Daniel Oh
Featured contributor MSc Applied Statistics; 7 years in analytics and data tooling.

Daniel Oh

Senior Contributor, Math & Statistics

0 calculators 0 articles Member since Jun 2026
Statistics / Descriptive

Quartile Calculator

Compute the five-number summary (min, Q1, median, Q3, max), interquartile range, and 1.5×IQR outliers from a list of num...

basic
1,681 4.2 1 min
Math / Percentage

Ratio Calculator

Solve for a missing term in a proportion, simplify ratios, or scale one ratio up or down.

basic
2,928 4.1 1 min
Math / Geometry

Ellipse Perimeter Calculator

Compute the perimeter of an ellipse from its semi-major (a) and semi-minor (b) axes using Ramanujan's second approximati...

basic
18,175 4.8 1 min
Other / Randomness

Random Number Generator

Generate one or more random integers in a chosen range, with optional uniqueness and optional sorting.

basic
20,662 5.0 1 min
Conversions / Length

Volume Converter

Convert between litres, millilitres, gallons, quarts, pints, cups, and more — with both US and imperial units.

basic
21,459 3.9 1 min
tutorial Math

Percentages Without the Headache

Every "X% of Y" problem, every "what percent of", every percent-change question — written out the way you'd actually say them.

Daniel Oh Daniel Oh
3 min