Name: XC Virtual Power
Rating: 4.5 (4 reviews)
Author: WLLK

XC Virtual Power estimates your real-time cycling power from GPS speed, elevation grade, wind, and your bike's physical properties - no power meter needed.

On-screen during your ride:

Color-coded 7-zone power gauge with a live marker showing exactly where you sit relative to your FTP, your current zone highlighted
Current, average and max power, live VO2 estimate
Dark or Light display theme - pick whichever is easier to read in your conditions

After your ride in Garmin Connect:
Avg Power, Max Power, Best 5-min Power, Best 1-min Power, Normalized Power, Variability Index, Power-to-Weight (W/kg), mechanical work (kJ), estimated VO2max (peak 8-minute effort and ride average), and a full power graph.

Settings, your way:

Rolling resistance: enter your tire's rated wattage (from a standard rolling-resistance test) and pick your terrain (Asphalt/Mixed/Trail) to scale it to what you're actually riding on - or skip the watts and just pick a terrain for an instant estimate
Aerodynamics: pick your riding position (Upright/Fitness/Aerodynamic) - no wind-tunnel numbers required
Wind: automatic (from the Weather API on your paired phone) or manual entry - pick a compass direction, no need to know the exact degrees
Fully customizable training zones, rider weight, and bike weight