Strength & endurance calculators
Strength & endurance calculators — 3 tools, each showing the formula it uses, the source that published it, and the date that source was last checked.
One rep max calculator
A one rep max calculator predicts the heaviest single you could lift from a set you actually completed. It runs Epley and Brzycki together, shows where they agree and where they diverge, gives the percentage table for every rep count, and widens the stated uncertainty above ten reps where the published validation stops.
PopularPace calculator
A running pace calculator converts a finish time and a distance into pace per kilometre and per mile, with even splits for every marker including the fractional last one. It also projects equivalent times at 5K, 10K, half marathon and marathon using the Riegel equation, shown as a spread rather than a promise.
PopularCalories burned calculator
A calories burned calculator multiplies an activity's MET value by your body weight and duration, using the equation kcal per minute equals MET times 3.5 times kilograms divided by 200. Every MET value comes from the 2024 Adult Compendium with its activity code, and the tool shows the net figure alongside the gross one.
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