CalcTypes
Home / Calculators / Health & Fitness
❤️ Calculator category

Health & Fitness Calculators

Choose a subcategory or calculator below for inputs, results, formulas and clear working.

23 calculators
All items shown

All Health & Fitness calculators

This list updates automatically whenever calculators are added or reassigned.

BMI Calculator (Adult)BMI Prime Calculator (BMI ÷ 25) + Ponderal IndexBMR Calculator — Mifflin, Harris‑Benedict, Katch (kcal/kJ)Body Fat Calculator: US Navy Tape & BMI MethodsBody Fat Percentage CalculatorCalorie CalculatorCalorie Calculator for Kids & Teens (Child TDEE, Ages 2–18)Child BMI Calculator (BMI Percentile, Ages 2–19 — CDC Method)Child Height & Weight Percentile Calculator (CDC, Ages 2–19)Child Water Intake Calculator – Daily Fluids by AgeExercise Hydration Calculator – Before, During & AfterHarris Benedict BMR Calculator (Revised Equation)Ideal Body Weight (IBW) CalculatorKatch–McArdle BMR Calculator (Lean Body Mass / Body Fat %)Lean Body Mass Calculator (LBM) — Calculate Lean Mass From Body Fat %Mifflin–St Jeor BMR Calculator (Age, Sex, Height & Weight)Navy Body Fat Calculator (Tape Measure Method)Sweat Rate Calculator – Measure Fluid Loss Per HourTDEE CalculatorTeen BMI Calculator (BMI Percentile, Ages 13–19 — CDC Method)Waist-to-Height Ratio (WHtR) Calculator – Metric & US UnitsWaist-to-Hip Ratio Calculator (WHR)Water Intake Calculator – How Much Water Should You Drink Daily?

Related guides

View all 17 guides →
How to Calculate BMI Manually (Step-by-Step)Health & Fitness guide →BMI vs Body Fat Percentage: Which Matters More?Health & Fitness guide →Body Composition Guide: Body Fat %, BMI, Lean Mass & TDEE ExplainedHealth & Fitness guide →Body Fat Percentage Guide: What It Is, How to Measure It, and How to Use ItHealth & Fitness guide →How to Calculate BMR ManuallyHealth & Fitness guide →BMR vs RMR: What’s the Difference Between Basal and Resting Metabolic Rate?Health & Fitness guide →Ideal Weight vs Healthy Weight: What’s the Difference?Health & Fitness guide →What Is a Good BMR? How to Use Your Basal Metabolic Rate SafelyHealth & Fitness guide →
About these tools

Health calculators built on published equations

These calculators turn standard clinical and nutrition equations into quick estimates you can check. Adults can start with the BMI calculator, then look deeper with body fat, waist-to-height ratio and lean body mass. Energy needs come from the BMR calculator (Mifflin–St Jeor, Harris–Benedict or Katch–McArdle) and the TDEE and calorie calculators.

Children are not small adults, so they have their own tools. The CDC child and teen BMI calculator uses the official CDC BMI-for-age reference data, and the child TDEE calculator uses the 2023 National Academies energy equations. Hydration tools include water intake and sweat rate.

All results are screening estimates, not a diagnosis. Talk to a doctor, paediatrician or dietitian before acting on a result, especially for children, pregnancy or a medical condition.