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Built to help you
know your numbers.

BetterBodySuite is a free collection of science-backed health and body calculators — built for anyone who wants clear, accurate information without the noise.

Our mission

Most health calculator sites are cluttered, inaccurate, or designed to upsell you on supplements. We built BetterBodySuite to be the opposite — clean, free, and genuinely useful.

Every tool on this site uses the same formulas that doctors, dietitians, and certified trainers use — presented clearly so you can actually understand and act on your results.

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Science-backed
Every formula is sourced from peer-reviewed research and established clinical guidelines.
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Private by design
All calculations happen in your browser. We never store or share your personal health data.
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No friction
No sign-up, no email, no loading screens. Enter your numbers and get your answer.
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Free forever
Core calculators are free forever. Pro AI features are optional for those who want more.

Our expert reviewer

Every formula, methodology, and result interpretation on BetterBodySuite has been reviewed and approved by a certified health professional.

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Daniel J. D'Alessandro
Certified Personal Trainer (CPT) Certified Nutrition Coach

Daniel reviews all formulas, reference ranges, and tool outputs on BetterBodySuite to ensure they reflect current best practices in exercise science and nutrition. His involvement means you can trust that the numbers you see are accurate, evidence-based, and appropriate for general wellness use.

Formulas & sources

We use the most widely accepted and rigorously tested formulas available. Here's what powers each tool:

BMIWorld Health Organization (WHO) standard formula
BMR / TDEEMifflin-St Jeor (1990) — most accurate for general population
Ideal weightHamwi (1964), Devine (1974), Robinson (1983), Miller (1983)
Body fat %U.S. Navy Body Fat Formula
Macro targetsISSN Position Stand on protein & exercise (2017)
Due dateNaegele's Rule — standard obstetric calculation
Pregnancy weight gainInstitute of Medicine (IOM) 2009 guidelines
Water intakeNational Academies of Sciences, Engineering & Medicine (NASEM)
Calorie deficit3,500 cal per lb of fat — standard clinical estimation

Contact

Questions, feedback, or corrections? We take accuracy seriously and welcome any input from health professionals or users who spot something that needs updating.

Reach us at [email protected]