Sport
Running pace, race predictions, lifting maxima and heart rate zones, from formulas that have a name.
Every estimate here comes from a published formula, named on the page with the study it came from and the range it was fitted over. That matters more in sport than almost anywhere: the numbers are estimates about a body, they carry real spread, and a figure presented without its source invites a confidence it has not earned.
Body mass index with the WHO band it falls in, and the waist-to-height ratio that covers what BMI misses.
Heart Rate ZonesTraining zones from a published estimate of maximum heart rate — with the spread that estimate carries.
One-Rep Max CalculatorEstimate a one-repetition maximum by four named formulas, so the spread between them is visible.
Pace and Speed ConverterTurn km/h into minutes per kilometre and back, with miles, swimming and rowing splits beside them.
Race Split TimesEvery split for a target finish time — what the watch should say at each marker.
Race Time PredictorPredict your time at another distance from a recent result, by the Riegel formula.
Running Pace CalculatorPace, speed and finish time over any distance — give the time or give the pace.