Health calculators based on trusted public guidelines

Free, fast health and fitness calculators — BMI, daily calories, sleep, hydration, heart-rate zones and more. Built on recognized public guidelines, with every formula and its limits explained. Educational only, not medical advice.

Choose a calculator

BMI Calculator Body Mass Index with WHO categories and your healthy weight range. Calorie / TDEE Calculator Daily calorie needs from BMR and activity level. Ideal Weight Calculator A healthy weight range from four classic formulas. Waist-to-Height Ratio A quick screen for central body fat. Heart Rate Zones Five training zones via the Karvonen method. Steps to Calories Distance and calories burned from your step count. Water Intake Calculator A daily hydration estimate from weight and activity. Sleep Calculator Best bedtime and wake times by 90-minute cycle. Period Tracker Predict your cycle — saved only on your device. Stress Check-in A private, non-diagnostic self-reflection.

Why AllHealthCalc

Every calculator here is built on recognized public health guidelines and shows its work: the formula, how to read your result, and where it falls short. We are deliberate about limits — a calculator is a starting point for a conversation with a professional, not a diagnosis.

All calculations run entirely in your browser. We store nothing, require no sign-up, and never send your inputs anywhere. The site is built and maintained by Gong Baolin at WisePath Technology LLC, and supported by unobtrusive advertising so it can stay free.