If you see a lightning bolt like this: next to the listed Power for a segment, that means that the power value was recorded by a device called a power meter. A power meter is a device, generally integrated into either a bicycle's crankset, bottom bracket, or rear wheel, that accurately and continuously calculates the wattage - or Power - being generated by the rider.
When data from a power meter is not available, Strava can estimates power using information about an athlete's weight, speed, and elevation change. You'll need to do three things before Strava can estimate your power on a ride:
- Go to strava.com and enter your bike info under "My Gear" in your account settings. Then edit the activity and select your bike. If you don't create and select a bike on your activity, a default road bike weight of 9kg, or 20lbs, will be used.
- Enter your personal weight in your profile settings. It's helpful to enter your weight including your cycling clothes, shoes, and water bottles.
- Lastly, Strava will need trusted elevation data for your activity from either a device with a built-in barometric altimeter or automatically calculated from Strava's elevation basemap.
Average Power Calculations:
Average power gives your average power amount during the ride, expressed in Watts (a measure of how much energy you are placing into the pedals.) This is inclusive of the entire ride, and Strava includes zeros (coasting). Average power is most accurately measured by a power meter, though if you don't have a power we give a rough approximation through our power estimator.
Be sure to check out our power analysis features