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 / Mechanics

Velocity Calculator

Compute velocity from displacement and time, or solve for either one given the other two.

basic
19,986 4.1 1 min
Math / Percentage

Proportion Calculator

Solve a proportion a/b = c/d for any one of the four values, given the other three.

basic
23,843 4.8 1 min
Math

Tetrahedral Number Calculator

Compute the n-th tetrahedral number Te_n = n(n + 1)(n + 2) / 6 — the number of stacked spheres in a tetrahedron with n s...

basic
19,371 4.2 1 min
Other

Week of Year Calculator

Compute the ISO 8601 week-of-year, ISO week-numbering year, day-of-year, calendar quarter, and the date range of the con...

basic
21,448 4.2 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.