💪 Health & Fitness Calculators
Calculate BMI, BMR, daily calorie needs (TDEE), body fat percentage (US Navy method), ideal weight, daily water intake, macro splits (protein, carbs, fat), running pace with race time predictions, ovulation and fertile-window dates, weight-loss goal timelines, and pregnancy due dates.
BMI & BMR Calorie Calculator
Calculate BMI with WHO categories, BMR (Mifflin-St Jeor), daily calorie needs (TDEE), and weight-goal targets.
Open Calculator →Body Fat Percentage & Ideal Weight Calculator
Estimate body fat percentage with the US Navy circumference method, classify it by sex and age, and find ideal body weight with the Devine formula.
Open Calculator →Daily Water Intake Calculator
Calculate your daily water intake needs in liters, ounces, and cups based on body weight, activity level, climate, and pregnancy or breastfeeding status.
Open Calculator →Macro Calculator - Protein, Carbs & Fat Split
Split daily calories into protein, carbohydrate, and fat grams using body-weight ratios or percent splits, with meal-by-meal targets for cut, maintain, and bulk goals.
Open Calculator →Running Pace & Race Time Calculator
Calculate running pace per kilometer and mile, average speed, split times for 5K, 10K, half marathon, and marathon, and predicted race times from any recent effort.
Open Calculator →Pregnancy Due Date Calculator (Naegele's Rule)
Estimate your baby's due date from the last menstrual period or conception date using Naegele's rule, with gestational age, trimester timeline, and cycle-length adjustment.
Open Calculator →Ideal Weight Calculator (Devine, Robinson, Miller, Hamwi)
Find your ideal weight with the Devine, Robinson, Miller, and Hamwi formulas from height and sex, plus the healthy BMI weight band and current-weight comparison.
Open Calculator →Ovulation Calculator (Fertile Window & Cycle Dates)
Find your ovulation date, six-day fertile window, cycle status, and the next five period dates from your last period, cycle length, and luteal phase.
Open Calculator →Weight Loss Calculator (Goal Date & Calorie Deficit)
Turn a goal weight and weekly loss rate into a target date, required daily calorie deficit, pace-safety check, and BMI at your goal weight.
Open Calculator →TDEE Calculator (Daily Calories & Cut/Bulk Targets)
BMR via Mifflin-St Jeor, activity multiplier, and maintenance calories — then cut or bulk targets with weekly change projections and a safe-floor check.
Open Calculator →Steps to Miles Calculator (Stride & Distance)
Convert steps into miles or kilometers from your stride length, with walking time at your pace and steps-per-mile math for any daily step goal.
Open Calculator →BAC Calculator (Blood Alcohol Level & Sober Time)
Estimate blood alcohol concentration from standard drinks, body weight, sex, and elapsed time using the Widmark formula — with hours to zero and legal limit context.
Open Calculator →Comprehensive Guide to Health & Fitness Calculators
Explore our full suite of precision calculators for Health.
Frequently Asked Questions (Health)
BMI (Body Mass Index) measures weight relative to height (kg/m²) to classify underweight, healthy, overweight, or obese ranges. BMR (Basal Metabolic Rate) estimates the calories your body burns at complete rest to maintain vital functions.
A daily deficit of 500 calories below your TDEE typically produces about 0.5 kg (1 lb) of fat loss per week. Avoid going below 1,200 calories (women) or 1,500 calories (men) without medical supervision.