Health

Prioritized correction plan for simultaneous Na/K/Mg disorders. Priority: Mg → K → Na. Hypomagnesemia causes refractory K wasting; hyperkalemia is an emergency. Severe hyperkalemia, ODS risk, and interaction warnings included. Derived from Adrogué 2000, Gennari 1998, Agus 1999, Huang 2007, and Whang 1994. Not medical advice.

Health

Calculate the hourly maintenance fluid rate using the Holliday-Segar 4-2-1 rule: first 10 kg at 4 mL/kg/h, next 10 kg at 2 mL/kg/h, each kg above 20 at 1 mL/kg/h. Also shows the 24-hour total and the 100/50/20 mL/kg/day daily method for cross-checking. Weight in kg or lb (auto-converted). Derived from Holliday-Segar Pediatrics 1957, MDCalc, and Meyers 2009. Not medical advice.

Health

Calculate the 24-hour crystalloid for moderate-to-severe burns using Parkland (4 mL/kg/%TBSA LR) or Brooke (2 mL/kg/%TBSA LR), accounting for elapsed time since burn. Titrate to urine output. Derived from Baxter 1974, ABA 2008, MDCalc, and ISBI 2016. Not medical advice.

Science & Education

Log Brix / specific-gravity readings over time, plot the decay curve, compute apparent attenuation & projected ABV, and predict the fermentation end-point

Health

Estimate total body iron stores from serum ferritin. Size-independent rule: stored iron (mg) ≈ ferritin (µg/L) × 10. Body-weight estimate (better across body habitus): stored iron (mg) ≈ ferritin × weight(kg) × 0.0024 (Walters 1973). Adult ferritin reference: men ~30–300 µg/L, women ~15–150 µg/L. Ferritin < 30 µg/L (men) or < 15 µg/L (women) strongly indicates iron deficiency; < 100 µg/L in an inflammatory state does not exclude it. Ferritin > 300 µg/L (men) / > 200 µg/L (women) with TSAT > 45–50% suggests iron overload (hereditary hemochromatosis, dysmetabolic iron overload, iron-loading anemias, transfusions, chronic liver disease); > 1000 µg/L warrants evaluation of hemochromatosis, iron-loading anemias, or hyperferritinemic syndromes. Ferritin is an acute-phase reactant — interpret with TSAT and CRP. Derived from Camaschella 2019, Adams NEJM 2005, and WHO 2020. Not medical advice.

Design

Preview a heading and body font pairing with real copy, sizes, weights, line heights, character samples, and CSS stacks.

Math & Numbers

Convert mass flow rate between kg/s (kilograms per second, SI base), lb/h (pounds per hour, 1 lb = 0.45359237 kg), and t/h (tonnes per hour, 1 t = 1000 kg). Converts via kg/s to the target unit and also lists the equivalent value in all three units for reference. Used for boiler feedwater, chemical dosing, fuel consumption, and compressed-gas metering.

Math & Numbers

Convert volumetric flow rate between m³/h (cubic metres per hour), L/min (litres per minute), gpm (US gallons per minute, 1 gal = 3.785411784 L), and cfm (cubic feet per minute, 1 ft³ = 28.3168466 L). Converts via m³/s to the target unit and also lists the equivalent value in all four units for reference. Used for pumps, HVAC, compressed air, and piping.

Utilities

Identify a file by its magic-number byte signature, not the extension. Reads the uploaded file directly across ~70 types.

Data Visualization

Describe nodes and connections in Mermaid-style syntax and generate a layered flowchart diagram

Media

Convert FLAC audio files to ALAC (Apple Lossless) in an M4A container while preserving lossless quality and metadata when available

Math & Numbers

Calculate F distribution density, cumulative probability, and right-tail probability from numerator and denominator degrees of freedom