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

One-Sample t-Test Calculator

Compute the t-statistic and degrees of freedom for a one-sample t-test from the sample mean, the population mean under H...

basic
15,050 4.9 1 min
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
12,944 4.2 1 min
Biology / Microbiology

DNA Concentration Calculator

Compute DNA concentration in ng/μL from a spectrophotometer absorbance reading at 260 nm and the cuvette dilution factor...

basic
15,067 3.8 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