Pace Calculator: Pacesmith

Dial in race-day pace, predict your finish from any distance, plan splits, and train by VDOT — fast, offline, no account.

Enter one race result. Get your VDOT 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
• Get your VDOT fitness score based on Daniels' Running Formula
• See five training zones with precise pace ranges
• 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
• One-time purchase unlocks everything, forever