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Unit and format converters for the measurements that refuse to standardize: length, weight, temperature, speed, data sizes, cooking measures, number bases and more. Each converter applies its factors transparently so you can verify the math rather than trust a black box, and values update as you type with sensible precision for each unit.

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Unit Converter

Convert length, weight, temperature, area, volume, speed, and time.

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Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal.

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Roman Numeral Converter

Convert between Arabic numbers and Roman numerals from 1 to 3999.

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JSON ↔ YAML Converter

Convert JSON to YAML or YAML to JSON — pick the indent and copy the result.

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CSS Unit Converter

Convert between px, rem, em, pt, vw, vh, and % using your own base font size and viewport.

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Number to Words

Spell out any number in English, Korean, or Japanese — for cheques, contracts, or just clarity.

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Aspect Ratio Calculator

Convert between width × height and aspect ratio (16:9, 4:3, 21:9, …) — fit any ratio inside a container.

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Byte Size Converter (KB / KiB / MB / MiB / ...)

Convert between decimal (KB, MB, GB — SI base 1000) and binary (KiB, MiB, GiB — IEC base 1024) byte units, plus bits.

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Text to Binary Converter

Convert text to 8-bit binary and back. UTF-8 encoded, so emoji and accented characters work, with a choice of byte separator.

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Temperature Converter

Convert temperature between Celsius, Fahrenheit, Kelvin, Rankine and Réaumur — all at once.

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Area Converter

Convert area between mm², cm², m², hectares, km², in², ft², yd², acres and mi² — all at once.

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Volume Converter

Convert volume between mL, litre, m³ and US teaspoon, tablespoon, fluid ounce, cup, pint, quart and gallon — all at once.

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Weight & Mass Converter

Convert weight/mass between mg, carat, gram, kg, tonne, ounce, pound, stone, US ton and UK ton — all at once.

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Length & Distance Converter

Convert length between µm, mm, cm, m, km and inch, foot, yard, mile and nautical mile — all at once.

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GPS Coordinates Converter

Convert latitude/longitude between decimal degrees, DMS (40°42'46"N), and DMM (40°42.7666'N). Generate Google Maps and geo: URIs.

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XML ↔ JSON Converter

Convert XML to JSON and back, with full attribute support, configurable attribute prefix and text key.

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Paper Size Reference & Pixel Calculator

Browse ISO 216 A/B/C, US (Letter, Legal, ANSI), Japanese JIS-B, photo and envelope paper sizes in mm, inches and pixels at any DPI.

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Decimal ↔ Fraction Converter (with Inch-Fraction Table)

Convert any decimal into its closest fraction (adjustable maximum denominator, including 1/16″ inch fractions) and any fraction back to decimal.

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Shoe Size Converter (US / UK / EU / CM)

Convert shoe sizes between US, UK, EU, and Mondopoint (cm) for men's and women's footwear with the full chart visible.

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Specialized tools43

Tools for narrower, more technical jobs: particular file formats, standards and professional fields. They work like every other tool here, entirely in your browser.

IEEE 754 Float Converter (32 & 64-bit)

See the exact IEEE 754 bit layout of any number in float32 and float64 — sign, exponent, mantissa, hex and rounding — or decode hex back to a number.

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Two's Complement Converter (8–64 bit)

Enter a decimal, hex, binary or octal value and see its 8/16/32/64-bit two's complement bit pattern, with signed and unsigned readings.

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Gray Code Converter

Convert between decimal, binary and reflected-binary Gray code, both directions, with an optional fixed bit width and a 0-7 reference table.

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BCD Converter (Binary-Coded Decimal)

Convert decimal to and from 8421 binary-coded decimal — per-digit 4-bit nibbles, packed BCD hex bytes, and BCD validity checking.

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ISO Country, Currency and Language Codes

Search ISO 3166-1 country codes (alpha-2, alpha-3, numeric), ISO 4217 currencies and ISO 639-1 languages, with calling codes.

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CSV → SQL INSERT Generator

Convert CSV / TSV rows into SQL INSERT statements with table name, dialect quoting, type inference, and multi-row mode.

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Markdown → Plain Text

Strip all Markdown formatting and keep readable plain text — useful for previews, summaries, email, character counts.

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CSV → HTML / Markdown / JSON Table

Convert CSV to an HTML <table>, a Markdown table, or a JSON array of objects — auto-detects the delimiter.

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HTML Table to CSV Converter

Extract HTML <table> data into CSV, TSV or semicolon-separated rows, in your browser.

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HTML → Markdown Converter

Convert HTML to clean Markdown — headings, lists, links, tables, code blocks all preserved. Useful for migrating CMS content or scraping articles.

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Scientific Notation Converter

Convert any number to scientific, engineering and E-notation, with significant-figure rounding, an expanded decimal and the order of magnitude.

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Text to Hex Converter (and back)

Convert text to hexadecimal bytes and decode hex back to text, with UTF-8 support, in your browser.

