Converters & Lookups

Reference tables and quick validators.

58 tools

ABV ↔ Proof Converter Convert between alcohol by volume, US proof and UK (Sikes) proof.
Airport Code Lookup Find IATA / ICAO codes, coordinates and timezone for ~200 major airports worldwide.
ASL Alphabet (Fingerspelling) Text descriptions of each handshape in the ASL alphabet.
Babylonian Numerals Convert integers to Babylonian base-60 cuneiform numerals.
Beaufort Wind Scale Beaufort number, knots, km/h and sea-state description.
BIC Syntax Validator Validate SWIFT/BIC code structure.
Birthstone & Birth Flower Lookup Find the birthstone and birth flower for any month.
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Blood Type Compatibility See which blood types can donate to and receive from a given type.
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Boiling Point at Altitude Approximate water boiling point as a function of elevation.
Braille Converter Translate Latin text to Grade-1 (uncontracted) Braille.
Camera Aperture / Shutter / ISO Reference Stops of aperture, shutter speed and ISO with reciprocity notes.
Capacitor Color Code Decode the (legacy) capacitor color-band system.
Clothing Size Conversions US ↔ UK ↔ EU ↔ JP clothing and shoe sizes.
Coffee Brew Ratio Common coffee:water ratios with a quick water calculator.
Constellation Reference IAU constellations with abbreviation and genitive case.
Cooking Conversions Cups, tablespoons, fluid ounces, grams, °F/°C.
Country Code Reference Search common ISO country codes.
Currency Symbol Reference Search common currency codes and symbols.
Data Storage Unit Converter Convert between decimal (KB/MB/GB) and binary (KiB/MiB/GiB) data sizes.
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Drill Bit / Screw Size Reference Inch fractional and screw-size drill bits cross-referenced to mm.
Egyptian Numerals Convert integers to Egyptian hieroglyphic numerals.
Ethernet T568A/B Pinout RJ-45 pin colour assignments for T568A and T568B.
File Magic Bytes Detect file type from the first few bytes.
Greek Alphabet α β γ δ — Greek letters with pronunciation.
Holiday List by Country Quick reference: typical public holiday names for major countries.
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HTTP Method Reference GET / POST / PUT / DELETE — safe? idempotent? body?
IATA / ICAO Airport Code Reference Look up major airports by IATA, ICAO or city name.
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.
ISBN Validator Validate ISBN-10 and ISBN-13 check digits.
ISO 639 Language Code Reference Search ISO 639-1 / 639-2 language codes.
ISSN Validator Validate ISSN check digits.
Italian Music Tempo Reference Italian tempo terms (Largo, Andante, Allegro, Presto) with BPM ranges.
Knitting Gauge Calculator Convert a stitch/row gauge into the cast-on stitches and rows for a target size.
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Knot Tying Reference Common knots with category, use case and tying steps.
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Latin Phrases Reference Common Latin phrases with pronunciation, translation and usage.
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Maritime Signal Flag Reference ICS single-flag meanings A–Z (Alfa…Zulu).
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Math Symbols Reference ≠ ≤ ∞ ∂ ∫ ∑ — common math symbols, names and LaTeX.
Maya Numerals Convert integers to Maya vigesimal numerals (dots, bars, shell).
Mohs Hardness Scale 1–10 Mohs hardness reference for minerals.
Molar Mass Calculator Compute molar mass (g/mol) from a chemical formula, with per-element breakdown.
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Music Note Frequencies Equal-temperament frequencies for every MIDI note.
Natural Hazard Scales Reference Look up hurricane (Saffir-Simpson), tornado (EF) and earthquake (Richter) scales.
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Nutrient Daily Values Reference FDA Daily Values (DV) used on US nutrition facts labels.
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Paper Size Reference ISO A/B-series and US paper sizes in millimeters and inches.
Periodic Table Lookup Search chemical elements by symbol, name or atomic number.
Police Ten-Codes Reference Look up common radio ten-codes (10-4, 10-20, etc.) by code or meaning.
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Postal Code Format Reference Postal code patterns and example for major countries.
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Recipe Substitutions Common ingredient swaps for baking and cooking.
Ring Size Converter Convert ring sizes between US, UK, EU and JP systems.
Semaphore Alphabet Flag semaphore positions for letters A–Z.
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Sheet-Metal Gauge Chart Look up sheet-metal thickness (mm and inches) by gauge for steel, galvanized, stainless and aluminium.
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SI Prefix Reference From quetta (Q, 10³⁰) down to quecto (q, 10⁻³⁰).
Steak Doneness Reference Internal temperatures and appearance for rare → well-done.
Time Zone Abbreviation Lookup Look up time zone abbreviations like PST, AEDT, IST and their UTC offsets.
Tire Size Decoder Decode a metric tire size like 225/45R17.
TLD Reference Top-level domains: gTLDs, sTLDs and popular country codes.
USB / HDMI / DP Pinout Pin reference for USB-A, USB-B, USB-C, HDMI Type A and DisplayPort.
Wedding Anniversary Gift Lookup Find the traditional and modern gift for any wedding anniversary year.
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