Medical

Check medication dose arithmetic from a label or prescription: mg/kg, concentration in mg/mL, mL per dose, doses per day, course volume and entered maximum-dose limits.

Compare historical pediatric dose-scaling rules from an adult single dose: Young's rule, Clark's rule, Fried's rule and body-surface-area scaling.

Estimate kidney function with CKD-EPI 2021 creatinine eGFR for adults, bedside Schwartz for children, MDRD comparison and Cockcroft-Gault creatinine clearance.

Estimate blood alcohol concentration from drinks, body weight, biological sex and time using a Widmark-style model. For safety education only, never for deciding whether to drive.

Classify a blood pressure reading using AHA/ACC adult categories and calculate MAP, pulse pressure and rate-pressure product for a home blood pressure log.

Estimate maximum heart rate from age with common formulas and compare target heart-rate zones for exercise intensity planning.

Конвертер диоптрии ↔ фокусное расстояние, сложение тонких линз и ориентировочный пересчёт очков в контактные линзы по вершинной формуле. Наглядная демонстрация размытия при остаточной рефракции.

Estimate binocular PD, monocular PD and near PD for glasses ordering from manual measurements or a card-calibrated photo method.

Estimate total blood volume with Nadler, Lemmens and mL/kg methods, plus plasma and red-cell volume from hematocrit.

Calculate 1-minute, 5-minute and optional 10-minute Apgar scores from Appearance, Pulse, Grimace, Activity and Respiration components.

Calculate the adult Glasgow Coma Scale total from eye opening, verbal response and motor response components, with cautions for non-testable components.

Estimate creatinine clearance with the Cockcroft-Gault equation and compare the absolute CrCl result with a BSA-normalized value.

Estimate calculated serum osmolality, effective tonicity and optional osmolal gap from sodium, glucose, BUN, ethanol and measured osmolality.

Calculate serum anion gap with optional potassium, albumin correction and delta ratio for cautious acid-base interpretation.

Calculate an estimated target heart rate range from age, resting heart rate, intensity and max-heart-rate method, with Karvonen and percent-max options.

Run a screen-based Snellen-style visual acuity screening check for each eye, with distance and screen-size calibration caveats.