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

Math

Wilson Confidence Interval for a Proportion Calculator

Compute a Wilson score confidence interval for a single binomial proportion (95 % default). Outperforms the Wald interva...

basic

2,720 5.0 1 min

Everyday Life / Travel

Holiday Budget Calculator

Compute the per-day, per-person, and total daily-rate budget for a holiday from total budget, days, and travellers.

basic

16,612 4.9 1 min

Math / Geometry

Slope Calculator

Find the slope of the line through two points, plus the line equation in slope-intercept form.

basic

18,012 4.4 1 min

Sports

Volleyball Spike Jump Height & Reach Calculator

Calculates a volleyball player's spiking height and compares it to standard net height from standing reach and vertical...

basic

14,023 4.1 1 min

Math / Geometry

Distance Between Two 3D Points

Compute the Euclidean distance between two points in 3D space, given their (x, y, z) coordinates.

basic

21,633 4.1 1 min

Math / Geometry

Cylindrical to Cartesian Coordinates Calculator

Convert a 3-D point from cylindrical coordinates (r, θ, z) to Cartesian (x, y, z): x = r·cos θ, y = r·sin θ, z = z. Usef...

basic

4,932 4.5 1 min

Health

Glasgow Coma Scale (GCS) Calculator

Calculates the Glasgow Coma Scale total score from eye opening, verbal response, and motor response to assess the depth...

basic

17,450 4.0 1 min

Finance

Operating Expense Ratio (OER) Calculator

Calculates the Operating Expense Ratio OER = total operating expenses / net revenue × 100%. A lower OER indicates better...

basic

589 4.1 1 min

Math

Pooled Standard Deviation from Two Samples Calculator

Compute the pooled (combined) sample standard deviation of two independent samples that are assumed to share a common po...

basic

7,979 4.7 1 min

Math

Linear Regression Intercept from Sums Calculator

Compute the OLS intercept of a simple linear regression y = a + b·x once the slope b has been determined: a = (Σy − b·Σx...

basic

1,248 4.1 1 min

Other / Tech

Hash Generator

Compute MD5, SHA-1, SHA-256, SHA-512, and CRC-32 digests for any input string. Useful for verifying checksums against pu...

basic

3,838 4.0 1 min

Statistics / Descriptive

Coefficient of Variation Calculator

Calculate the coefficient of variation (CV) — a unitless measure of dispersion that lets you compare the spread of data...

basic

9,255 3.9 1 min

Showing 493 to 504 of 545 results

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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Browse categories

Daniel Oh

Wilson Confidence Interval for a Proportion Calculator

Holiday Budget Calculator

Slope Calculator

Volleyball Spike Jump Height & Reach Calculator

Distance Between Two 3D Points

Cylindrical to Cartesian Coordinates Calculator

Glasgow Coma Scale (GCS) Calculator

Operating Expense Ratio (OER) Calculator

Pooled Standard Deviation from Two Samples Calculator

Linear Regression Intercept from Sums Calculator

Hash Generator

Coefficient of Variation Calculator

Percentages Without the Headache

Standard Deviation in Five Minutes