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
Chemistry / Solutions

Charles's Law Calculator

Find the missing volume or temperature in Charles's law (V₁/T₁ = V₂/T₂) for an ideal gas at constant pressure.

basic
18,768 4.1 1 min
Physics / Electricity

Electric Power Calculator

Compute electric power from any two of voltage, current, or resistance using P = VI, P = I²R, and P = V²/R.

basic
20,995 3.9 1 min
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
11,158 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.