Runner’s calibration bench
Measure the run. Then train the runner.
Five free calculators for the decisions runners make most: pace, race targets, aerobic fitness, training intensity, and energy cost.
Calculators provide estimates. Your plan still needs current mileage, available days, race date, and recovery context.
Choose an instrument
What do you need to calculate?
Pace Calculator
Convert any two of time, distance, and pace into the number you need.
Race Time Predictor
Turn a recent race result into realistic targets for your next distance.
VO2 Max Calculator
Estimate aerobic fitness from a recent race effort and compare the range.
Training Zones
Set useful heart-rate and pace bands for easy, tempo, and hard running.
Calorie Calculator
Estimate running energy cost from body weight, distance, and optional pace.
Numbers are the checkpoint
The training plan is the course.
Bring your pace, target, or fitness estimate into a plan built around your actual week—not an idealized schedule.
Create my running plan