Free health tools

Free health tools.

A focused page for each calculator and worksheet: scores, cholesterol ratios, sleep, macros, medications and visit prep. Every one is free, keeps its sources on the page, and stores nothing you type.

Browse tools Free resources

Free, no accountSources on the pageNothing is stored

ExampleCalorie tool

2,155kcal to maintain

At rest1,390 kcal

Goal target2,155 kcal

How to use the hub

Start with one question, then keepthe source beside the answer.

The tools are not a separate product maze. They are small public surfaces for the moments people actually bring to Ojava: a lab result, a food log, a sleep score, a medication list, or a visit-prep question.

The rhythm

Pick one focused tool for the record in front of you.
Keep the source, missing context, and boundary visible.
Bring the result into Ojava Coach when your own records should shape the next question.

Calculators, explainers and worksheets, each on its own focused page.

Distinct papers, guidelines and official education sources linked from the set.

To use any of them. No account, no card, and nothing you enter is stored.

Free health tools

Choose the tool by the moment you are in.

Calculators, explainers, and worksheets stay on focused pages. The hub simply helps you pick the right starting point without turning the page into a catalog.

Numbers to orient

When the question starts with a score, ratio, or trend

Use a focused calculator first, then keep the inputs and citations beside the result before you decide what to ask next.

Research-backed Health Score calculatorCalculate an education-only health score from Life's Essential 8 inputs, then carry the cited result into Ojava Coach.Cholesterol ratio calculatorEnter total cholesterol, HDL-C, LDL-C, and triglycerides to compute conversation ratios and prepare clinician questions.Longevity readiness assessmentCheck whether labs, sleep, activity, nutrition, medications, family history, and goals are ready for a longevity review.Sleep score interpreterInterpret a 0 to 100 wearable sleep score with sleep hours, debt, awakenings, and wellness-only next questions.

Records to clean up

When the next step is organizing what you already have

Check whether labs, source labels, visit notes, and record folders are clear enough to support a useful review.

Biomarker reference guideSearch or browse supported lab markers, then turn a single explanation into a record-aware Ojava Coach question after login.Health-data starter calculatorScore whether your records, labs, wearables, food logs, symptoms, goals, and source labels are ready for a useful review.Lab-test prep checklistPrepare fasting, supplement, medication, exercise, sleep, and timing notes for a lab discussion.Medical records visit-prep checklistCheck whether the records you want to discuss are gathered before the visit.

Conversation prep

When you need cleaner questions before a real appointment

Turn a medication list, food diary, or symptom pattern into a grounded prompt for a licensed clinician conversation.

Medication interaction conversation prepList medications and supplements to prepare source-backed questions for a clinician or pharmacist conversation.Food-log quality checkerCheck whether a food diary has reviewed days, portions, source labels, calorie-to-macro consistency, and questions for a useful conversation.Chronic symptom and flare worksheetOrganize symptoms, flare timing, possible triggers, recovery notes, and questions before a clinician conversation.

Nutrition targets

When you want a calorie, macro, or protein number to start from

Estimate a daily calorie target, split it into protein, carb, and fat grams, or size a protein range from your body weight, the same targets Ojava Coach references.

Daily calorie calculatorEstimate resting rate, maintenance calories, and a goal-adjusted daily target from your sex, age, height, weight, and activity level.Macro calculatorSplit a daily calorie target into protein, carb, and fat gram goals using the same targets Ojava Coach references.Daily protein target calculatorEstimate a daily protein range in grams from your body weight and activity level, with the published ranges behind it.

Research basis

Every result here traces backto a source you can open.

A calculator that will not show its working is an opinion with a nice typeface. Each tool links the paper, guideline or official education page its math, framework and boundary came from, and the whole library sits one click away rather than down the length of this page.

Source library31 references behind 14 tools.Papers, clinical guidelines, and official education pages, listed under the tool that uses each one.Open the list

Research basis

Source library

Each free Ojava calculator and worksheet links to the source used for its educational math, framework, or medical boundary.

