HealthCalc Δ — Universal Health Calculator

All-in-one health calculator: BMI, ideal weight, BMR & calories, body fat, water intake, heart rate zones, waist-to-height ratio and sleep duration guide.

Select a mode, enter known values and press “Calculate”.

Note: This calculator uses simplified health formulas and provides approximate values for educational purposes only. It is not a medical tool or professional advice.

HealthCalc Δ — All-in-One Health & Fitness Calculator

HealthCalc Δ is a universal health and fitness calculator that combines several essential tools in one place. It helps you quickly estimate body mass index, ideal weight, daily calories, body fat level, hydration needs, heart rate zones, waist-to-height ratio and recommended sleep duration.

What you can calculate here

  • BMI — Body Mass Index — calculates BMI from height and weight and shows body weight category (underweight, normal, overweight or obesity).
  • Ideal weight — estimates a target body weight based on height and sex using simple clinical formulas, plus an approximate healthy range.
  • BMR & daily calories (TDEE) — calculates basal metabolic rate and estimated daily calorie needs depending on age, sex, height, weight and activity level.
  • Body fat percentage — uses the U.S. Navy method and body measurements (waist, neck, hip, height) to estimate body fat %.
  • Daily water intake — provides a suggested daily water amount based on body weight and activity level.
  • Max heart rate & zones — estimates maximum heart rate from age and shows basic training zones (50–100% of HRmax) in beats per minute.
  • Waist-to-height ratio — calculates WHtR and gives a simple interpretation of health risk related to abdominal fat.
  • Sleep duration guide — suggests a healthy nightly sleep range in hours according to age.

How to use

1. Select the calculator mode from the dropdown list at the top.
2. Enter the required values in the input fields (age, height, weight, measurements, etc.).
3. Click “Calculate” to see the result with key numbers and a short interpretation.

This calculator provides approximate health and fitness values for education and self-monitoring. It does not replace professional medical diagnostics, treatment or personal advice from a doctor or nutritionist.

Scroll to Top