Converters & Lookups

Convert between alcohol by volume, US proof and UK (Sikes) proof.

Find IATA / ICAO codes, coordinates and timezone for ~200 major airports worldwide.

Text descriptions of each handshape in the ASL alphabet.

Convert integers to Babylonian base-60 cuneiform numerals.

Beaufort number, knots, km/h and sea-state description.

Validate SWIFT/BIC code structure.

Find the birthstone and birth flower for any month.

See which blood types can donate to and receive from a given type.

Approximate water boiling point as a function of elevation.

Translate Latin text to Grade-1 (uncontracted) Braille.

Stops of aperture, shutter speed and ISO with reciprocity notes.

Decode the (legacy) capacitor color-band system.

US ↔ UK ↔ EU ↔ JP clothing and shoe sizes.

Common coffee:water ratios with a quick water calculator.

IAU constellations with abbreviation and genitive case.

Cups, tablespoons, fluid ounces, grams, °F/°C.

Search common ISO country codes.

Search common currency codes and symbols.

Convert between decimal (KB/MB/GB) and binary (KiB/MiB/GiB) data sizes.

Inch fractional and screw-size drill bits cross-referenced to mm.

Convert integers to Egyptian hieroglyphic numerals.

RJ-45 pin colour assignments for T568A and T568B.

Detect file type from the first few bytes.

α β γ δ — Greek letters with pronunciation.

Quick reference: typical public holiday names for major countries.

GET / POST / PUT / DELETE — safe? idempotent? body?

Look up major airports by IATA, ICAO or city name.

Validate or generate ISBN-10, ISBN-13, UPC-A, EAN-8 and EAN-13 codes with an inline SVG barcode.

Validate ISBN-10 and ISBN-13 check digits.

Search ISO 639-1 / 639-2 language codes.

Validate ISSN check digits.

Italian tempo terms (Largo, Andante, Allegro, Presto) with BPM ranges.

Convert a stitch/row gauge into the cast-on stitches and rows for a target size.

Common knots with category, use case and tying steps.

Common Latin phrases with pronunciation, translation and usage.

ICS single-flag meanings A–Z (Alfa…Zulu).

≠ ≤ ∞ ∂ ∫ ∑ — common math symbols, names and LaTeX.

Convert integers to Maya vigesimal numerals (dots, bars, shell).

1–10 Mohs hardness reference for minerals.

Compute molar mass (g/mol) from a chemical formula, with per-element breakdown.

Equal-temperament frequencies for every MIDI note.

Look up hurricane (Saffir-Simpson), tornado (EF) and earthquake (Richter) scales.

FDA Daily Values (DV) used on US nutrition facts labels.

ISO A/B-series and US paper sizes in millimeters and inches.

Search chemical elements by symbol, name or atomic number.

Look up common radio ten-codes (10-4, 10-20, etc.) by code or meaning.

Postal code patterns and example for major countries.

Common ingredient swaps for baking and cooking.

Convert ring sizes between US, UK, EU and JP systems.

Flag semaphore positions for letters A–Z.

Look up sheet-metal thickness (mm and inches) by gauge for steel, galvanized, stainless and aluminium.

From quetta (Q, 10³⁰) down to quecto (q, 10⁻³⁰).

Internal temperatures and appearance for rare → well-done.

Look up time zone abbreviations like PST, AEDT, IST and their UTC offsets.

Decode a metric tire size like 225/45R17.

Top-level domains: gTLDs, sTLDs and popular country codes.

Pin reference for USB-A, USB-B, USB-C, HDMI Type A and DisplayPort.

Find the traditional and modern gift for any wedding anniversary year.