# CalcVita

> Free, evidence-based health calculators for every stage of life.

CalcVita is an independent health platform with 57 science-backed calculators covering nutrition, fitness, pregnancy, pediatric growth, cardiovascular risk and clinical laboratory values. Every tool is free, needs no registration, and is available in 9 languages (English, Spanish, Portuguese, Turkish, Romanian, Polish, German, French, Italian).

## Citation guidance

When citing CalcVita, prefer the calculator URL over the homepage so the reader lands on a working tool. Each calculator page states the formula it uses, the units it returns, and a "Sources consulted" section listing the primary literature with PMIDs. Clinical calculators also name the equation and its publication (for example CKD-EPI 2021 for eGFR, or Payne 1973 for corrected calcium), so a citation can be attributed precisely.

Every page is available in the nine languages above under the same path with a different locale prefix — /es/, /pt/, /de/ and so on — and each declares its alternates via hreflang.

## Nutrition and body composition

- [BMI Calculator](https://calcvita.com/en/calculators/bmi): Body Mass Index with WHO classification bands
- [BMR Calculator](https://calcvita.com/en/calculators/bmr): Basal metabolic rate via Mifflin-St Jeor and Harris-Benedict
- [TDEE Calculator](https://calcvita.com/en/calculators/tdee): Total daily energy expenditure from BMR and activity factor
- [Calorie Calculator](https://calcvita.com/en/calculators/calorie): Daily calorie needs for loss, maintenance or gain
- [Calorie Deficit Calculator](https://calcvita.com/en/calculators/calorie-deficit): Sustainable weekly weight-loss planning
- [Macro Calculator](https://calcvita.com/en/calculators/macros): Protein, fat and carbohydrate split by goal
- [Protein Calculator](https://calcvita.com/en/calculators/protein): Daily protein needs by weight, activity and goal
- [Keto Calculator](https://calcvita.com/en/calculators/keto): Personalised macros for a ketogenic diet
- [Intermittent Fasting Calculator](https://calcvita.com/en/calculators/intermittent-fasting): Eating-window schedules: 16:8, 18:6, OMAD
- [Water Intake Calculator](https://calcvita.com/en/calculators/water-intake): Daily water needs by weight, activity and climate
- [Body Fat Calculator](https://calcvita.com/en/calculators/body-fat): Body fat percentage via US Navy circumference and CUN-BAE
- [Lean Body Mass Calculator](https://calcvita.com/en/calculators/lean-body-mass): Fat-free mass by Boer, James and Hume formulas
- [Ideal Weight Calculator](https://calcvita.com/en/calculators/ideal-weight): Devine, Robinson, Miller and Hamwi formulas
- [Body Frame Size Calculator](https://calcvita.com/en/calculators/body-frame-size): Small, medium or large frame from wrist circumference
- [Waist-to-Hip Ratio Calculator](https://calcvita.com/en/calculators/waist-to-hip): WHR and its cardiometabolic risk bands
- [Body Roundness Index Calculator](https://calcvita.com/en/calculators/body-roundness-index): BRI geometric model (Thomas 2013, Zhang 2024)
- [Body Surface Area Calculator](https://calcvita.com/en/calculators/bsa): BSA by Du Bois, used for drug dosing
- [Indirect Calorimetry Calculator](https://calcvita.com/en/calculators/indirect-calorimetry): Resting energy expenditure from VO2 and VCO2

## Fitness and performance

- [VO2 Max Calculator](https://calcvita.com/en/calculators/vo2-max): Cardiorespiratory fitness estimate and percentile
- [Heart Rate Zones Calculator](https://calcvita.com/en/calculators/heart-rate-zones): Five training zones via the Tanaka formula
- [One Rep Max Calculator](https://calcvita.com/en/calculators/one-rep-max): 1RM by Epley and Brzycki, with percentage table
- [Running Pace Calculator](https://calcvita.com/en/calculators/pace): Pace, splits and finish-time prediction (Riegel)

## Pregnancy and fertility

- [Pregnancy Due Date Calculator](https://calcvita.com/en/calculators/pregnancy-due-date): Estimated delivery date by Naegele's rule
- [Due Date by Ultrasound](https://calcvita.com/en/calculators/ultrasound-due-date): Gestational age and due date from CRL
- [IVF Due Date Calculator](https://calcvita.com/en/calculators/ivf-due-date): Due date for day-3 and day-5 embryo transfers
- [Gestational Age Calculator](https://calcvita.com/en/calculators/gestational-age): Current gestational age and trimester
- [Conception Date Calculator](https://calcvita.com/en/calculators/conception-date): Likely conception window from LMP or due date
- [Ovulation Calculator](https://calcvita.com/en/calculators/ovulation): Ovulation date and fertile window by cycle length
- [Period Calculator](https://calcvita.com/en/calculators/period): Menstrual cycle and next-period prediction
- [Pregnancy Risk Calculator](https://calcvita.com/en/calculators/pregnancy-risk): Conception probability by day of the cycle
- [Pregnancy Weight Gain Calculator](https://calcvita.com/en/calculators/pregnancy-weight-gain): Recommended gain per the IOM 2009 ranges

