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
Everyday Life / Tips

Party Cost Calculator

Estimate the total cost and per-guest cost of a party, given fixed costs (venue, decor) and per-guest costs (food, drink...

basic
22,807 4.9 1 min
Food / Drinks

Beer ABV Calculator

Estimate the alcohol-by-volume (ABV) of a homebrew from the original and final specific gravity readings using the stand...

basic
13,579 4.2 1 min
Math / Geometry

Annulus (Ring) Area Calculator

Compute the area of an annulus (the region between two concentric circles) from the outer and inner radii: A = π · (R² −...

basic
3,607 4.9 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
2,266 4.8 1 min
Other / Tech

Image File Size Calculator

Compute the uncompressed file size of a raster image from its pixel dimensions and bit depth (channels × bits per channe...

basic
2,382 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.