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

Health

Pneumonia Severity Index (PSI/PORT) Score Calculator

Calculates the PSI/PORT score for community-acquired pneumonia from demographic, comorbidity, physical exam, and lab fin...

basic

16,478 4.3 1 min

Physics / Mechanics

Velocity Calculator

Compute velocity from displacement and time, or solve for either one given the other two.

basic

9,161 4.8 1 min

Math

Cardano's One Real Root of a Depressed Cubic Calculator

Find one real root of a depressed cubic t³ + p·t + q = 0 using Cardano's formula in the discriminant-positive case (Δ =...

basic

12,931 4.6 1 min

Physics

Wave Speed from Frequency and Wavelength Calculator

Calculates wave speed v = f·λ, and solves for any missing variable. Includes period T = 1/f and wavenumber k = 2π/λ.

basic

21,871 4.8 1 min

Sports / Running

Calories Burned Running from Speed, Weight, and Time Calculator

Calculates calories burned running using MET-based formula. MET ≈ 0.1 × speed(m/min) + 3.5 (ACSM walking/running equatio...

basic

22,592 5.0 1 min

Statistics / Descriptive

Mean, Median, Mode Calculator

Paste a list of numbers to get mean, median, mode, range, and standard deviation instantly.

basic

1,108 4.0 1 min

Everyday Life

Food Shelf Life & Storage Temperature Calculator

Estimates food shelf life at a given storage temperature relative to a reference temperature using the Q10 temperature c...

basic

4,837 3.8 1 min

Math / Percentage

Significant Figures Calculator

Count the significant figures in a number and round it to a chosen number of significant figures with optional scientifi...

basic

1,613 4.4 1 min

Math / Geometry

Great-Circle (Haversine) Distance Calculator

Compute the great-circle distance between two latitude/longitude points on Earth using the Haversine formula (mean Earth...

basic

23,222 4.1 1 min

Statistics

F-Test Variance Ratio Calculator

Compute the F-statistic for comparing two sample variances (the larger over the smaller) and report the numerator and de...

basic

8,869 5.0 1 min

Math / Percentage

Factorial Calculator

Compute the factorial n! = 1 · 2 · 3 · ... · n for any non-negative integer up to 170 (the largest n that fits in a doub...

basic

8,802 4.3 1 min

Physics / Electricity

Series / Parallel Resistance Calculator

Compute the equivalent resistance of any number of resistors wired in series or in parallel from a comma-separated list...

basic

4,781 4.5 1 min

Showing 433 to 444 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

Pneumonia Severity Index (PSI/PORT) Score Calculator

Velocity Calculator

Cardano's One Real Root of a Depressed Cubic Calculator

Wave Speed from Frequency and Wavelength Calculator

Calories Burned Running from Speed, Weight, and Time Calculator

Mean, Median, Mode Calculator

Food Shelf Life & Storage Temperature Calculator

Significant Figures Calculator

Great-Circle (Haversine) Distance Calculator

F-Test Variance Ratio Calculator

Factorial Calculator

Series / Parallel Resistance Calculator

Percentages Without the Headache

Standard Deviation in Five Minutes