All Health Calculators
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BMI Calculator
Body Mass Index with WHO health context.
Health
Calorie Calculator
Daily calorie needs (TDEE) by activity level.
Health
Body Fat Calculator
Estimate body fat % using the US Navy method and BMI-based formula.
Health
Ideal Weight Calculator
Ideal body weight using Hamwi, Devine, Robinson and Miller formulas.
Health
Nutrition Calculator
Full nutritional breakdown — calories, protein, vitamins & minerals. Powered by USDA FoodData Central.
Health
Pregnancy Due Date Calculator
Estimate your baby's due date, current week, and trimester using Naegele's Rule.
Health
Water Intake Calculator
Daily hydration needs based on weight, activity level, and climate.
Health
Sleep Calculator
Find the ideal bedtime or wake-up time based on 90-minute sleep cycles.
Health
Blood Alcohol Content Calculator
Estimate BAC using the Widmark formula. Impairment level and time to sober up. Educational use only.
Health
Ovulation Calculator
Predict your fertile window, ovulation day and next period from your last period and average cycle length.
Health
Calorie Deficit Calculator
Daily calorie target to reach your goal weight using BMR + TDEE. Weeks-to-goal projection and macro split.
Health
Macro Calculator
Daily protein, carbs and fat split with cut/maintain/bulk presets and four split styles.
Health
VO2 Max Calculator
Estimate aerobic fitness from Cooper run, 1.5-mile run or resting heart rate, with age-adjusted ratings.
Health
Height Predictor
Predict a child's adult height using the mid-parental formula plus current growth extrapolation.
Health
Period Calculator
Predict your next 6 periods, fertile window and ovulation day from cycle data.
Health
Running Pace Calculator
Pace, time and distance for 5K, 10K, half-marathon and marathon. Min/km, min/mile, km/h.
Health
TDEE Calculator
Total Daily Energy Expenditure with BMR + cut/maintain/bulk targets.
Health
Protein Intake Calculator
Daily protein in grams by goal, with per-meal split and high-protein food sources.
Health
GLP-1 Weight Loss Calculator
Project weight loss on Wegovy, Ozempic, Mounjaro, Zepbound or Saxenda from clinical trial averages.
Health
Semaglutide & Tirzepatide Dose
mg → units conversion for compounded vials on a U-100 syringe + standard titration schedule.
About Our Health Calculators
All CalcWhizz health calculators are free, accurate and GDPR compliant. Calculations run entirely in your browser — no personal data is stored or shared. Formulas are independently reviewed by qualified professionals and updated annually.
Important Note: This tool is intended to provide estimates and should not be used as a substitute for professional advice. Information generated by these calculators may be incomplete and does not account for all individual circumstances. Always seek the counsel of a certified expert (such as a financial advisor, healthcare provider, or licensed engineer) before taking action based on these results.