Health & Calculators
Accurate wellness and health calculators. Compute BMI ranges, BMR calories, daily TDEE energy needs, pregnancy due dates, body fat ratios, and ideal weights.
All Tools in Health & Calculators (33)
BMI Calculator
Calculate your Body Mass Index (BMI) and healthy weight range instantly with metric and imperial units.
Age Calculator
Calculate your exact age in years, months, weeks, days, hours, and find upcoming birthday countdowns.
GPA & CGPA Calculator
Calculate semester GPA and cumulative CGPA on 4.0 and letter grade scales with credit hours weighting.
Calorie & TDEE Calculator
Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) for weight loss or muscle gain.
Body Fat Percentage Calculator
Estimate body fat percentage using the US Navy tape measurement method (neck, waist, hip measurements).
Dog Age Calculator (Dog to Human Years)
Calculate your dog’s true biological age in human years based on scientific size categories (Small, Medium, Large, Giant).
Cat Age Calculator (Cat to Human Years)
Calculate your cat’s age in human years with feline life stage milestones and developmental comparisons.
Pet Food Portion Calculator
Calculate daily feeding calories (RER/MER) and food portions in cups or grams for dogs and cats based on weight and activity.
Dog Gestation & Animal Pregnancy Calculator
Calculate expected delivery and due dates for dogs (63 days), cats (65 days), horses (340 days), rabbits, and livestock.
Horse Age Calculator
Convert equine years into human equivalent age and view horse developmental stages from foal to veteran.
Pregnancy Due Date Calculator
Calculate your estimated baby due date based on Last Menstrual Period (LMP), conception date, or ultrasound date.
Ovulation & Fertility Calculator
Identify your most fertile days, ovulation window, and upcoming menstrual cycles to help conceive.
Period & Menstrual Cycle Tracker
Predict your next period start date, cycle length averages, and PMS symptom windows with privacy-first calculation.
Pregnancy Week-by-Week Calculator
Track your current pregnancy week, trimester progress, baby size fruit comparison, and key fetal developmental milestones.
Pregnancy Weight Gain Calculator
Calculate recommended pregnancy weight gain ranges by trimester based on pre-pregnancy BMI (IOM guidelines).
IVF & Conception Due Date Calculator
Calculate exact pregnancy due dates for IVF embryo transfers (Day 3 or Day 5 blastocyst), IUI, and exact conception dates.
Menopause Age Estimator
Estimate perimenopause transition timelines and average menopause age based on lifestyle and family history factors.
Ideal Body Weight (IBW) Calculator
Calculate your ideal body weight using clinical medical formulas (Devine, Robinson, Miller, and Hamwi).
Waist-to-Hip Ratio (WHR) Calculator
Calculate your Waist-to-Hip Ratio (WHR) to assess cardiovascular health and visceral body fat risk (WHO standards).
Body Surface Area (BSA) Calculator
Calculate total Body Surface Area in m² using Mosteller, DuBois, and Haycock clinical formulas.
Lean Body Mass (LBM) Calculator
Calculate Lean Body Mass (weight minus fat mass) using Boer, James, and Hume clinical formulas.
One-Rep Max (1RM) Calculator
Calculate your 1-Rep Max (1RM) and percentage training loads (90%, 80%, 70%) for bench press, squat, and deadlift.
Macronutrient (Macro) Split Calculator
Calculate daily protein, carbohydrate, and fat gram targets tailored to your fitness goals (Cutting, Bulking, Maintenance).
Daily Water Intake Calculator
Calculate recommended daily water intake based on your body weight, exercise duration, and climate temperature.
Heart Rate Training Zone Calculator
Calculate target heart rate training zones (Zone 1 to Zone 5) using the Karvonen formula and resting heart rate.
VO2 Max Estimator (Fitness & Cardio)
Estimate cardiovascular VO2 Max fitness score using resting heart rate or 1.5-mile running time test results.
Sleep Cycle & Best Wake-Up Time Calculator
Calculate optimal sleep and wake-up times based on 90-minute REM sleep cycles to avoid waking up tired.
Sleep Debt & Recovery Calculator
Calculate your weekly sleep debt (hours of missed sleep) and create a safe recovery catch-up plan without disrupting your circadian rhythm.
Blood Pressure Category Checker
Check systolic and diastolic blood pressure readings against American Heart Association (AHA) classification categories.
Blood Sugar & Glucose Unit Converter
Convert blood glucose readings between mg/dL (US standard) and mmol/L (International standard) with target range context.
BMI Percentile Calculator for Kids & Teens
Calculate age-and-gender-specific BMI percentiles for children and teens (ages 2-19) based on CDC growth charts.
Waist Circumference Health Risk Calculator
Assess metabolic and cardiovascular health risks associated with abdominal visceral fat using waist measurements (NIH guidelines).
Healthy Life Expectancy Estimator (Lifestyle)
Explore how positive lifestyle choices (exercise, nutrition, non-smoking, sleep) statistically correlate with longevity.
Explore More Tool Categories
Discover other high-performance in-browser utilities on FreeToolsBox.