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The pace calculator that serious runners trust. Calculate splits, predict times, crush PRs.

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Built for performance

Every feature designed to help you run smarter, train harder, and race faster.

Instant splits

Get mile-by-mile breakdowns instantly. Plan negative splits, even pacing, or custom strategies.

Race predictions

Input one race, predict them all. 5K to ultra distances using proven equivalency formulas.

Training zones

Easy, tempo, threshold, interval. Know exactly what pace to hit for every workout.

Zero friction

No account required. No ads ever. Works offline. Just open and calculate—the way tools should be.

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