2026 ACC/AHA/Multisociety Guideline on the Management of DyslipidemiaBlumenthal, Morris, Gaudino, et al., 2026. Current guideline support for lipid context and non-HDL cholesterol. The public tool only computes arithmetic ratios and non-HDL cholesterol from user-entered values.
ATP III Guidelines At-A-Glance Quick Desk ReferenceNational Heart, Lung, and Blood Institute, 2002. Defines non-HDL cholesterol as total cholesterol minus HDL cholesterol. Treatment targets in this older reference are not used as current advice.
Major Lipids, Apolipoproteins, and Risk of Vascular DiseaseEmerging Risk Factors Collaboration, 2009. Landmark prospective evidence for lipid and apolipoprotein context. It does not validate Ojava as a personal risk calculator.
How to Understand Your Lab ResultsMedlinePlus, U.S. National Library of Medicine, 2025. Supports reference-range education and the need to interpret lab results with personal context and a clinician. It does not support personal diagnosis or treatment targets.
Laboratory TestsMedlinePlus, U.S. National Library of Medicine, 2025. Supports lab-prep reminders that food, medicines, instructions, and timing can affect results. It does not support ordering tests or changing medicines.
Drug Interactions: What You Should KnowU.S. Food and Drug Administration, 2013. Supports consumer education around drug-drug, drug-food, supplement, and condition interactions. It does not make Ojava a comprehensive interaction checker.
DailyMed Drug LabelingU.S. National Library of Medicine, 2026. Supports official label-backed medication education. Label mentions are not the same as patient-specific safety clearance.
Mixing Medications and Dietary Supplements Can Endanger Your HealthU.S. Food and Drug Administration, 2022. Supports asking a clinician or pharmacist about supplement and medication combinations instead of treating a missing match as safe.
American Geriatrics Society 2023 updated AGS Beers Criteria for potentially inappropriate medication use in older adultsAmerican Geriatrics Society Beers Criteria Update Expert Panel, 2023. Supports medication-review caution and the idea that certain medication risks depend on age, condition, kidney function, and drug-drug context. It is not a patient-specific safety clearance.
Recommended Amount of Sleep for a Healthy AdultAmerican Academy of Sleep Medicine and Sleep Research Society, 2015. Supports adult sleep-duration education. The tool does not diagnose sleep disorders or validate a specific wearable score.
Sleep Health: Can We Define It? Does It Matter?Buysse, 2014. Supports sleep health as a multidimensional pattern, including duration, timing, efficiency, satisfaction, and alertness. It does not validate Ojava score bands.
Irregular Sleep/Wake Patterns Are Associated With Poorer Academic Performance and Delayed Circadian and Sleep/Wake TimingPhillips, Clerx, O'Brien, et al., 2017. Supports sleep regularity and timing as meaningful wellness context. It does not validate a proprietary wearable score.
Life's Essential 8: Updating and Enhancing the American Heart Association's Construct of Cardiovascular HealthLloyd-Jones, Allen, Anderson, et al., 2022. Defines the 0 to 100 Life Essential 8 cardiovascular health construct that Ojava uses for the public score. It does not diagnose disease, predict personal events, or define treatment.
Physical Activity Guidelines for Americans, 2nd editionU.S. Department of Health and Human Services, 2018. Supports the adult activity-minute component used inside Life Essential 8 scoring. It does not make the public score a personalized exercise prescription.
Dietary Assessment PrimerNational Cancer Institute, 2026. Supports the boundary that self-reported dietary data need clear methods, detail, and careful interpretation. It does not validate Ojava as a diet-quality, diagnosis, or treatment tool.
24-hour dietary recall at a glanceNational Cancer Institute, 2026. Supports capturing foods, beverages, time, source, preparation details, and portion size instead of relying on a food name alone. It does not make Ojava a clinical dietary assessment.
Overview of Dietary Assessment Methods for Measuring Intakes of Foods, Beverages, and Dietary Supplements in Research StudiesCurrent Nutrition Reports, 2021. Supports the evidence boundary that self-reported dietary exposure measurement is difficult and should be interpreted as pattern context. It does not support calorie prescriptions or medical nutrition therapy.
