Burn Is Calculated
The fundamental formula for calories burned per minute is:
Calories/min = (MET × body weight in kg × 3.5) / 200
This equation, derived from the MET method, estimates the oxygen consumption required for a given activity. For cycling, MET values range from about 4.0 for very light effort (under 10 mph / 16 km/h on a flat road) to 16.0 for racing or very vigorous effort (over 20 mph / 32 km/h).
Key Variables That Influence MET for Cycling
- Speed: Higher speeds require more power output, increasing MET exponentially.
- Resistance: Hills, wind, and terrain add resistance, raising MET even at the same speed.
- Body weight: Heavier individuals burn more calories per minute at the same MET because they move more mass.
- Cycling type: Stationary cycling (e.g., spin class) often uses different MET values than outdoor cycling due to lack of wind resistance and coasting.
Calories Burned by Speed (Outdoor Cycling)
Below are typical MET values for outdoor cycling on flat terrain without significant wind. Multiply by your weight in kg and 3.5, then divide by 200 to get calories per minute.
| Speed (mph) | Speed (km/h) | MET | Cal/hour for 70 kg (154 lb) |
|---|---|---|---|
| <10 mph | <16 km/h | 4.0 | 294 |
| 10–12 mph | 16–19 km/h | 6.0 | 441 |
| 12–14 mph | 19–22 km/h | 8.0 | 588 |
| 14–16 mph | 22–26 km/h | 10.0 | 735 |
| 16–19 mph | 26–30 km/h | 12.0 | 882 |
| >20 mph | >32 km/h | 16.0 | 1176 |
Note: These are estimates. Actual burn varies with wind, drafting, and bike type. For a personalised calculation, use our interactive calculator.
Calories Burned by Resistance: Hills & Terrain
Resistance dramatically increases calorie burn. Climbing a moderate hill (5–7% grade) at 8 mph (13 km/h) can yield a MET of 8.0–10.0, similar to riding at 16 mph on flat ground. Steep hills (10%+ grade) at low speed can push MET to 12.0 or higher.
For comparison, walking uphill also increases MET, but cycling uphill is generally more intense per minute due to the higher power output required.
MET Values for Cycling on Hills
- Gentle hill (2–3% grade), moderate speed: MET 7.0
- Moderate hill (5–6% grade), slow speed: MET 9.0
- Steep hill (8–10% grade), very slow speed: MET 12.0
- Mountain biking, technical terrain: MET 8.0–14.0 depending on effort
If you ride a hybrid bike on gravel or dirt paths, add 0.5–1.0 MET to the flat-road value because of increased rolling resistance.
Stationary Cycling: Spin Classes & Indoor Trainers
Indoor cycling typically uses MET values from the Compendium: 5.5 for light effort (50–75 watts), 7.0 for moderate (75–100 watts), 10.5 for vigorous (100–150 watts), and 12.5 for very vigorous (150–200 watts). Many spin bikes have a power meter (watts) that provides a more accurate calorie estimate than speed alone.
For example, a 70 kg person cycling at 100 watts (moderate effort) for 60 minutes burns about 490 calories (MET 7.0). At 150 watts (vigorous), that rises to 735 calories (MET 10.5).
Note: Many stationary bike consoles overestimate calories by 20–30% because they don't account for your body weight accurately. Use a heart rate monitor or power meter for better precision.
Comparing Cycling to Other Activities
Cycling burns fewer calories per hour than running at the same perceived effort, but it is joint-friendly and can be sustained longer. A 70 kg person running at 6 mph (10 min/mile) burns about 700 calories per hour (MET 9.8), while cycling at 14–16 mph burns about 735 calories (MET 10.0) — similar. However, running vs jogging differences show that jogging (5 mph) burns about 590 cal/hour, comparable to moderate cycling.
Walking is lower intensity: walking per mile for a 70 kg person burns about 100 calories, while cycling a mile at 14 mph burns about 45 calories but in much less time (4.3 minutes vs 20 minutes). So cycling is more time-efficient for calorie burn.
If you're considering treadmill vs outdoor exercise, outdoor cycling typically burns slightly more calories than stationary cycling at the same speed due to wind resistance and terrain variations.
How to Use a Cycling Calorie Calculator
To estimate your own burn, follow these steps:
- Weigh yourself in kg (or convert pounds by dividing by 2.205).
- Determine your average speed or power output (watts) for the ride.
- Select the appropriate MET value from the tables above or from the MET guide.
- Multiply MET × weight (kg) × 3.5 × duration (minutes) / 200.
Example: A 70 kg person cycles at 12 mph for 30 minutes. MET = 6.0. Calories = 6.0 × 70 × 3.5 × 30 / 200 = 220.5 calories.
For a more precise estimate, use a power meter. One kilojoule of work equals approximately one calorie burned, but human efficiency is about 24%, so actual calories burned = kJ / 0.24. A 70 kg rider producing 150 watts for 60 minutes expends 150 × 3600 / 1000 = 540 kJ, so calories = 540 / 0.24 = 2250 calories? That seems high — actually, that formula gives total energy expenditure, but net calories for cycling are lower because basal metabolism is already accounted for. In practice, most calculators use the MET method.
Practical Tips for Maximizing Calorie Burn
- Increase speed or resistance: Even small increases in pace or hill climbing boost MET significantly.
- Interval training: Alternate high-intensity efforts (e.g., 1 minute at 20 mph) with recovery. This can increase post-exercise oxygen consumption (EPOC).
- Use a heart rate monitor: Heart rate zones correlate with calorie burn; aim for 75–85% of max HR for optimal fat and calorie burn.
- Bike fit matters: Proper saddle height and position improve power transfer, allowing you to sustain higher speeds with less fatigue.
- Consider a power meter: Devices like the Garmin Rally pedals or Wahoo Speedplay (priced around £400–£1000 in the UK, $500–$1200 in the US) give real-time wattage, the most accurate measure of effort.
Conclusion
Cycling calorie burn is highly individual, but with speed and resistance as primary drivers, you can estimate your expenditure using MET values and a simple formula. Whether you ride outdoors or indoors, understanding these variables helps you plan workouts to meet your weight management or fitness goals. For a quick estimate, use our online calculator. Remember that consistency and progressive overload are key to long-term calorie burn improvements.