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Add caffeine by serving, calculate mg/kg, and compare the label total with the FDA 400 mg reference statement for most…

Calculate a daily fasting interval and eating-window end time from a user-selected schedule without weight-loss or safety promises.

Model caffeine remaining from one dose using elapsed time and an adjustable half-life, with FDA-sourced variability warnings.

Calculate sleep efficiency and awake time in bed from matching sleep-duration estimates with clear measurement limits.

Compare average actual sleep with a chosen nightly target across a selected period using transparent signed arithmetic.

Calculate a suggested bedtime from your planned wake time, sleep target, and settling allowance without unsupported sleep-cycle promises.

Model a clearly labeled activity-only timeline from additional daily steps, stride, speed, body weight, and a static energy-equivalent assumption.

Calculate official IPF GL points for classic or equipped powerlifting and bench press with all eight coefficient sets, units, and…

Calculate outdoor-sun or indoor/shade WBGT from measured natural wet-bulb, black-globe, and dry-bulb temperatures with clear safety limits.

Estimate VDOT from race distance and time with visible Daniels-Gilbert terms, pace, unit conversion, and a clear distinction from measured…