Health
Health and fitness calculators for screening, training, nutrition, pregnancy, and workout planning, with practical limits and safety disclaimers built in.
Best for
Fast interactive calculations
Formula checks and worked assumptions
Related tools for the next step
Calculators
BMI Calculator
FeaturedCalculate your Body Mass Index and see your weight category.
bmi calculator
Open Calculator →Calorie Calculator
FeaturedCalorie and TDEE calculator. Find your Total Daily Energy Expenditure and BMR with Mifflin-St Jeor and Harris-Benedict equations, plus macronutrient breakdown for your caloric goals.
tdee calculator
Open Calculator →Heart Rate Zones Calculator
FeaturedCalculate your five heart rate training zones using standard (220 minus age) or Karvonen (heart rate reserve) methods.
heart rate zones calculator
Open Calculator →One Rep Max (1RM) Calculator
FeaturedEstimate your one-rep max from submaximal lifts using Epley, Brzycki, Lombardi, Mayhew, and Wathan formulas. Includes training load percentage chart.
one rep max calculator
Open Calculator →Pregnancy Calculator
FeaturedPregnancy and due date calculator. Estimate your due date from last menstrual period or conception date, with week-by-week pregnancy timeline.
due date calculator
Open Calculator →Pace Calculator
Calculate running pace, time, or distance. Enter any two values to find the third, with split times for your run.
pace calculator
Open Calculator →Protein Intake Calculator
Calculate your daily protein target based on body weight, activity level, and fitness goal. Per-meal breakdown included.
protein intake calculator
Open Calculator →Body Fat Calculator
Estimate your body fat percentage using the US Navy circumference method. Shows fat category, lean body mass, and fat mass.
body fat calculator
Open Calculator →FAQ
Which calculator should I open first?
Start with the calculator that matches the quantity you need to solve, then use the related tools to check adjacent assumptions such as unit conversion, power, cost, or percentage change.
Are these calculators meant for final professional decisions?
They are educational and estimation tools. Financial, health, and electrical calculators include disclaimers because real decisions may require licensed professional review.
Do the tools show the formula?
Calculator pages expose formulas, assumptions, examples, and related tools so you can verify the result instead of treating it as a black box.
Can I share a calculation?
Most calculators keep important inputs in the URL, so you can bookmark or share a configured calculation after entering values.