Running calculators and local training log
Calculate pace and splits, plan intervals, and track runs, shoes, personal bests and races — locally and without an account.
🔒 Your logs stay on your device.
Pace calculator
Get the first result in seconds.
From plan to history
Running pace calculator
Calculate pace per kilometre and mile plus average speed from distance and time.
Running split calculator
Create even splits and cumulative times for a chosen distance.
Race time predictor
Estimate a time for another distance from a recent result.
Race pace planner
Build an even, negative-split or positive-split race plan kilometre by kilometre.
Interval workout builder
Build a workout with warm-up, repetitions, recoveries and cool-down.
Run-walk timer
Create run-walk cycles and start a simple local timer.
Treadmill pace converter
Convert pace to treadmill speed and back in metric and imperial units.
Track lap calculator
Calculate laps and remaining distance for a track and chosen lane.
Weekly mileage planner
Outline arithmetic weekly mileage progression with cutback weeks.
Why BiegajTo?
One calculation engine
Pace, splits and predictions use shared units and formulae.
Return without an account
Training, personal bests, shoes and races are stored locally.
Honest limitations
The service provides calculations, not fitness or health promises.