Math & Numbers

Calculate the arithmetic mean of a numeric dataset and review the main supporting statistics

Math & Numbers

Find the median of a dataset, inspect the sorted sequence, and optionally review quartiles and interquartile range

Math & Numbers

Find the most frequent value or values in a dataset and inspect the supporting frequency distribution

Math & Numbers

Compute the inverse of a square matrix using Gauss-Jordan elimination and report when inversion is impossible

Math & Numbers

Multiply two matrices and return the product with dimension checks and optional step explanations

Generator

Detect visually confusing field names and prefix collisions in CSV, JSON, or schema inputs, then suggest clearer renames

Math & Numbers

Convert miles to kilometers with configurable decimal precision

Math & Numbers

Convert meters to feet with configurable decimal precision

Document Tools

Convert a Markdown slide deck (Remark/Marp style) into a PDF

Astronomy

Predict and display information about major annual meteor showers

Format Conversion

Convert a Markdown pipe table to CSV, JSON rows or an inferred JSON Schema with alignment and null diagnostics

Health

Calculate LDL-C (low-density lipoprotein cholesterol) indirectly with the Friedewald formula. In mg/dL: LDL-C = Total Cholesterol − HDL-C − (Triglycerides / 5); in mmol/L: LDL-C = TC − HDL-C − (TG / 2.2). Unreliable when triglycerides ≥ 400 mg/dL (4.5 mmol/L), in the non-fasting state, in type III dysbetalipoproteinemia, and at very low LDL-C (< 70 mg/dL). Treatment thresholds (ACC/AHA 2018): < 70 mg/dL (1.8 mmol/L) high-risk secondary prevention; < 100 mg/dL (2.6 mmol/L) moderate-risk / diabetes primary prevention; ≥ 190 mg/dL (4.9 mmol/L) suggests familial hypercholesterolemia. Unit system selectable: mg/dL or mmol/L. Derived from Friedewald 1972, Martin 2013, Sampson 2020, and ACC/AHA 2018. Not medical advice.