No wearable required
Running tools for everyone
Free calculators for runners, joggers, and walkers. No GPS watch, no wearable, no account needed — just numbers that help you run smarter.
Pace Calculator
Enter any two of distance, time, or pace — get the third instantly. Switch between km and miles.
Race Time Predictor
Know your 5K time? Get predicted finish times for 10K, half marathon, and marathon using the Riegel formula.
VO₂ Max Estimator
Estimate your aerobic fitness from a recent race result. No lab test required.
Training Pace Zones
Get your five training zones — from easy recovery runs to VO₂max intervals — based on a reference race.
Calories Burned
Estimate calories burned on a run from your distance, weight, and pace.
Activity Log
Track your runs over time — streak, personal bests, shoe mileage. Coming soon.
Manual entryDate, distance, time. No sensors, no sync, no faff.
No lock-inYour data is yours. Export to CSV any time.
Works everywhereAny device, any browser. No app install.