Pace Calculator vs RunReady Copilot

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

RunReady helps you plan today's run using Apple Health data and your own recent history. TODAY'S RUN See a suggested effort, the reasoning behind it, and available workout targets. Expand the score and data details to understand what contributed. iPhone guidance considers readiness and recent training information. YOUR PERSONAL BASELINE Resting heart rate, heart rate variability, respiratory rate and sleep can contribute. Each scoring signal needs at least seven valid observation days in the recent 30-day window, and at least two current signals are required for a score. Missing or outdated data is identified clearly. RUNNING AND RECOVERY Explore your health signals, running history, available recovery metrics and training information. On supported devices, on-device Apple Intelligence can provide an explanation; a built-in explanation is available otherwise. APPLE WATCH A compact Watch estimate, readable biometric rows, a refresh button and a watch-face complication. The Watch uses its own biometric calculation; see the iPhone app for training-aware run guidance. A home-screen widget is also included. PRIVACY No account required. Health data and derived results are processed and stored locally. Settings can sync between your paired iPhone and Apple Watch. No developer-operated cloud service or advertising analytics. RunReady provides general fitness information, not medical advice. Data availability depends on your devices and Apple Health records.