Four Tools. One App.
Everything a serious runner needs to train by the science.
VDOT Training Zones
Enter any race result — a 5K, 10K, half marathon, or marathon — and Pacesmith instantly calculates your VDOT score using the Daniels-Gilbert formula. From that single number, you get five scientifically calibrated training zones, each with pace ranges in miles or kilometers and a brief explanation of what that zone trains.
Free — always available without purchase.
Race Predictor
Wondering what your 5K time means for a half marathon? Input any recent race result and see your predicted finish time at every standard distance — from 1500m through the full marathon. Based on the same VDOT methodology used by elite coaches.
Pace Calculator
A three-field calculator that solves for whichever variable you need. Enter a distance and time to get pace, or enter pace and distance to get time. Supports both miles and kilometers with instant results.
Split Planner
Generate a split-by-split race plan with your target pace and race distance. See exactly what every mile or kilometer should look like on race day — including that partial final split.
Built on Science
All calculations use Dr. Jack Daniels' VDOT formula — the same methodology used by elite coaches worldwide. No guesswork, no proprietary algorithms.
Ready to train smarter?
