Converters & Lookups
Reference tables and quick validators.
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ABV ↔ Proof Converter Convert between alcohol by volume, US proof and UK (Sikes) proof.
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Airport Code Lookup Find IATA / ICAO codes, coordinates and timezone for ~200 major airports worldwide.
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ASL Alphabet (Fingerspelling) Text descriptions of each handshape in the ASL alphabet.
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Babylonian Numerals Convert integers to Babylonian base-60 cuneiform numerals.
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Beaufort Wind Scale Beaufort number, knots, km/h and sea-state description.
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BIC Syntax Validator Validate SWIFT/BIC code structure.
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Boiling Point at Altitude Approximate water boiling point as a function of elevation.
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Braille Converter Translate Latin text to Grade-1 (uncontracted) Braille.
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Camera Aperture / Shutter / ISO Reference Stops of aperture, shutter speed and ISO with reciprocity notes.
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Capacitor Color Code Decode the (legacy) capacitor color-band system.
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Clothing Size Conversions US ↔ UK ↔ EU ↔ JP clothing and shoe sizes.
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Coffee Brew Ratio Common coffee:water ratios with a quick water calculator.
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Constellation Reference IAU constellations with abbreviation and genitive case.
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Cooking Conversions Cups, tablespoons, fluid ounces, grams, °F/°C.
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Country Code Reference Search common ISO country codes.
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Currency Symbol Reference Search common currency codes and symbols.
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Drill Bit / Screw Size Reference Inch fractional and screw-size drill bits cross-referenced to mm.
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Egyptian Numerals Convert integers to Egyptian hieroglyphic numerals.
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Ethernet T568A/B Pinout RJ-45 pin colour assignments for T568A and T568B.
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File Magic Bytes Detect file type from the first few bytes.
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Greek Alphabet α β γ δ — Greek letters with pronunciation.
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HTTP Method Reference GET / POST / PUT / DELETE — safe? idempotent? body?
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IATA / ICAO Airport Code Reference Look up major airports by IATA, ICAO or city name.
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ISBN / UPC / EAN Validator & Generator Validate or generate ISBN-10, ISBN-13, UPC-A, EAN-8 and EAN-13 codes with an inline SVG barcode.
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ISBN Validator Validate ISBN-10 and ISBN-13 check digits.
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ISO 639 Language Code Reference Search ISO 639-1 / 639-2 language codes.
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ISSN Validator Validate ISSN check digits.
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Italian Music Tempo Reference Italian tempo terms (Largo, Andante, Allegro, Presto) with BPM ranges.
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Math Symbols Reference ≠ ≤ ∞ ∂ ∫ ∑ — common math symbols, names and LaTeX.
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Maya Numerals Convert integers to Maya vigesimal numerals (dots, bars, shell).
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Mohs Hardness Scale 1–10 Mohs hardness reference for minerals.
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Music Note Frequencies Equal-temperament frequencies for every MIDI note.
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Paper Size Reference ISO A/B-series and US paper sizes in millimeters and inches.
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Periodic Table Lookup Search chemical elements by symbol, name or atomic number.
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Recipe Substitutions Common ingredient swaps for baking and cooking.
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Ring Size Converter Convert ring sizes between US, UK, EU and JP systems.
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SI Prefix Reference From quetta (Q, 10³⁰) down to quecto (q, 10⁻³⁰).
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Steak Doneness Reference Internal temperatures and appearance for rare → well-done.
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Time Zone Abbreviation Lookup Look up time zone abbreviations like PST, AEDT, IST and their UTC offsets.
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Tire Size Decoder Decode a metric tire size like 225/45R17.
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TLD Reference Top-level domains: gTLDs, sTLDs and popular country codes.
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USB / HDMI / DP Pinout Pin reference for USB-A, USB-B, USB-C, HDMI Type A and DisplayPort.