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Practical tools

Useful calculations and planning aids — with assumptions shown.

A health tool should explain what it can estimate, what it cannot determine, and when professional interpretation matters. These interactive examples run only in your browser.

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Quick calculators

Explore a number—with its limitations visible.

Open only the calculator you need. Each result explains the assumptions that shape the estimate.

General screeningBMI calculatorEstimate body mass index from height and weight.
Enter height and weight to see an educational estimate.
BMI does not directly measure body composition or overall health. This is not a diagnosis, and interpretation may differ across age, pregnancy, athletic build, body composition, and clinical context.
Sleep planningSleep debt calculatorCompare recent sleep with your chosen nightly target.
Use a period that reflects a reasonably consistent recent pattern.
Enter your target, average sleep, and number of nights.
This is not a clinical sleep assessment or a literal hour-for-hour recovery prescription. See the CDC/NIOSH explanation of sleep debt.
Timing estimateCaffeine half-life calculatorEstimate how much caffeine may remain over time.
Enter an amount and consumption time to see an estimated timeline.
This is not a personalized prediction of when stimulation will wear off. Metabolism varies with pregnancy, medicines, smoking, liver health, genetics, and other factors. Review the FDA source.
Routine timingFasting timerTrack elapsed time toward a fasting goal on this device.
00:00:00
0% of 16-hour goal16 hr remaining
Choose a goal and start when your fast begins.
Calculate a completed fast Date & time
Enter the start and end date and time.
This timer is an organizational aid, not a recommendation to fast. Fasting may be unsafe with pregnancy, a history of an eating disorder, diabetes, certain medicines, or some medical conditions. Ask a qualified healthcare professional what is appropriate for you, and stop if you feel unwell.
Focus and recoveryPomodoro timerAlternate focused work with short, intentional breaks.
25:00
Focus interval0 of 4 focus sessions
Start a 25-minute focus interval. Your progress stays on this device.
The classic rhythm is 25 minutes of focus followed by a 5-minute break, with a longer break after four focus sessions. Pause or change intervals whenever you need to.
Medication organization

Keep the instructions you already have in one place.

Create a local schedule that can flow directly into your visit plan.

Stored in this browserMedication scheduleOrganize medicine names, doses, timing, instructions, notes, and refill dates.
Leave blank if there is no fixed time.
Entries are stored only in this browser. Copy instructions exactly from the prescription label, and confirm uncertainties with a pharmacist or prescriber.
Visit preparation

Prepare once. Leave with a brief and better questions.

Enter your context one time. The tool creates a one-page visit brief plus a prioritized question list.

1 Concise visit brief2 Five focused questions3 Copy or print together
Nothing is automatically saved or sentPrepare for a healthcare visitBest for organizing what matters, sharing useful context, and deciding what to ask first.
Open daily tracker
Uses the same device or signed-in account data shown on the tracker page. Nothing is sent with this plan.
Add health background Optional
The first three are marked as priorities.
Review the generated plan for accuracy before sharing it. It is not a medical record, diagnosis, treatment recommendation, or substitute for a healthcare professional’s medication list. Adapt the questions to your situation and seek urgent care for emergencies. Inspired by AHRQ and NIA visit-preparation guidance.
Advanced clinical tools

Use with a clinician or pharmacist.

These calculations depend on clinical inputs and should not be used independently to make medication decisions.

Professional interpretation needed
Advanced · medication-related estimateCreatinine clearanceEstimate Cockcroft–Gault creatinine clearance for educational discussion—not dosing.
Do not use this result to start, stop, or dose a medicine. Weight selection, kidney stability, laboratory method, body composition, and drug-specific guidance can materially change interpretation.
The original formula applied 0.85 to females. Current clinical use requires patient-specific interpretation.
Enter clinician-reviewed inputs to see an educational estimate.
A helpful next step

A useful number should lead to a useful question.

Use Otto to understand a tool’s assumptions, then decide whether the result belongs in a conversation with a pharmacist or other healthcare professional.

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