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
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
22,320 4.9 1 min
Physics / Mechanics

Thermal Expansion Calculator

Compute the linear thermal expansion of a solid from its original length, temperature change, and the material's linear...

basic
11,680 4.4 1 min
Other

Age in Days Calculator

Compute a person's (or anything's) precise age in days, weeks, whole months, whole years, and total hours from a date of...

basic
968 4.2 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

Reviewed by Daniel Oh

These calculators were technically reviewed by Daniel Oh for accuracy.