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

Cohen's d Effect Size Calculator

Compute Cohen's d effect size = (M₁ − M₂) / SD_pooled, with rule-of-thumb interpretation (0.2 small, 0.5 medium, 0.8 lar...

basic
684 4.1 1 min
Math / Percentage

Geometric Mean Calculator

Compute the geometric mean of a list of positive numbers — useful for averaging growth rates and ratios.

basic
4,578 4.5 1 min
Math / Percentage

Newton's Method Step Calculator

Perform one Newton-Raphson iteration to refine an estimate of a root: x_{new} = x − f(x) / f'(x), given the current esti...

basic
24,566 4.1 1 min
Math / Geometry

Distance Between Two Points (2D)

Compute the straight-line distance between two points (x₁, y₁) and (x₂, y₂) in the plane, plus the slope of the line thr...

basic
22,062 4.5 1 min
Everyday Life / Time & Date

Age Calculator

Calculate your exact age in years, months, weeks, and days from a date of birth and a reference date.

Featured basic
8,143 4.7 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