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

Biology / Genetics

Punnett Square Calculator

Build a Punnett square for a single-gene cross and get the expected genotype and phenotype ratios.

basic

9,332 4.9 1 min

Statistics / Probability

Geometric Distribution PMF Calculator

Compute P(X = k), the probability that the first success in a Bernoulli sequence occurs on trial k, using the shifted ge...

basic

3,118 5.0 1 min

Physics / Electricity

RC Time Constant Calculator

Compute the time constant τ = RC of an RC circuit, plus the practical "5τ" full-charge time.

basic

21,841 4.3 1 min

Math / Percentage

Depressed Cubic (Cardano's Method) Real Root Calculator

Finds the real cube root of the depressed cubic x³ + px + q = 0 using Cardano's formula: x = ∛(−q/2 + √D) + ∛(−q/2 − √D)...

basic

3,408 3.9 1 min

Math

Complex Number Multiplication Calculator

Multiply two complex numbers in rectangular form, returning the real and imaginary parts of the product, plus its modulu...

basic

2,909 3.8 1 min

Finance

WACC Blended Cost of Capital Calculator

Calculates the Weighted Average Cost of Capital (WACC) from equity and debt weights, cost of equity, pre-tax cost of deb...

basic

8,188 4.2 1 min

Physics

Capacitor Energy Stored Calculator

Calculates energy stored in a capacitor from capacitance and voltage, along with charge stored Q = CV.

basic

2,438 4.4 1 min

Physics

Flow Turbulence Intensity from Reynolds Number Calculator

Calculates the Reynolds number Re = ρvD/μ, classifies the flow regime (laminar Re < 2300, transitional 2300–4000, turbul...

basic

21,650 4.9 1 min

Everyday Life

Washing Machine Water & Energy Consumption Calculator

Calculates annual water consumption and electricity cost of a washing machine from loads per week, water usage per load,...

basic

20,697 4.9 1 min

Math

Continued Fraction Convergent Approximation Calculator

Evaluates a simple continued fraction [a₀; a₁, a₂, a₃] and reports the convergent value as a decimal approximation.

basic

615 3.8 1 min

Math

Continued Fraction First Convergents Calculator

Computes the first two convergents of a continued fraction from three partial quotients. Convergents are the best ration...

basic

9,693 4.3 1 min

Math

Mean of Grouped Frequency Data Calculator

Compute the mean of grouped data from up to six (midpoint, frequency) pairs: x̄ = Σ(fᵢ · xᵢ) / Σfᵢ.

basic

5,592 4.6 1 min

Showing 397 to 408 of 566 results

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

Mar 20, 2026 3 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

Jan 7, 2026 3 min

Reviewed by Daniel Oh

These calculators were technically reviewed by Daniel Oh for accuracy.

Health

Young's Rule Pediatric Dose Calculator

Calculate an age-based pediatric dose from a known adult dose using Young’s Rule. A quick educational tool for students...

basic

22,628 5.0 1 min

Best Free Calculator

Browse categories

Daniel Oh

Punnett Square Calculator

Geometric Distribution PMF Calculator

RC Time Constant Calculator

Depressed Cubic (Cardano's Method) Real Root Calculator

Complex Number Multiplication Calculator

WACC Blended Cost of Capital Calculator

Capacitor Energy Stored Calculator

Flow Turbulence Intensity from Reynolds Number Calculator

Washing Machine Water & Energy Consumption Calculator

Continued Fraction Convergent Approximation Calculator

Continued Fraction First Convergents Calculator

Mean of Grouped Frequency Data Calculator

Standard Deviation in Five Minutes

Percentages Without the Headache

Reviewed by Daniel Oh

Young's Rule Pediatric Dose Calculator