A New Aging Measure Captures Morbidity and Mortality Risk Across Diverse Subpopulations From NHANES IVLiu, Kuo, Horvath, Crimmins, Ferrucci, and Levine, 2018. Supports clinical-chemistry Phenotypic Age equation and cohort validation context. Ojava calculates only when the nine required markers and chronological age are available.
An Epigenetic Biomarker of Aging for Lifespan and HealthspanLevine, Lu, Quach, et al., 2018. Supports the scientific lineage of PhenoAge and DNAm PhenoAge. Ojava distinguishes readiness from methylation-clock testing.
Biological aging and generational shifts in early-onset cancer riskCao, Zhang, Wang, et al., 2026. Supports association-level education that PhenoAge-defined age gap was linked with early-onset solid cancer risk in large cohorts. Ojava does not calculate cancer risk, screening eligibility, diagnosis, or prevention treatment.
Patient Generated Health Data Use in Clinical PracticeCohen, Keller, Hayes, et al., 2019. Supports auditing whether patient-generated data have provenance and clinical-use context before treating them as useful care context. It does not validate Ojava as a diagnostic system.
Personal Health Records: A Scoping ReviewArcher, Fevrier-Thomas, Lokker, et al., 2011. Supports personal health records as patient-centered systems for making medical records and related information accessible. It does not define completeness for a specific person.
Reliability and Validity of Commercially Available Wearable Devices for Measuring Steps, Energy Expenditure, and Heart RateFuller, Colwell, Low, et al., 2020. Supports treating consumer wearable data as useful trend context with device and metric limitations. It does not validate wearable data as a standalone medical finding.
A new predictive equation for resting energy expenditure in healthy individualsMifflin, St Jeor, Hill, et al., 1990. Supports the Mifflin-St Jeor resting energy expenditure equation used for the public calorie estimate. It does not diagnose a metabolic condition or replace individualized dietitian guidance.
Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino AcidsInstitute of Medicine (US) Panel on Macronutrients, 2005. Supports the Acceptable Macronutrient Distribution Range used to frame the public protein, carbohydrate, and fat split. It does not prescribe an individualized diet or treat a medical condition.
International Society of Sports Nutrition Position Stand: protein and exerciseJager, Kerksick, Campbell, et al., 2017. Supports the 20 to 40g per-serving educational range for healthy exercising people. It does not prescribe protein grams, diagnose deficiency, or replace clinician or dietitian guidance.
Ingested protein dose response of muscle and albumin protein synthesis after resistance exercise in young menMoore, Robinson, Fry, et al., 2009. Supports the 20g meal-entry anchor as an educational muscle-protein-synthesis reference. It does not make Ojava a diet prescription, sports-nutrition plan, or medical nutrition therapy.
Dietary Protein Distribution Positively Influences 24-h Muscle Protein Synthesis in Healthy AdultsMamerow, Mettler, English, et al., 2014. Supports reviewing protein distribution across meals as general wellness context. It does not validate Ojava as a personalized protein target or treatment tool.
The Patient-Reported Outcomes Measurement Information System developed and tested its first wave of adult self-reported health outcome item banksCella, Riley, Stone, et al., 2010. Supports structured patient-reported symptom collection. Ojava does not use PROMIS scoring or claim PROMIS validation.
Improving Diagnosis in Health CareNational Academies of Sciences, Engineering, and Medicine, 2015. Supports structured symptom and record organization as part of a collaborative diagnostic process with clinicians.
QuestionBuilder AppAgency for Healthcare Research and Quality, 2026. Supports preparing questions before appointments and saving those questions for the visit. It is not a substitute for clinician review or emergency care.

After the quick answer

The tool is the start, not the whole story

Use a calculator or worksheet to orient yourself, then bring reviewed records into Ojava when the question needs more context.

Add your records How public resources work

What every tool holds toThree rules

Sources stay visible

Every public tool keeps its citation lane nearby so a score, worksheet, or checklist is not detached from the reference behind it.

Missing context stays named

The hub points you toward the record, note, or source detail that would make the result easier to review later.

Education stays bounded

These tools prepare questions and context. They do not diagnose, prescribe, order labs, or replace licensed care.