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

Exponential Decay Calculator

Compute the remaining quantity after time t for an exponentially decaying process N(t) = N₀ · e⁻ᵏᵗ, plus the half-life.

basic
2,093 4.5 1 min
Math / Geometry

Pythagorean Theorem Calculator

Find the hypotenuse from two legs, or recover a missing leg from the hypotenuse and the other leg, using the Pythagorean...

Featured basic
7,325 4.0 1 min
Physics / Mechanics

Doppler Effect Calculator

Compute the frequency observed by a stationary observer when a source moves at velocity v_s, using the classical Doppler...

basic
4,266 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