71 Health Calculators
From BMI to pregnancy tracking, nutrition planning to fitness goals - all the health calculators you need in one place.
Instant Results
Get accurate health calculations in seconds
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Your data stays on your device, never stored
Medical Accuracy
Based on scientific research and medical standards
Easy to Use
Simple interface, professional results
All Categories
Use {count}+ free online health calculators: BMI, daily calorie needs, pregnancy due date, body fat percentage, macro tracker and more. Get instant science-backed results — no signup, 100% free!
Body & Weight
Free BMI, ideal weight, body fat percentage, lean body mass and waist-hip ratio calculators. Track your body composition with science-backed tools.
Fitness & Exercise
Calculate calories burned, one-rep max, running pace, VO2 max and daily step goals. Free fitness calculators for your workout planning.
Nutrition & Diet
Free calorie, macro, protein, TDEE and BMR calculators. Plan your meals, track calorie deficit and reach your nutrition goals with accurate tools.
Pregnancy & Birth
Calculate your due date, track pregnancy week by week, estimate fetal weight and predict baby gender. Free pregnancy calculators for expecting mothers.
Women's Health
Track your menstrual cycle, calculate ovulation days and monitor fertility windows. Free tools for hormonal health and reproductive planning.
Men's Health
Free PSA risk calculator and men's health screening tools. Monitor prostate health indicators and key fitness metrics with science-backed calculators.
Heart & Cardiovascular
Calculate target heart rate zones, check blood pressure ranges and assess cholesterol levels. Free cardiovascular health calculators for heart monitoring.
Diabetes & Blood Sugar
Convert HbA1c to average blood sugar, track glucose levels and manage diabetes with free online calculators. Instant, accurate results.
Medical Calculations
Calculate GFR, creatinine clearance, body surface area and life expectancy. Free clinical calculators based on validated medical formulas.
Mental Health
Screen for depression (PHQ-9), anxiety (GAD-7) and measure stress levels. Free, confidential mental health assessment tools with instant results.
Sleep & Rest
Find your ideal bedtime, calculate sleep cycles, track sleep debt and optimize rest quality. Free sleep calculators for better sleep hygiene.
Children's Health
Track child growth percentiles and predict adult height using WHO-standard charts. Free pediatric health calculators for parents and caregivers.
Daily Life
Calculate your exact age, find your blood type compatibility, check pet age in human years and discover fun health insights. Free everyday tools.
Substance & Alcohol
Calculate blood alcohol content (BAC), track caffeine intake, count alcohol calories and plan smoking cessation. Free substance awareness tools.
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No sign-up, no data leaves your browser, every formula has a public source.
What you get on ProHealthCalc
71+ calculators across 14 health categories — BMI, daily calorie needs (TDEE), body fat, due date, ovulation, A1C, GFR, PHQ-9, and more. Each one runs in your browser, returns a result in under a second, and shows the formula and the source it came from (WHO, CDC, NIH, AHA, peer-reviewed studies).
Each calculator page includes the formula in plain language, an example calculation, what the result means, when it does not apply (athletes, pregnancy, elderly, ethnic-specific cut-offs), and links to the original guidelines. We do not collect what you type — calculations happen on your device, no account, no tracking of inputs.
These tools are for self-education. They are not a substitute for a doctor, a diagnosis, or a treatment plan. If a result concerns you, talk to a clinician who can see your full history.