Nerdulator

Put something in. Get everything out.

What have you got? Paste or type anything; Nerdulator works out what it is.

Try one of these

Or don’t decide: surprise me picks a page at random, and today’s page is the same one for everybody until midnight.

How it works

It works out what you gave it

A deterministic parser (regular expressions, lookup tables and range checks) decides whether you typed a number, a date, a measurement, a colour, an address or a word. If it is genuinely ambiguous, you get both readings rather than a silent guess.

It calculates everything it can

The matching engine runs every transformation it knows: factors, conversions, encodings, contrast ratios, subnet boundaries, calendar positions. Same input, same output, every time.

It links you onward

Every derived value is itself a page. The square of 47, the complement of a colour, the day after a date. All real, all one click away.

22 engines, no models

Nerdulator makes zero AI calls. Every figure on every page is computed at request time from the input you gave it. That is the whole point: a reference you can check, that gives the same answer twice, and that will still give that answer in ten years.

IP & networking
IPv4 and IPv6 address analysis, CIDR subnet and prefix calculations.
Web
URL and email address structure, parts and encodings. Syntax only, never a network lookup.
Developer identifiers
Cron expressions, UUIDs, semantic versions and checksummed identifiers, decomposed.
Reference tables
Polyhedra, paper sizes, screen resolutions, solar-system bodies and musical pitches.
Colour
HEX, RGB, HSL, HSV and CMYK conversion with contrast, harmonies and named-colour matching.
Date
Calendar position, formats, Unix time and navigation for any date from year 1 to 9999.
Units
Conversion across 20 categories and 202 units, all defined as data.
Computing
Base literals, bit widths, Unix timestamps and Base64.
Maths
Fractions, percentages, ratios, money arithmetic, statistics and expression evaluation.
Geometry
Areas, perimeters, volumes and angles for the common 2D and 3D shapes.
Science
Physical constants, chemical elements, molar masses and physics calculators.
Geography
Country reference data, coordinates, great-circle distance and bearing.
Algebra
Solves, expands and factorises single-variable equations exactly, in rational arithmetic.
Dimensions, uncertainty and sequences
What a quantity is, how well it is known, and every rule that fits a sequence. Three questions whose honest answer is not a single number.
Matrices and coordinate geometry
Determinants, inverses and eigenvalues in exact rational arithmetic, and what a set of points determines. Singular means exactly singular, not close to it.
Chemical equations
Equation balancing solved as a null space, so "cannot be balanced" is a proof rather than a failure to find an answer: and "infinitely many balancings" is a real answer too.
Electronics
Ohm's law, the power law and RC time constants. One line of algebra each, so the answers are fixed: but never a verdict on whether a part is safe.
Cards, the chessboard and entropy
Exact counting: poker hands as ratios of binomial coefficients, knight distances by exhaustive search, and the two different things people call entropy.
Games
Dice notation and dart checkouts, both by exact enumeration over a fixed rule set.
Music
Scales, chords and key signatures in twelve-tone equal temperament, spelled correctly.
Number
Integer and decimal properties: primality, factors, bases, words, powers.
Text
Character counts, case conversions, encodings, frequency and word-game scores.

What each engine can do →

The nerdy answer to oddly specific questions.