Sports
Predict marathon finish time based on recent race performance using running formulas
marathon-timeMath & Numbers
Convert liters to US cups with configurable decimal precision
liter-to-cupMath & Numbers
Convert liters to US liquid pints with configurable decimal precision
liter-to-pintMath & Numbers
Convert liters to US liquid quarts with configurable decimal precision
liter-to-quartMath & Numbers
Convert liters to US liquid gallons with configurable decimal precision
liter-to-gallonMedia
Detect a sample or loop key (Krumhansl-Schmuckler chroma) and transpose it to your project key — with the output key re-verified after shifting.
key-matcherGames
Deterministically seeded generator for eight Nikoli logic-puzzle families — each board is grown solution-first, rendered as puzzle + solution SVGs, and verified by an exhaustive backtracking solver that counts solutions to two, so “unique” is a proof (and an exhausted budget is reported as unproven, never guessed).
kakuro-fillomino-masyu-yajilin-hashiwokakero-nurikabe-slitherlink-and-star-battle-puzzle-generator-with-uniqueness-proverData Visualization
Parse q expressions and q-sql queries into an annotated tree showing right-to-left evaluation order, token classes, the functional select form and splayed-column attributes.
kdb-plus-q-sql-vector-expression-parse-tree-explainerScience & Education
Λ°m = ν₊λ°₊ + ν₋λ°₋ from the limiting ionic conductivity table, with ion shares as transport numbers.
kohlrausch-lawScience & Education
LC tank resonance f = 1/(2π√(LC)) with inductance and capacitance selectors, plus ω, period, and characteristic impedance √(L/C).
lc-oscillation-frequencyScience & Education
L = L₀/γ for any subluminal speed: contracted length, contraction percentage, and the transverse-invariance note — muon-atmosphere companion included.
length-contraction-calculatorScience & Education
1/f = (n−1)(1/R₁ − 1/R₂) with diopters, focal length, and converging/diverging classification; R = 0 marks a plano surface.
lens-maker-equation