ganak.appHealth Calculators
34 calculators · Updated Apr 2026
Track and understand your health metrics with calculators for BMI, BMR, calorie intake, hydration, sleep cycles, and reproductive health. Results include personalized recommendations.
Popular in Health
BMI Calculator
Free BMI calculator with WHO 8-category classification. Get BMI, BMI Prime, healthy weight range, and weight-to-goal. Ethnicity-adjusted thresholds included.
Calorie Calculator
Free calorie calculator. Find daily calorie needs for weight loss, maintenance, or gain. Includes BMR, TDEE, macros, and goal-based targets with projections.
TDEE Calculator
Free TDEE calculator. Calculate total calories burned per day with personalized targets for weight loss, gain, or maintenance. Includes macro breakdown.
All Health Calculators
Ideal Weight Calculator
Calculate ideal body weight using BMI ranges and clinical formulas (Devine, Robinson, Miller, Hamwi). Personalized by gender and frame size.
BMR Calculator
Calculate BMR and TDEE using Mifflin-St Jeor and Katch-McArdle equations. Get calorie targets for weight loss, maintenance, or gain with macro breakdown.
Body Fat Calculator
Free body fat calculator using U.S. Navy and BMI methods. Enter neck, waist, and hip measurements for body fat %, fat mass, lean mass, and fitness category.
A1C Calculator
Convert A1C to average glucose (eAG), estimate GMI and fructosamine. Includes mg/dL to mmol/L conversion, charts, and A1C range interpretation.
Sleep Calculator
Calculate optimal bedtime and wake-up times based on 90-minute sleep cycles. Get sleep quality score, nap recommendations, and age-based sleep guidelines.
Water Intake Calculator
Calculate daily water intake based on weight, activity, and climate. Get a personalized hydration schedule in glasses, liters, and ounces with hourly plan.
Calorie Deficit Calculator
Free calorie deficit calculator. Enter stats and goal weight to get daily calorie target, deficit amount, timeline, and weight loss projection chart.
Macro Calculator
Free macro calculator. Find your ideal daily protein, carbs, and fat based on body stats and goals. Preset plans: Balanced, Low Carb, Keto, and more.
Ovulation Calculator
Free ovulation calculator. Enter last period date and cycle length for a 6-month fertility calendar with ovulation dates, fertile windows, and due dates.
Pregnancy Due Date Calculator
Free pregnancy due date calculator. Estimate your due date from LMP, conception, IVF, or ultrasound. Includes gestational age and trimester timeline.
Pregnancy Week Calculator
Free pregnancy week calculator. Find how many weeks pregnant you are with baby size, symptoms, and milestones. Calculate by LMP, conception, IVF, or due date.
Period Calculator
Free period calculator. Predict your next period, safe days, fertile window, and ovulation. 6-month cycle calendar with predictions for 21–45 day cycles.
Creatinine Clearance Calculator
Calculate creatinine clearance (CrCl) using Cockcroft-Gault with automatic IBW/ABW selection. Includes renal function classification and drug dosing thresholds.
eGFR Calculator
Free eGFR calculator using CKD-EPI 2021, MDRD, and Cockcroft-Gault equations. Get CKD staging (G1–G5), risk classification, and all-equation comparison.
QTc Calculator
Free QTc calculator using Bazett, Fridericia, Framingham, Hodges & Rautaharju. Enter heart rate and QT interval for corrected QT with risk scale.
BAC Calculator
Free BAC calculator using the Widmark formula. Estimate blood alcohol content by weight, gender, and drinks. See current BAC, peak BAC, and time to sober.
Height Calculator
Predict child's adult height using Khamis-Roche, Mid-Parental, and CDC methods. Check percentile against CDC standards and convert between units.
Life Expectancy Calculator
Calculate estimated life expectancy based on age, gender, country, and lifestyle habits. Includes survival curve, health age, and factor impact breakdown.
Waist to Height Ratio Calculator
Calculate waist-to-height ratio (WHtR) and check health risk. Better than BMI for cardiometabolic risk. Get Ashwell category and ideal waist target.
FFMI Calculator
Calculate FFMI to assess muscularity and natural genetic potential. Get normalized FFMI, body composition breakdown, and classification category.
Blood Pressure Calculator
Free blood pressure calculator with AHA classification, Mean Arterial Pressure (MAP), pulse pressure analysis, and hypertensive crisis detection. Home and clinic thresholds.
MAP Calculator
Free MAP calculator with instant results. Calculate Mean Arterial Pressure from systolic and diastolic BP. Includes pulse pressure, BP classification, and clinical interpretation.
Peptide Calculator
Free peptide calculator. Calculate reconstitution dosage, syringe units, and concentration from vial size and BAC water. See doses per vial and days supply.
CHA₂DS₂-VASc Calculator
Free CHA₂DS₂-VASc calculator for AF stroke risk. Get score, annual stroke rate, and anticoagulation guidance per 2023 ACC/AHA. Includes HAS-BLED.
Weight Loss Calculator
Free weight loss calculator. Enter your details and goal weight to get a personalized calorie target, timeline, weight loss percentage, and weekly milestones.
Conception Calculator
Free conception date calculator. Estimate when you conceived using your last period, due date, ultrasound, or birth date. Shows the fertile window.
ASCVD Risk Calculator
Free ASCVD risk calculator using the 2013 Pooled Cohort Equations. Estimate your 10-year heart attack and stroke risk, heart age, lifetime risk, and what-if scenarios for risk reduction.
Anion Gap Calculator
Free anion gap calculator with albumin correction, delta-delta ratio, and urine AG. Supports standard and 4-ion formulas with instant clinical interpretation.
Caffeine Half Life Calculator
Free caffeine half-life calculator. See how long caffeine stays in your body hour by hour with 24+ drink presets, metabolism types, decay chart, and sleep impact analysis.
Blood Type Calculator
Free blood type calculator. Predict your child's blood type from parents using Punnett square genetics. See ABO and Rh factor probabilities, genotype breakdown, and transfusion compatibility chart.
Sleep Debt Calculator
Free sleep debt calculator. Log your daily sleep, get age-based recommendations (NSF guidelines), calculate weekly sleep debt, efficiency score, and a personalized recovery plan.
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.