Free running calculators

Plan your pace, predict race times and train in the right zones. 12 tools, all free.

Pace Calculator

Race Time Predictor

Heart Rate Zones

Want this done for you on every run?

Pace and race times

Plan your pace and see what you could run.

Pace CalculatorYour pace per km or mile for any distance and time.

Race Time PredictorPredict your 5K, 10K, half and marathon times from one race.

Marathon Time PredictorEstimate your marathon finish from a recent 5K or 10K.

Race Split CalculatorCheckpoint-by-checkpoint splits for your goal time.

Age Grade CalculatorCompare your time against world standards for your age.

Your numbers, every run

Stop calculating. Start growing.

Run&Grow tracks your pace, distance and time on every run, then turns each run into a plant in your garden.

Every run grows a new plant
Skip a week? Your garden waits
Works with Apple Health and Apple Watch

4.6 on the App Store

Also on Android

Run&Grow garden calendar with a plant on each run day

Training

Build up safely and stay on track.

Heart Rate ZonesYour 5 training zones with the Karvonen method.

Couch to 5K CalculatorPick a start date and see when you will run your first 5K.

Run-Walk IntervalsPlan run-walk cycles and predict your finish time.

Running Streak CalculatorCount your running days and milestones.

Fitness and body

Understand your fitness and energy.

VO2 Max CalculatorEstimate your cardio fitness from a race or test.

Calories BurnedHow many calories your run burned.

BMI for RunnersBody mass index with running context.