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.
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.
These calculators are free and always will be — built on peer-reviewed sport science, my coaching practice, and a lot of careful work. If they've helped you and you'd like to see them maintained and improved, you can buy me a coffee!