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
Statistics / Probability

Bayes' Theorem Calculator

Compute the posterior probability P(A|B) from the prior P(A), the likelihood P(B|A), and the false-positive rate P(B|¬A)...

basic
23,498 3.9 1 min
Other / Tech

Roman Numeral Converter

Convert between Arabic numbers (1–3,999) and Roman numerals — the calculator detects the direction automatically.

basic
1,403 4.9 1 min
Other

Unix Timestamp Converter

Convert in either direction between Unix timestamps (seconds since 1970-01-01 UTC) and human-readable UTC date/time stri...

basic
10,777 4.6 1 min
Math / Percentage

Harmonic Mean Calculator

Compute the harmonic mean of a list of positive numbers — useful for averaging rates such as speeds or ratios.

basic
6,171 4.8 1 min
Chemistry / Solutions

Gas Density Calculator

Compute the density of an ideal gas at given pressure and temperature from its molar mass, using ρ = PM/(RT).

basic
13,813 3.8 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