Running Tools & Calculators
Explore our collection of specialized running calculators and tools designed to optimize your training and racing performance. Each tool is built to help you make data-driven decisions about your running.
Training Tools
VO2 Max Calculator
Estimate your VO2 max from recent race times or Cooper test results. VO2 max is the gold standard measure of aerobic fitness and a key predictor of running performance.
Use it to: Track fitness improvements, predict race times, compare fitness levels
Training Zones Calculator
Calculate your personalized heart rate and pace training zones based on your max heart rate or lactate threshold. Essential for structured training plans.
Use it to: Set up zone-based training, avoid overtraining, maximize training efficiency
VDOT Calculator
Based on Jack Daniels' Running Formula, calculate your VDOT score and get personalized training paces for easy runs, tempo runs, intervals, and repetitions.
Use it to: Get science-backed training paces, structure your training plan, predict race performance
Race Planning Tools
Negative Split Calculator
Generate pace plans for running the second half of your race faster than the first. A proven strategy for achieving personal records.
Use it to: Plan race pacing strategy, target PRs, finish strong
Race Time Predictor
Predict your performance at other race distances based on a recent race result. Uses proven race equivalency formulas to give accurate estimates.
Use it to: Set realistic race goals, choose appropriate pace, plan race calendar
Age-Graded Calculator
Compare your race performance accounting for age and gender. See how your times stack up against world-class standards and track performance over time.
Use it to: Set age-appropriate goals, compare performances across years, celebrate achievements
Practical Utilities
Treadmill Pace Converter
Convert between treadmill speed (mph/kph), pace per mile, and pace per kilometer. Includes incline adjustment for elevation training.
Use it to: Match outdoor paces on treadmill, understand treadmill settings, plan indoor workouts
Altitude Adjustment Calculator
Adjust your race predictions and training paces for elevation. Running at altitude significantly impacts performance and recovery.
Use it to: Plan high-altitude races, adjust training expectations, prepare for elevation changes
Heat & Humidity Pace Adjuster
Calculate how heat and humidity will affect your running pace. Learn how to adjust your goals for weather conditions on race day.
Use it to: Set realistic goals in hot weather, avoid heat-related issues, plan hydration strategy
Need to Calculate Race Pace?
Use our main race pace calculator to get mile and kilometer splits for any distance.
Go to Pace Calculator