Running Tools
Running Calculators
Tools to help you train smarter and understand your running performance
Pace Calculator
Convert between pace, speed, distance, and time. Calculate your running pace or predict finish times for any distance.
Race Time Predictor
Predict your performance at different distances based on a recent race result. Plan your next race goal with accuracy.
Race Planning
Create your race pacing strategy with kilometer splits, elevation adjustments, and negative/positive split options.
Grade Adjusted Pace
Calculate your equivalent flat-ground pace when running uphill or downhill. Understand the true effort of hill running.
Wind Adjustment
Estimate how headwinds and tailwinds affect your running pace and race times. Plan for windy conditions.
Heat & Humidity
Adjust your running pace for hot and humid conditions. Understand heat stress and train safely in warm weather.
Altitude Adjustment
Convert a pace between sea level and altitude, in either direction. See what thin air costs you from 1500 m to the marathon.
Race Fuelling & Hydration
Build a race day plan for carbohydrate and fluid on one clock. Pre-race meal, hourly targets, sweat loss against recommended intake, and every intake timed.
Coaching
Not Every Question Has a Calculator
Eight tools will tell you what a pace is worth. None of them will tell you whether to race in six weeks or twelve, or what to do about the knee. That is the part I do with athletes, 365 days a year.
How to Use These Calculators
I designed these calculators to help runners of all levels better understand their training and racing. Whether you're planning your race, training on hills, or dealing with hot conditions, these tools provide the insights you need to train effectively and race smart. All calculators are scientifically valid, based on peer-reviewed research, established formulas, and real-world biomechanical principles.
Found This Useful?
These calculators are free — no ads, no sign-up — and they stay that way. They are built on peer-reviewed sport science and my own coaching practice, and I maintain them myself. If one of them saved you some time, you can buy me a coffee.
Buy Me a Coffee — €5Secure checkout through Stripe. €5 is one coffee; you can send more than one.