Convert between decimal (KB, MB, GB, TB) and binary (KiB, MiB, GiB, TiB) data-storage units.
For Catan and other 2d6 games, compute the probability that at least one of your favoured numbers will come up over K ro...
Compute constant acceleration from initial velocity, final velocity, and time.
Compute powers of any base, including negative and fractional exponents, with full decimal precision.
Computes the OLS regression slope b₁ = [nΣXY − ΣXΣY] / [nΣX² − (ΣX)²] and intercept b₀ = (ΣY − b₁ΣX) / n from five summa...
Estimate the entropy of a password in bits and the approximate time to brute-force it at a chosen guess rate.
Computes the number of significant decimal digits, smallest representable positive number, and largest finite number for...
Compute the arithmetic mean (average), along with the median, mode, sum, and range, of any comma-separated list of numbe...
Calculates Kendall's tau τ = (C − D) / (n(n−1)/2), where C is concordant pairs and D is discordant pairs. Robust alterna...
Compute the area under a ROC curve using the trapezoidal rule on 5 user-supplied (FPR, TPR) operating points (plus the i...
Estimate the loaded-salary cost of a meeting from the number of attendees, their average hourly rate, and the meeting le...
Linearly interpolate (or extrapolate) the value of y at a target x given two known points (x₁, y₁) and (x₂, y₂).
Every "X% of Y" problem, every "what percent of", every percent-change question — written out the way you'd actually say them.
Daniel Oh
Standard deviation is "average distance from the average". That one sentence covers 90% of everything you ever need to remember about it.
Daniel Oh