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VitalMetrics

About VitalMetrics

Your trusted source for health and fitness calculations

Our Mission

VitalMetrics was created to provide everyone with free, instant access to essential health and fitness calculators. We believe that understanding your body's metrics should be simple, private, and accessible to all—no account required, no data collection, and no hidden costs.

Our privacy-first approach means all calculations happen directly in your browser. Your health data never leaves your device, ensuring complete privacy and instant results. We're committed to making health information accessible while respecting your right to privacy.

Our Calculators

Body Metrics

Pregnancy & Fertility

Fitness & Nutrition

Tools

Calculation Methodology & Scientific References

All our calculators use scientifically proven formulas and medical standards recognized by health organizations worldwide. We're committed to accuracy and regularly update our calculations based on the latest health guidelines. Below you'll find detailed information about each formula and its scientific backing.

BMI Calculator

Uses the standard BMI formula (weight in kg / height in m²) established by Adolphe Quetelet in the 1830s. Recognized by the WHO and CDC as a screening tool for weight categories.

Reference: CDC - Body Mass Index (BMI)

Calorie Calculator

Based on the Mifflin-St Jeor equation (1990), validated as the most accurate formula for calculating basal metabolic rate (BMR) in healthy adults. TDEE is calculated by multiplying BMR by activity factors.

Reference: Mifflin et al. (1990) - Am J Clin Nutr

Macro Calculator

Calculates optimal protein (0.8-2.0 g/kg), carbohydrate, and fat distribution based on your goals, activity level, and total daily energy expenditure following ISSN and AND guidelines for athletes and active individuals.

Reference: ISSN Position Stand: Protein and Exercise (2017)

Body Fat Calculator

Uses the U.S. Navy circumference method developed by Hodgdon and Beckett (1984), a validated approach for estimating body composition using neck, waist, and hip measurements.

Reference: Hodgdon & Beckett (1984) - Naval Health Research Center

Pregnancy Calculator

Follows Naegele's Rule (LMP + 280 days) for due date calculation, the standard method used by healthcare providers worldwide. Developed by Franz Karl Naegele in the early 1800s and still widely used today.

Reference: ACOG - Methods for Estimating the Due Date (2017)

Ovulation Calculator

Uses the standard ovulation prediction method (next period start - 14 days) based on menstrual cycle length to identify the 6-day fertile window, following evidence from fertility research.

Reference: ACOG - Fertility Awareness-Based Methods

Ideal Weight Calculator

Incorporates multiple evidence-based formulas including Robinson (1983), Miller (1983), Devine (1974), and Hamwi (1964) to provide a comprehensive healthy weight range based on height and frame.

Reference: Peterson et al. (2016) - BMC Obesity

Water Intake Calculator

Based on body weight, activity level, and climate factors using evidence-based hydration guidelines from the National Academies of Sciences (30-35 mL/kg body weight baseline).

Reference: National Academies - Dietary Reference Intakes for Water

Note: All external links open in a new tab and are provided for educational purposes. We regularly review and update our methodologies to reflect the latest scientific consensus.

Why Trust VitalMetrics?

100% Private

All calculations happen in your browser. We don't collect, store, or share any of your health data.

Always Free

No subscriptions, no hidden fees, no premium features. All calculators are 100% free forever.

Scientifically Accurate

We use proven formulas and medical standards backed by scientific research and health organizations.

Mobile-Optimized

All calculators work seamlessly on any device—desktop, tablet, or smartphone.

Instant Results

No waiting, no processing. Get immediate results as you enter your information.

No Account Needed

Jump right in and start calculating. No sign-up, no login, no hassle.

Medical Disclaimer

VitalMetrics provides health and fitness calculators for informational and educational purposes only. Our calculators are not intended to diagnose, treat, cure, or prevent any disease or medical condition. The results should not be considered a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or health goals. Never disregard professional medical advice or delay in seeking it because of information obtained from VitalMetrics.

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