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Health & Fitness Numbers

What the calculators actually compute, where the formulas came from, and how much they can honestly tell you.

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Estimating a one-rep max, and where the formulas diverge

2026-08-27 · 3 min read

Two standard formulas agree exactly at ten reps and then pull apart fast. The arithmetic, and why an estimate from a high-rep set is worth much less than one from a low-rep set.

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Pace, speed and time are one relationship read three ways

2026-08-27 · 4 min read

Minutes per kilometer, kilometers per hour and total time are the same fact rearranged. The conversions worth carrying in your head, and why small pace changes compound over distance.

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What a calories-burned estimate actually is

2026-08-27 · 4 min read

The number comes from a MET value, a population average for an activity, multiplied by your weight and your minutes. What each part means, and why the output is a scale rather than a measurement.

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