instant
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00:08:00
Precision
Pace
In the pursuit of the perfect pace, every second counts. This instrument calculates your splits with sub-millisecond precision, transforming raw distance and time into actionable race strategy.
No ads. No accounts. No friction.
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02
Instruments
01
Split Calculator
Mile-by-mile or kilometer splits for any distance. Negative splits, even pacing, or fully custom race strategies.
5K10KHalfFullUltra
02
Race Predictor
Input a recent race time. Receive predicted finish times from 5K to ultramarathon using proven equivalency formulas.
Riegel · Cameron · VO2max
03
Training Zones
Calculate your easy, tempo, threshold, and interval paces based on recent race performance.
EMTIR
04
Instant
No page reloads. Results update as you type. Sub-50ms response time.
<50ms
Run the
numbers
Free forever. No account. No ads. Works offline.