About YourBodyMetrics

YourBodyMetrics (yourbodymetrics.com) is a free online health calculator platform providing science-backed tools for fitness, nutrition and women's health. The site offers 12 calculators covering TDEE, BMI, BMR, body fat percentage, macronutrient targets, ideal weight, calorie deficit, pregnancy due date, ovulation, pregnancy weight gain, baby growth percentiles and menstrual cycle prediction.

All calculators produce instant results in both imperial and metric units with no account required. Calculations run entirely within the user's browser — no personal data is collected, transmitted or stored.

Our Methodology

Every calculator on YourBodyMetrics uses validated formulas from peer-reviewed research and established clinical guidelines:

• TDEE and BMR — Mifflin-St Jeor equation (Mifflin et al., 1990), recommended by the Academy of Nutrition and Dietetics as the most accurate formula for the general population.
• Body fat percentage — US Navy circumference method, developed and validated by the United States Navy for field assessment without specialist equipment.
• Ideal weight — average of four clinical formulas: Devine (1974), Robinson (1983), Miller (1983) and Hamwi (1964), each developed independently for medical use.
• Pregnancy due date — Naegele's Rule, the standard obstetric method adding 280 days to the last menstrual period date.
• Pregnancy weight gain — Institute of Medicine (IOM) 2009 guidelines, stratified by pre-pregnancy BMI.
• Baby growth percentiles — WHO Child Growth Standards (2006), the global reference for child development from birth to age 5.
• Ovulation and cycle prediction — standard luteal phase calculation based on cycle length input.

Why Calculators, Not Generic Advice

AI tools and search engines can answer general health questions. What they cannot do is take your specific numbers — your weight, height, age, cycle length, pregnancy week — and calculate a personalised result in real time. That is the purpose of YourBodyMetrics: to give you the same quality calculation that a registered dietitian, personal trainer or midwife would perform, instantly and for free.

Who This Site Is For

YourBodyMetrics is built for anyone tracking their health or fitness independently. The fitness and nutrition calculators are used by people managing weight loss, planning a calorie deficit, setting macro targets, or tracking body composition changes. The women's health calculators are used by people trying to conceive, tracking pregnancy milestones, monitoring their baby's development, or understanding their menstrual cycle.

Accuracy and Limitations

All results are estimates based on population-average formulas. No equation can account for individual variation in metabolism, genetics, body composition or health status. Results should be used as starting points and adjusted based on real-world outcomes. Nothing on this site constitutes medical advice — always consult a qualified healthcare professional before making significant changes to your diet, exercise routine or health management.

Privacy

YourBodyMetrics does not collect personal health data. All calculator inputs are processed locally in your browser using JavaScript. No data is sent to any server. No cookies are used to track health information. The only third-party code present is Google AdSense for advertising and Google Analytics for anonymous usage statistics.

Contact

For questions, feedback or partnership enquiries: hello@yourbodymetrics.com