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 / Percentage

Covariance Calculator

Compute the sample covariance, population covariance, Pearson correlation r, and the slope of the regression line from t...

basic
18,809 4.7 1 min
Math / Geometry

Triangle Calculator

Solve a triangle from any valid combination of sides and angles — SSS, SAS, ASA, AAS, or SSA.

Featured basic
25,290 4.4 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.