Coach Johnson
Fitness Expert
Coach Johnson is a certified personal trainer and sports performance specialist.
Calculators by Coach Johnson
Marathon Time Calculator
Calculate estimated marathon time from shorter race times using Riegel's formula. Enter a race distance and time to get a predicted marathon finish time and pace.
5K Time Calculator
Calculate 5K race time predictions using your current pace and training distance (Riegel formula).
10K Time Calculator
Calculate 10K race time predictions.
Cycling Power Calculator
Calculate cycling power output from force and velocity (Power = Force × Velocity).
Cycling Speed Calculator
Calculate cycling speed from cadence and gear ratio.
Bike Gear Calculator
Calculate bike gear ratios and gear inches.
Cycling Calorie Burn Calculator
Calculate calories burned during cycling.
Baseball Stats Calculator
Calculate baseball statistics like batting average, hits per 100 at-bats, and projected hits over a 600 AB season.
Basketball Stats Calculator
Calculate basketball statistics such as field goal percentage from field goals made and attempted.
Football Stats Calculator
Calculate football statistics (completion percentage and completion decimal) based on completions and pass attempts.
Golf Handicap Calculator
Calculate golf handicap index.
Tennis Serve Speed Calculator
Calculate tennis serve speed from distance and time.