Health Calculators & Utilities

Sleep timing, metabolic reference values, and fluid planning tools for U.S. readers, with formulas shown up front.

Circadian Sleep Window Estimator

Subtracts your sleep duration from your wake time, correctly crossing midnight, and shows a 15-minute window either side. Sleep needs and circadian timing vary; this is not a diagnosis.

Metabolic Biomarker Index

Calculates two defined reference values from fasting labs: HOMA-IR and the triglyceride/HDL ratio. Fill in one pair or both. Labs set their own reference ranges, so discuss results with a clinician.

Hydration Planner

A simple planning heuristic, not a prescription. Individual needs vary. If a clinician has told you to limit fluids, follow that advice.

Interpreting personal measurements responsibly

A single reading reflects one moment. Sleep, stress, illness, fasting status, medications, and lab methods all shift numbers. Look at trends with your clinician rather than reacting to one value, and never change medication because of an online estimate.

Which calculator fits your question?

Quick orientation only; none of these replace labs, sleep studies, or clinical judgment.

Comparison of Wellnessnaro tools
ToolYou enterYou getGood for
Sleep windowWake time, hours of sleepEstimated bedtime rangePlanning a consistent schedule
Metabolic indexFasting glucose/insulin or lipidsHOMA-IR and/or TG/HDL ratioUnderstanding defined formulas before a visit
Hydration plannerWeight, activity, climateDaily fluid planning rangeRough planning when no fluid restriction applies

Runs on your device

Inputs stay in the browser for these calculators. Nothing is stored on a Wellnessnaro server when you use the forms above.

Pair tools with guides

Sleep and metabolic numbers make more sense alongside context on circadian timing, lipids, and hydration needs.

Browse guides