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

Weighted Average Calculator

Compute a weighted average from two equal-length lists of values and weights — useful for grades, weighted survey scores...

basic
1,453 4.1 1 min
Chemistry / Solutions

Normality Calculator

Compute the normality (N) of a solution from its molarity (M) and the number of equivalents per mole.

basic
19,605 3.9 1 min
Math / Geometry

Sector Area Calculator

Compute the area of a circular sector ("pie slice") from the radius and the central angle in degrees.

basic
10,963 4.6 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.