REPACE vs Pace Calculator

REPACE can be your “Personal Workout Coach” Stop working out by running your longest and fastest miles. REPACE, your Personal Workout Coach, will guide you with a personalized workout program that takes into account your endurance and health levels by measuring your biometric data. You will experience a dramatic change in your physical performance with REPACE on your side. We integrate with the health app (HealthKit) to read and track your heart rate data and show them in a beautiful way (Heart rate functions in the app can be imported in conjunction with Apple Watch.)

Enter one race result, or just enter your VDOT. Get your fitness score and five science-backed training zones instantly — free. Pacesmith uses Jack Daniels' Running Formula to calculate your VDOT score from any recent race. You'll see exact pace ranges for Easy, Marathon, Threshold, Interval, and Repetition training — the same zones elite coaches prescribe. VDOT & TRAINING ZONES (FREE) - Enter any race distance and finish time - Or enter your VDOT directly if you already know it, and watch the paces update as you adjust it - Get your VDOT fitness score based on Daniels' Running Formula - See five training zones with precise pace ranges, in kilometres or miles - Track how your fitness changes over time UNLOCK ALL TOOLS — ONE-TIME PURCHASE Three additional calculators, yours forever. No subscription. No account. RACE PREDICTOR Predict your finish time at every standard distance — from 1500m to the marathon — based on your current VDOT. Enter one result, see them all. PACE CALCULATOR A three-way solver: enter any two of pace, time, and distance to calculate the third. Get per-kilometre or per-mile splits for any run. SPLIT PLANNER Build a race-day pacing plan with even or negative split strategies. See your target time for every single kilometre or mile. BUILT FOR RUNNERS WHO CARE ABOUT THE DETAILS - Jack Daniels' VDOT formula — not guesswork - Last 50 calculations saved automatically - Clean, fast interface — no ads, no clutter - Works offline - Available in 15 languages - One-time purchase unlocks everything, forever