Plans, paces & PBs Age Grade Calculator
Compare a 5km or 10km race time across age and sex using the restored RunningFastr age-grade factors.
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Running Calculators
Useful running tools for checking performances, choosing realistic targets, setting training paces and keeping the maths under control.
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Choose the calculation you need.
Each tool answers one clear running question: how fast, how far, what pace, or what target comes next.
Target Race Pace Calculator
Choose a target time, such as sub-20 for 5K, and see the pace, speed and splits required to get there.
Open calculatorTraining Pace Calculator
Use a recent race performance to estimate recovery, easy, steady, tempo, threshold and interval training paces.
Open calculatorRace Time Predictor
Enter a recent race result and estimate likely 1 mile, 5K, 10K, half-marathon and marathon equivalents.
Open calculatorRunning Pace Calculator
Enter a distance and time to calculate min/km, min/mile, average speed and useful split times.
Open calculatorRunning Split Calculator
Calculate exact 200m, 400m, 800m, 1km, mile or custom splits for a target race time.
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