ganak.appHealth Calculators
17 calculators · Updated Mar 2026
Track and understand your health metrics with calculators for BMI, BMR, calorie intake, hydration, sleep cycles, and reproductive health. Results include personalized recommendations.
BMI, ideal weight, and body fat percentage estimation · Calorie, macro, and TDEE calculators for nutrition planning · Ovulation, pregnancy due date, and period tracking tools
Popular in Health
BMI Calculator
Calculate your Body Mass Index (BMI) using height and weight. Instantly find your BMI category (underweight, normal, overweight, obese) based on WHO and CDC standards. Includes BMI chart, healthy weight range, and personalized health recommendations. Supports metric (kg/cm) and imperial (lbs/inches) units.
Calorie Calculator
Free calorie calculator to find your daily calorie needs. Calculate maintenance calories, calorie deficit for weight loss, or surplus for muscle gain. Uses Mifflin-St Jeor and Katch-McArdle formulas. Includes BMR, TDEE, macronutrient breakdown, and goal-based calorie targets with weight change projections.
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) - the total calories you burn per day including all activities. Essential for weight loss (calorie deficit), weight gain (surplus), or maintenance. Uses BMR plus activity multipliers for sedentary, light, moderate, active, and very active lifestyles. Includes macronutrient recommendations.
All Health Calculators
Ideal Weight Calculator
Calculate your ideal body weight using multiple scientifically-validated formulas (Devine, Robinson, Miller, Hamwi). Find your healthy weight range based on height, age, frame size, and gender. Perfect for fitness goal setting, weight loss targets, and health assessments. Includes BMI-based recommendations and ideal weight ranges.
BMR Calculator
Calculate your Basal Metabolic Rate (BMR) - the calories your body burns at complete rest. Uses Mifflin-St Jeor and Harris-Benedict equations for accurate results. Essential for weight loss, muscle gain, and nutrition planning. Find your daily calorie needs with activity level multipliers for sedentary to very active lifestyles.
Body Fat Calculator
Estimate body fat percentage using the U.S. Navy method and BMI-based calculations. Compare fat mass vs lean mass, view your body composition category, and track fitness progress. Requires waist, neck, and hip measurements. Includes body fat category charts for men and women, plus healthy body fat ranges by age.
A1C Calculator
Convert A1C ↔ average glucose (eAG), estimate A1C from glucose readings, GMI, and fructosamine. Includes mg/dL ↔ mmol/L conversion, charts, and A1C range interpretation.
Sleep Calculator
Calculate optimal bedtime and wake-up times based on 90-minute sleep cycles. Find your ideal sleep schedule by age group with a sleep quality score, nap recommendations, and health impact analysis. Uses National Sleep Foundation guidelines with adjustable fall-asleep time. Includes sleep cycle stages, sleep duration by age chart, and sleep hygiene tips.
Water Intake Calculator
Calculate your daily water intake based on weight, activity level, climate, and exercise. Get a personalized hydration schedule with glasses, liters, and ounces. Includes hourly drinking plan, adjustment factors for caffeine and exercise, and evidence-based recommendations from IOM guidelines.
Calorie Deficit Calculator
Free calorie deficit calculator for weight loss. Enter your stats and goal weight to get your daily calorie target, deficit amount, and estimated timeline. Includes weight loss projection chart, macronutrient breakdown, 7-day calorie cycling plan, and multi-deficit comparison. Uses Mifflin-St Jeor and Katch-McArdle formulas.
Macro Calculator
Free macro calculator to find your ideal daily protein, carbs, and fat intake. Calculate macronutrients based on your body stats, activity level, and fitness goals. Choose from preset diet plans (Balanced, Low Carb, High Protein, Keto, Low Fat) or create custom macro ratios. Includes per-meal breakdown, diet plan comparison, and personalized protein recommendations. Uses Mifflin-St Jeor and Katch-McArdle formulas.
Ovulation Calculator
Free ovulation calculator to find your most fertile days and predict ovulation dates. Enter your last period date and cycle length to see a 6-month fertility calendar with estimated ovulation dates, fertile windows, and due dates if conceived. Includes cycle phase timeline, conception probability chart, and signs of ovulation. Supports irregular cycles (21-45 days).
Pregnancy Due Date Calculator
Free pregnancy due date calculator to estimate when your baby will arrive. Calculate your estimated due date using last menstrual period (LMP), conception date, IVF transfer date, or ultrasound. Includes gestational age, trimester timeline, pregnancy milestones, and week-by-week progress tracker. Uses Naegele's Rule with cycle-length adjustment. Supports irregular cycles (20-45 days).
Period Calculator
Free period calculator to predict your next period date, safe and unsafe days, fertile window, ovulation, and PMS timing. Enter your last period date, cycle length, and period duration for a 6-month cycle calendar with period predictions, safe period windows, and calendar export. Supports cycles from 21 to 45 days.
eGFR Calculator
Free eGFR calculator to estimate your kidney function using the CKD-EPI 2021, CKD-EPI 2009, MDRD, and Cockcroft-Gault equations. Enter serum creatinine, age, and sex for instant results with CKD staging (KDIGO G1–G5), risk classification, and all-equation comparison. Supports mg/dL and µmol/L creatinine units.
BAC Calculator
Free BAC calculator using the Widmark formula. Estimate your blood alcohol content by weight, gender, and drinks consumed. See your current BAC, peak BAC, time to sober, impairment level, and an interactive timeline chart. Includes standard drink calculator, effects at each BAC level, and legal limits.
Height Calculator
Predict your child's adult height using 3 scientific methods (Khamis-Roche, Mid-Parental, CDC multiplier). Check height percentile against CDC standards for any age and gender. Convert between cm, feet & inches, meters, and inches. Includes method comparison with confidence intervals, growth remaining, and percentile visualization.
Why Use Health Calculators?
Understanding your health numbers is the first step toward better decisions. These calculators use clinically-validated formulas to estimate your BMI, daily calorie needs, body fat percentage, and more. Each result comes with context — what the numbers mean, where you fall on the scale, and actionable recommendations tailored to your profile.