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Calculate your cycling speed in km/h or mph instantly with our free online Bike Speed Calculator. Perfect for road, MTB, gear, and power-based biking.
Cycling is not just a hobby or workout it's a science of speed, power, and precision. Whether you're riding a mountain bike, a road bike, or a hybrid, knowing your actual speed is crucial. That's why we built the Bike Speed Calculator an easy tool that helps you calculate your bike speed based on different inputs like wheel size, cadence, gear ratio, and more.
Whether you're training for a race, commuting daily, or just curious about how fast you're really going, this calculator is designed for simplicity and accuracy. No technical jargon, just straightforward results anyone can understand.
A Bike Speed Calculator is a tool that helps you determine how fast you’re cycling based on specific variables. It factors in your cadence (RPM), gear ratio, wheel diameter, and other important metrics to estimate your speed in kilometers per hour (km/h) or miles per hour (mph). For those who train seriously, it can also help you convert your power output (watts) into speed.
Using the calculator is super simple. Just enter the following details:
You can choose your tire size in inches (e.g., 26", 27.5", 29") or in millimeters (e.g., 700c for road bikes). Wheel size affects how much ground you cover with each pedal rotation.
Cadence is how fast you’re pedaling measured in rotations per minute. A higher cadence usually means faster speed, but it depends on your gear.
This is calculated by dividing the number of teeth on the front chainring by the number of teeth on the rear cog. For example, a 50-tooth front and 12-tooth rear give a gear ratio of 4.16.
If you have a power meter, you can input your watts. The calculator will estimate your speed based on this energy output.
Once you input all the values, hit Calculate, and the calculator instantly shows your cycling speed in km/h and mph.
Here’s the basic formula the calculator uses:
Speed (km/h) = Wheel Circumference (in meters) × Cadence (RPM) × Gear Ratio × 60 ÷ 1000
For mph, it adjusts by a conversion factor from kilometers to miles (1 km ≈ 0.621371 miles).
Wheel Circumference can be calculated as:
Circumference = Wheel Diameter × π (approximately 3.1416)
If you're entering power (watts), the calculator uses known cycling physics formulas to estimate speed based on resistance, body weight, and terrain, but that’s kept hidden for ease.
Let’s say you’re using a 700c road bike with a wheel diameter of 0.7 meters, a cadence of 90 RPM, and a gear ratio of 4.
Step-by-step:
So at 90 RPM in that gear setup, you’re traveling around 47.6 km/h pretty fast!
Yes! 20 mph (about 32 km/h) is considered a strong average for road cyclists. Recreational riders usually average around 15–18 mph (24–29 km/h), while pro racers can go well above 25 mph.
25 mph (40.23 km/h) is very fast, often achievable by seasoned cyclists or during a sprint. On flat terrain with good aerodynamics, experienced cyclists can maintain this speed for short durations.
It depends on your gear and wheel size. But using our earlier example, 90 RPM with a 4.0 gear ratio on a 700c bike can give you about 47–50 km/h. So yes, 90 RPM can mean serious speed if geared right.
The average cycling speed for most casual riders is around 18 to 22 km/h. For mountain bikers (MTB), it's often slower due to rough terrain typically 10 to 15 km/h. Road bikers tend to be faster, averaging 25 to 30 km/h.
The Bike Speed Calculator makes cycling data easy to understand for everyone from beginners to pro riders. Whether you're checking how fast you went on your last ride, optimizing your training cadence, or just playing with gear setups, this tool offers a fast and accurate answer.
Yes, it supports MTB-specific wheel sizes and gear ratios.
Absolutely. You can input your power (in watts) to estimate your speed if you use a power meter.
Anywhere between 15–20 km/h is great for beginners. Focus on consistency over speed.
It helps for accuracy, but you can estimate it if you're unsure.
Yes! Combine speed and time using the formula:
Distance = Speed × Time