❤️ Health, Body & Fitness

9 browser-local tools · page 1 of 1

Health, Body & Fitness. Body maths with the formula named on the page: BMI against the published WHO bands, a healthy weight range for your height, basal metabolic rate and daily energy needs from the Mifflin–St Jeor equation, hydration and electrolyte estimates, training heart-rate zones from your maximum, the exponential decay of caffeine through a half-life, pace splits for a run and a breathing pacer you can follow on screen.

9 tools on this shelf · 9 listed below

❤️BMI & Calorie CalculatorBMI with WHO bands, your healthy weight range for height, BMR and daily calorie needs (Mifflin-St Jeor) plus body-fat and waist-to-height estimates. 😴Sleep-Cycle CalculatorThe napkin maths of sleep: count back in 90-minute cycles from your alarm and see which bedtimes wake you mid-cycle-free. 🔥Calorie & TDEE CalculatorBMR and daily calorie needs via Mifflin-St Jeor — the formula dietitians actually validate against — with weight-change rows instead of promises. 🏃Running Pace CalculatorPace per km and mile, even splits from 5K to marathon, and the Riegel 1.06 prediction with its honest warning about the wall. 💧Water TargetHow much water is actually enough for your weight, your training week and your climate — converted into glasses, bottles and an hourly sip pace you can follow. 🫁Breathing PacerFollow a growing and shrinking circle through coherent, box and 4-7-8 breathing — the visual pacer that makes a one-minute calm session actually work. 🩸Blood Type PunnettThe ABO cross done honestly as a Punnett square — pick both parents\u2019 genotypes and see why two group-A parents can have an O child, with every odds percentage. 💓HR ZonesTraining zones computed the way exercise science does — heart-rate reserve from your <i>resting</i> rate, not raw percentages of a mythic 220-minus-age max. ☕Caffeine Half-LifeTrack the exponential decay of your last coffee hour by hour — when the body load drops below 100 mg, and how much is still circulating when you plan to sleep.

How these tools work

These are calculators, not advice. BMI cannot see body composition, an equation for calorie needs is a population average applied to one person, and a heart-rate formula carries a spread of several beats either way — each page says as much and points out which input the numbers are sensitive to. Nothing you type leaves the device, which is the only reason a page like this should be trusted at all.

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