Wellness tools
Simple calculators for everyday health literacy. Soft estimates only — not diagnosis, treatment, or medication dosing.
BMI calculator
Estimate body mass index with a plain-language range explainer.
Waist-to-height ratio
Compare waist and height as another educational body-measure lens.
Unit converter
Convert lb↔kg and cm↔in for everyday measurements.
Hydration estimate
A soft starting estimate for daily fluids.
Protein intake estimate
Soft daily protein ranges by weight and activity style.
Calorie needs estimate
Rough daily energy needs using a common metabolism equation.
Heart-rate zones
Estimate training zones from age using a common rule of thumb.
Walking pace calculator
Find pace or finish time for miles or kilometers.
Sleep time planner
Work backward from wake time to a suggested bedtime.
Pregnancy due date estimate
Educational LMP-based dating — not a replacement for prenatal care.
Cycle estimator
Approximate next period timing — awareness aid, not contraception.
How to use these tools
Each calculator includes educational content below the widget: what the result means, how it is calculated, limitations, sources, and links to related Gilead articles. Soft estimates only — not diagnosis, treatment, or medication dosing.
Learn without calculating a dose
Want to understand how clinicians think about weight-based dosing? Read the education page — it does not compute a personal medication dose.
Open education articleOfficial references