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

Distance Between Two Points (2D)

Compute the straight-line distance between two points (x₁, y₁) and (x₂, y₂) in the plane, plus the slope of the line thr...

basic
19,823 4.5 1 min
Other / Tech

Color Converter

Convert a color between hex, RGB, and HSL representations and read its relative luminance for accessibility.

basic
2,441 3.9 1 min
Math / Percentage

Matrix Inverse (2×2) Calculator

Compute the inverse of a 2×2 matrix [[a, b], [c, d]] = (1/det) × [[d, −b], [−c, a]], or flag the matrix as singular when...

basic
20,020 4.8 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.