Health without
the guessing
Explore medical insights, interactive health calculators, and clinical data to understand your options and make more informed decisions. "Probably Fine" is not good enough.
Health Calculators
Why track these metrics?
Knowing your baseline — BMI and Total Daily Energy Expenditure (TDEE) — is a good place to start when exploring medical weight loss. Providers use this data to help tailor medication dosage and nutritional guidance.
Go deeper than the scale
BMI tells part of the story. These clinician-referenced tools help you understand body composition, metabolic risk, and nutrition targets so you can have a more informed conversation with a licensed provider.
Ideal Body Weight
Uses the Devine formula (1974), the dosing standard referenced by the FDA for weight-based medications like GLP-1s.
Why these metrics matter
Ideal Body Weight guides medication dosing. Macro splits turn calorie targets into real meals. Waist-to-height ratio catches cardiometabolic risk BMI misses. Together they give your provider a fuller picture.
Editorial standard
Every formula here is sourced from peer-reviewed literature and reviewed by PRBLY's clinical team. These tools estimate — they don't diagnose. Always confirm with a licensed clinician.
The habits behind the numbers
Medication works best alongside hydration, sleep, and realistic expectations. These tools translate clinical research into daily targets you can actually track.
Daily Hydration Target
Estimates daily water intake from body weight and activity. The U.S. National Academies recommend ~3.7L (men) / ~2.7L (women) from all beverages and food.
Sleep Debt Tracker
Chronic sleep loss raises cortisol, blunts weight loss, and impairs glucose metabolism. The CDC recommends 7+ hours for adults.
GLP-1 Projection
Estimates expected weight loss on a GLP-1 medication based on pooled trial data (Wilding et al., NEJM 2021). Individual results vary significantly.
Clinical Data & Efficacy
Average Weight Loss Trajectory
GLP-1 Medications vs. Placebo over 6 months (% body weight lost)
Natural NAD+ Decline by Age
Relative cellular NAD+ levels across lifespan
Average Testosterone by Decade (Men)
Total testosterone (ng/dL) declines roughly 1% per year after age 30. Source: Travison et al., J Clin Endocrinol Metab.
How to read these charts
- Weight loss trajectory shows pooled GLP-1 trial averages vs. placebo — your individual result depends on dose, adherence, and lifestyle.
- NAD+ decline is relative to young-adult levels; supplementation aims to support cellular energy, not reverse aging.
- Testosterone trends are population averages. Symptoms — not a single lab value — guide whether TRT is appropriate.
Data summarized from peer-reviewed publications for educational use. See our editorial standard below for full source citations.
How we build resources you can trust
PRBLY follows Google's E-E-A-T principles — Experience, Expertise, Authoritativeness, and Trustworthiness — across every calculator, chart, and article. Here's the standard behind the numbers.
Clinically reviewed
Every calculator and data point on this page is checked against peer-reviewed sources by PRBLY's clinical team before publication.
Transparent methodology
We publish the formula, the source, and the limitation for each tool — so you know exactly what a number means and what it doesn't.
Tools, not diagnoses
These calculators estimate. They cannot replace a licensed clinician's evaluation, lab work, or a personalized treatment plan.
Sources cited on this page
Want a plan built around your numbers?
Bring your results to a quick medical intake. A licensed provider reviews your metrics and recommends whether a treatment like a GLP-1 or NAD+ makes sense for you.
Start Medical IntakeThe calculators and charts on this page are for educational purposes only and do not constitute medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any treatment. Individual results vary. See our editorial policy for details.
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