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

Percentage Calculator

Solve every common percentage question — "what is X% of Y", "X is what percent of Y", and percentage change.

Featured Trending basic
15,479 4.5 1 min
Math / Percentage

Percent Difference Calculator

Compute the percent difference between two values — the absolute difference divided by their average, expressed as a per...

basic
3,828 4.2 1 min
Math / Geometry

Cylinder Volume Calculator

Volume, lateral surface area, and total surface area of a right circular cylinder from radius and height.

basic
1,799 4.9 1 min
Statistics / Probability

Z-score Calculator

Convert a raw value into a z-score using the mean and standard deviation of its distribution, and look up the correspond...

basic
6,437 4.9 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

Reviewed by Daniel Oh

These calculators were technically reviewed by Daniel Oh for accuracy.