run(math)
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Precision Running & Pacing Logic

No-Nonsense Pacing & Training Math

Stop guessing your workout targets. Instantly calculate accurate race predictions, training splits, and fueling schedules based on hard numbers.

Live Race & Pacing Calculator

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How Does the run(math) Calculator Work?

run(math) uses the proven Riegel Formula, the gold standard in endurance sports science. By taking your recent race finish time—whether from a 5K, 10K, half marathon, or full marathon—it mathematically projects your equivalent race times across other distances and derives optimal, physiologically sound training paces.

Why Accurate Training Paces Matter

Training at the correct intensity ensures you build aerobic capacity during easy and long runs while avoiding burnout during recovery days. Whether you are targeting threshold intervals, tempo runs, or your goal race pace, run(math) eliminates the guesswork so every mile has a specific purpose.