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
Other / Games

RPG XP Curve Calculator

Compute the XP needed to reach a target level on a quadratic XP curve, XP(n) = a · (n − 1)^p + b · (n − 1). Defaults rep...

basic
24,156 4.4 1 min
Math / Percentage

Significant Figures Calculator

Count the significant figures in a number and round it to a chosen number of significant figures with optional scientifi...

basic
12,380 4.5 1 min
Chemistry / Reactions

Atomic Mass Calculator

Compute the weighted-average atomic mass of an element with two stable isotopes from each isotope's mass and natural abu...

basic
4,063 3.9 1 min
Math / Geometry

Square Calculator

Get the area, perimeter, and diagonal of a square from its side length.

basic
12,637 4.1 1 min
Statistics

Odds Ratio Calculator

Compute the odds ratio from a 2×2 contingency table (exposed/non-exposed × outcome/no-outcome). OR > 1 means exposure is...

basic
1,876 4.2 1 min
Math / Percentage

Percent Error Calculator

Compute the percent error between an experimental measurement and the accepted theoretical value.

basic
22,979 4.3 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.