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

Prime Factorization Calculator

Factor any positive integer into its prime components and list every divisor and the count of distinct prime factors.

basic
7,743 4.2 1 min
Everyday Life / Time & Date

Tree Age Calculator

Estimate a tree's age from its trunk circumference at chest height and a species-specific annual growth factor.

basic
12,740 4.8 1 min
Statistics / Descriptive

Percentile Rank Calculator

Compute the percentile rank of a chosen value within a list of numbers — the percentage of values that fall at or below...

basic
7,677 4.1 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.