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
Physics / Electricity

Battery Life Calculator

Estimate how long a battery will last from its capacity (mAh or Ah) and the load current draw, with a configurable real-...

basic
18,985 4.3 1 min
Other / Tech

Color Converter

Convert a color between hex, RGB, and HSL representations and read its relative luminance for accessibility.

basic
18,647 4.3 1 min
Math / Geometry

Cone Volume Calculator

Compute the volume, slant height, and lateral surface area of a right circular cone from its radius and height.

basic
373 4.9 1 min
Other

GPA Calculator

Compute a weighted grade-point average from a list of courses with credit hours and 4.0-scale grade points.

basic
21,197 4.0 1 min
Math / Percentage

Ratio Simplifier

Reduce a ratio a:b to its lowest terms by dividing both terms by their greatest common divisor, and report the equivalen...

basic
16,858 4.5 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