Running Tools & Calculators to Support Your Training
Take your training to the next level with these free tools. Whether you're calculating pace, estimating race time, or dialing in heart rate zones — these tools are designed to help you train smarter and race stronger.
Pace Calculator
Convert between pace, speed, and time in kilometers or miles. Plan your runs and races with clarity.
Use Pace CalculatorRace Time Predictor
Estimate your race finish time using Riegel's formula based on a recent result. Great for realistic goal setting.
Predict Race TimeHeart Rate Zones
Calculate your personalized heart rate training zones based on resting and max heart rate — or let us estimate it for you.
Find Heart ZonesHow to Use These Running Tools Together
Use the pace calculator for daily training and workouts: hit your target splits, convert min/km to min/mile, and plan interval and tempo paces. Use the race time predictor when you're setting goals: plug in a recent race to estimate finish times for other distances. Use heart rate zones to control intensity so easy runs stay easy and hard runs stay hard.
Once you have these numbers, you can build a structured plan with our running plan generator, or browse time-based running plans and training guides to put it all into practice.
Quick questions
Do I need all the tools?
No. Start with the pace calculator for day-to-day use; add the race time predictor when you set a goal, and heart rate zones if you train by HR.
Which tool should I use first?
The pace calculator. It's the one you'll use most for workouts and planning. Then try the race time predictor when you pick a target race.
Are these tools free?
Yes. All tools are free to use with no sign-up required.