Sports & Fitness
Pace, race times, lifting, and training calculators.
Running Pace Calculator
Solve for pace, time, or distance — whichever you need.
Race Time Predictor
Predict your finish time at another distance using Riegel's formula.
One-Rep Max Calculator
Estimate your 1RM from any working set, with a training percentage table.
VO2 Max Calculator
Estimate aerobic fitness from the Cooper 12-minute run test.
Heart Rate Zone Calculator
Training zones from your age and resting heart rate (Karvonen method).
Bowling Score Calculator
Enter your rolls, get the correct ten-pin score — strikes and spares included.