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

About

Daniel writes and reviews the math and statistics calculators. His explainers lean on worked examples, clean formulas, and obvious edge cases so readers can copy the logic straight into a spreadsheet.

He previously worked as a data scientist at a consumer-tech startup before moving into full-time writing and tooling.

Areas of expertise

Statistics Probability Percentages Data analysis

Education & credentials

BSc Mathematics — University of Toronto
MSc Applied Statistics — ETH Zürich

Finance

Debt Service Coverage Ratio (DSCR) Calculator

Calculates DSCR from net operating income (NOI) and annual debt service (P&I) to assess whether a property or business c...

basic

16,790 4.3 1 min

Statistics / Probability

Poisson Distribution Probability Calculator

Calculates Poisson probabilities: P(X=k) = e^(−λ)·λᵏ/k!, and the cumulative P(X≤k) by summing from 0 to k. Used for coun...

basic

21,877 4.3 1 min

Health

Calorie Deficit for Weight Loss Rate Calculator

Calculates the expected weekly weight loss from a daily caloric deficit, based on the approximation that 7,700 kcal = 1...

basic

8,405 4.2 1 min

Physics / Mechanics

Column Euler Buckling Load Calculator

Calculates the Euler critical buckling load P_cr = π²EI/(KL)², where E is elastic modulus, I is second moment of area, K...

basic

22,365 3.9 1 min

Math / Geometry

Distance from Point to Plane Calculator

Compute the perpendicular distance from a 3-D point (x₀, y₀, z₀) to the plane a·x + b·y + c·z + d = 0, using d_pt = |a·x...

basic

5,216 4.0 1 min

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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

Jan 16, 2026 3 min

explainer Statistics

Standard Deviation in Five Minutes

Standard deviation is "average distance from the average". That one sentence covers 90% of everything you ever need to remember about it.

Daniel Oh

Dec 6, 2025 3 min

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Daniel Oh

Debt Service Coverage Ratio (DSCR) Calculator

Poisson Distribution Probability Calculator

Calorie Deficit for Weight Loss Rate Calculator

Column Euler Buckling Load Calculator

Distance from Point to Plane Calculator

Percentages Without the Headache

Standard Deviation in Five Minutes