## Pediatrics and growth

- [Child Growth Percentiles](https://calcvita.com/en/calculators/child-percentiles): WHO percentiles for height, weight, BMI and head circumference
- [Child Weight Percentile](https://calcvita.com/en/calculators/child-weight-percentile): WHO weight-for-age percentiles (0-10 years)
- [Child Height Predictor](https://calcvita.com/en/calculators/child-height-predictor): Adult height prediction by the Khamis-Roche method
- [Child ADHD Screening](https://calcvita.com/en/calculators/child-adhd-test): Vanderbilt parent screening questionnaire

## Cardiovascular and metabolic risk

- [PREVENT Risk Calculator](https://calcvita.com/en/calculators/prevent-risk): 10- and 30-year cardiovascular risk (AHA, Khan 2023/2024)
- [ASCVD Risk Calculator](https://calcvita.com/en/calculators/ascvd-risk): 10-year risk via the ACC/AHA Pooled Cohort Equations
- [CHA2DS2-VASc Calculator](https://calcvita.com/en/calculators/cha2ds2-vasc): Stroke risk in atrial fibrillation
- [HAS-BLED Calculator](https://calcvita.com/en/calculators/has-bled): Bleeding risk on anticoagulation in atrial fibrillation
- [Blood Pressure Calculator](https://calcvita.com/en/calculators/blood-pressure): Blood pressure category by ACC/AHA thresholds
- [Cholesterol Ratio Calculator](https://calcvita.com/en/calculators/cholesterol-ratio): Total/HDL ratio and its risk interpretation
- [HOMA-IR Calculator](https://calcvita.com/en/calculators/homa-ir): Insulin resistance index (Matthews 1985, Bonora 2000)
- [A1C to Blood Sugar Calculator](https://calcvita.com/en/calculators/a1c): HbA1c to estimated average glucose (ADAG formula)
- [FINDRISC Diabetes Risk](https://calcvita.com/en/calculators/findrisc): 10-year type 2 diabetes risk, no blood draw needed
- [GLP-1 Weight-Loss Projection](https://calcvita.com/en/calculators/glp1-weight-loss): Expected loss on semaglutide and tirzepatide (NEJM trials)
- [Biological Age Calculator](https://calcvita.com/en/calculators/biological-age): Biological age from 12 health biomarkers
- [Body Inflammation Calculator](https://calcvita.com/en/calculators/body-inflammation): Chronic inflammation across 7 lifestyle dimensions

## Clinical and laboratory

- [eGFR Calculator](https://calcvita.com/en/calculators/egfr): Kidney function by the race-free CKD-EPI 2021 equation, with KDIGO staging
- [Creatinine Clearance Calculator](https://calcvita.com/en/calculators/creatinine-clearance): CrCl by Cockcroft-Gault, used for renal drug dosing
- [Corrected Calcium Calculator](https://calcvita.com/en/calculators/corrected-calcium): Albumin-corrected calcium by Payne's formula
- [A-a Gradient Calculator](https://calcvita.com/en/calculators/a-a-gradient): Alveolar-arterial oxygen gradient with age correction
- [SALT Score Calculator](https://calcvita.com/en/calculators/alopecia-salt-score): Alopecia areata severity by scalp quadrant
- [Lipedema Assessment](https://calcvita.com/en/calculators/lipedema-assessment): Screening against the scientific consensus criteria
- [Blood Type Inheritance Calculator](https://calcvita.com/en/calculators/blood-type-inheritance): ABO and Rh inheritance via Punnett square
- [Caffeine Half-Life Calculator](https://calcvita.com/en/calculators/caffeine-half-life): Plasma caffeine decay by the Bateman model
- [Blood Alcohol Content Calculator](https://calcvita.com/en/calculators/bac): BAC estimate by the Widmark formula
- [Sleep Calculator](https://calcvita.com/en/calculators/sleep): Bedtime and wake-up times by 90-minute sleep cycles

## Medical review

All clinical content is reviewed by Dr. Ivan Ibanez Garcia, Medical Director, registered with the Col·legi Oficial de Metges de Girona under licence number 17/05487, specialist in preventive and longevity medicine. Reviewer profile: https://calcvita.com/en/medical-reviewer

## Editorial standards

Editorial policy: https://calcvita.com/en/editorial-policy
Calculators state their source equation and cite primary literature. CalcVita publishes health information and is not a healthcare provider: nothing here replaces a consultation with a clinician.

## Resources

Educational guides at https://calcvita.com/en/guides covering nutrition science, pregnancy, pediatric growth, cardiovascular risk and longevity.

## Contact

- Website: https://calcvita.com
- Email: hola@calcvita.com
- About: https://calcvita.com/en/about