Clinical references, not clinical decision-support

The Toolenza tools that physicians find useful are the quick-reference calculators — BSA for chemo dosing, due date from LMP, heart-rate zones for stress-test interpretation, BMI for documentation. These are not replacements for hospital information system calculators or formal clinical decision-support; they're the napkin math that should agree with the formal system before you trust either.

Every clinical-calc page carries an explicit disclaimer: Educational reference only — not medical advice. Always confirm with a licensed clinician and your institution's protocol for any patient care decision. The pages are educational; the dosing decision is yours.

What physicians reach for

Body-size and surface-area

• bsa — Body Surface Area in m² via Mosteller (1987, modern default), DuBois (1916, historical), and Haycock (1978, pediatric). All three computed simultaneously so you can cross-check across formulas — especially useful in obese patients where DuBois under-predicts.
• bmi-calculator — Body Mass Index in metric and imperial with WHO category bands.
• body-fat — US Navy circumference method.

Energy and macros (for nutrition counselling)

• bmr — Basal Metabolic Rate via Mifflin-St Jeor.
• tdee — Total Daily Energy Expenditure (BMR × activity factor).
• macro — protein/carb/fat splits for cut/maintain/bulk goals.
• calories + protein-intake + water-intake — hydration and nutrition targets per body weight.

Cardiology and pregnancy

• heart-rate-zones — Max-HR and Karvonen reserve methods for the five training zones; clinically useful for stress-test interpretation and exercise prescription.
• bpm — tap-out a pulse for a quick BPM read.
• pregnancy + due-date — gestational age, trimester, milestones, EDD via Naegele's rule from LMP or conception date.

Day around the clinic

• sleep — 90-minute sleep cycle calculator. Useful at the front of a call shift.
• pomodoro + multi-stopwatch + timer — focus and multi-task timing (charting blocks, procedure observations).
• days-between + countdown — follow-up window calculations, board-exam countdowns.
• world-clock + time-zone — for telemedicine across zones.

What's deliberately not here yet

The Toolenza catalog is intentionally not a comprehensive clinical-calc bundle today. The roadmap includes eGFR, MELD, Child-Pugh, CHA₂DS₂-VASc, NIHSS, Wells, Apgar, GCS, pediatric mg/kg dosing, IV drip rate, and fluid resuscitation — each with the same educational-disclaimer pattern. If you want any specific calculator prioritised, get in touch.

Privacy and data

Nothing you type into a clinical calculator ever leaves your browser. The calculators are pure-client JavaScript. Toolenza is not HIPAA-eligible and must not be used for patient-identifying data — but the calculators don't ask for identifying data either. They're depersonalised numerical tools.