# Health Calculators

- **URL:** https://codeasystem.com/calculators/health/
- **Markdown index:** https://codeasystem.com/calculators/health/index.md
- **Calculators in this category:** 11

Health calculators for BMI, BMR, TDEE, macros, body fat, ideal weight, hydration and pregnancy due dates.

Focus areas: BMI, calories, body composition and pregnancy dates.

## All calculators
- [BMI Calculator](https://codeasystem.com/calculators/health/bmi-calculator.md); Calculate your Body Mass Index from weight and height in metric or imperial units, with WHO categories and the healthy weight range for your height.
- [BMR Calculator](https://codeasystem.com/calculators/health/bmr-calculator.md); Estimate your basal metabolic rate; the calories your body burns at complete rest; using Mifflin-St Jeor with a revised Harris-Benedict comparison.
- [TDEE Calculator](https://codeasystem.com/calculators/health/tdee-calculator.md); Work out your total daily energy expenditure from BMR and activity level; the calories needed to maintain your current weight.
- [Calorie Deficit Calculator](https://codeasystem.com/calculators/health/calorie-deficit-calculator.md); Turn your TDEE into a daily calorie target for fat loss, with expected weekly and monthly progress at your chosen deficit.
- [Macro Calculator](https://codeasystem.com/calculators/health/macro-calculator.md); Split your daily calories into carbohydrate, protein and fat gram targets using adjustable percentages and standard energy densities.
- [Protein Intake Calculator](https://codeasystem.com/calculators/health/protein-intake-calculator.md); Find your daily protein target from body weight and activity level, comparing the RDA baseline with evidence-backed ranges for active adults.
- [Body Fat Calculator](https://codeasystem.com/calculators/health/body-fat-calculator.md); Estimate body fat percentage with the US Navy circumference method using height, neck and waist measurements (plus hips for women).
- [Ideal Weight Calculator](https://codeasystem.com/calculators/health/ideal-weight-calculator.md); See ideal body weight estimates from the Devine and Robinson clinical formulas for your height and sex, presented side by side in kilograms.
- [Water Intake Calculator](https://codeasystem.com/calculators/health/water-intake-calculator.md); Estimate daily fluid needs from body weight plus exercise minutes, using a 33 ml/kg baseline with additions for training sweat loss.
- [Pregnancy Due Date Calculator](https://codeasystem.com/calculators/health/pregnancy-due-date-calculator.md); Estimate your due date from the first day of your last menstrual period using Naegele’s rule, plus your current gestational week and trimester.
- [Waist-to-Height Ratio Calculator](https://codeasystem.com/calculators/health/waist-to-height-ratio-calculator.md); Check your waist-to-height ratio against the WHO 0.5 boundary to assess central adiposity; a stronger cardiometabolic signal than BMI alone.

Each link above points to the full Markdown reference for that calculator (inputs, formula, worked example, FAQs). The interactive HTML version lives at the same path without the `.md` suffix.

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Last updated: 2026-08-23 · [Section overview](https://codeasystem.com/calculators/index.md)