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Fuel Economy Converter (MPG, L/100km, km/L)

Convert fuel economy between US MPG, Imperial MPG, litres per 100 km and kilometres per litre. Enter a value in any unit and see all the others instantly.

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Frequency Converter

Convert a frequency between Hz, kHz, MHz and GHz and its period (s, ms, µs, ns) — with angular frequency (rad/s) and RPM.

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Note Frequency Calculator

Convert a musical note to its frequency in hertz, or find the nearest note and cents detune for any frequency — with adjustable A4 reference and MIDI number.

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Pressure Converter

Convert pressure between pascals, kilopascals, megapascals, bar, psi, atmospheres and mmHg (Torr) — all at once.

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Oven Temperature Converter

Convert oven temperatures between °C, °F and gas mark, with fan (convection) settings and heat-level names.

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Air Fryer Converter

Convert oven temperature and time to air fryer settings (and back) — lower the temp ~20 °C / 25 °F and cook ~20% faster.

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Energy Converter

Convert energy between joules, kJ, MJ, calories, kcal, watt-hours, kWh, BTU, foot-pounds and eV — all at once.

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Power Converter

Convert power between watts, kW, MW, horsepower (hp & PS), BTU/h, ft·lb/s, cal/s and kcal/h — all at once.

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Force Converter

Convert force between newtons, kN, MN, dyne, gram-force, kilogram-force, ton-force, ounce-force and pound-force — all at once.

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Torque Converter

Convert torque between N·m, N·cm, kN·m, mN·m, kgf·m, kgf·cm, gf·cm, lbf·ft, lbf·in and ozf·in — all at once.

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Data Transfer Rate Converter

Convert data rate between bit/s, kbit/s, Mbit/s, Gbit/s, Tbit/s and B/s, kB/s, MB/s, GB/s, TB/s — all at once.

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Density Converter

Convert density between kg/m³, g/cm³, g/mL, kg/L and lb/ft³, lb/in³, lb/gal, oz/in³, oz/gal and slug/ft³ — all at once.

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Luminance Converter

Convert luminance between cd/m² (nits), stilb, apostilb, lambert, foot-lambert and skot — all at once.

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Magnetic Field Converter

Convert magnetic flux density between tesla, millitesla, microtesla, nanotesla (gamma), kilogauss, gauss and milligauss — all at once.

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Radiation Dose Converter (Gy, Sv, rad, rem)

Convert absorbed dose between gray and rad and equivalent dose between sievert and rem, with the weighting factor needed to cross between them.

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Viscosity Converter (Pa·s, cP, cSt, Stokes)

Convert dynamic viscosity — Pa·s, poise, centipoise, reyn — and kinematic viscosity — m²/s, stokes, centistokes — with a density field to cross over.

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Illuminance Converter

Convert illuminance between lux, kilolux, millilux, foot-candles, phot and milliphot — all at once, with lumen-per-area equivalents.

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Flow Rate Converter

Convert volumetric flow between m³/s, m³/h, L/s, L/min, L/h, mL/min, ft³/s, CFM, GPM, GPH, imperial gal/min and bbl/day — all at once.

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Acceleration Converter

Convert acceleration between m/s², cm/s² (Gal), mm/s², mGal, km/(h·s), ft/s², in/s², mph/s, kn/s and g — all at once.

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UTM & MGRS Coordinate Converter

Convert latitude/longitude to UTM and MGRS and back on WGS 84, with the grid zone, band letter, meridian convergence and point scale factor.

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CSV ↔ TSV ↔ Pipe Converter

Switch delimited text between CSV, TSV, pipe, and semicolon — with proper RFC-4180-style quoting and auto-detection.

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Fixed-Width Text Parser to CSV / JSON

Split fixed-width / fixed-column text into fields by column widths and export as CSV or JSON, in your browser.

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JSON → SQL INSERT

Turn a JSON array of objects into INSERT statements — PostgreSQL, MySQL, SQLite, or ANSI quoting, with an optional ON CONFLICT upsert tail.

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JS Object ↔ JSON

Convert a JavaScript object literal ({name: 'Alice'}) to strict JSON — or strict JSON back into a tidy JS literal with unquoted keys.

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Spreadsheet Column Converter

Convert between spreadsheet column letters and numbers — A=1, Z=26, AA=27, BC=55 — and between A1 and R1C1 cell notation.

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INI ↔ JSON Converter

Round-trip between INI-style config files and JSON — supports sections, dotted nesting, comments, and value type inference.

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TOML ↔ JSON Converter

Convert between TOML (Cargo.toml, pyproject.toml, Hugo configs) and JSON — handles tables, array-of-tables, inline tables, typed scalars.

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Geohash Encoder

Convert between latitude/longitude and geohash strings (Niemeyer 2008). Adjustable precision 1-12, with bounding box and 8 neighbor cells.

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Wire Gauge Converter (AWG ↔ mm² ↔ SWG)

Convert between AWG, wire diameter (mm and inch), cross-section (mm² and kcmil), SWG, resistance per km for copper and aluminum, and NEC ampacity.

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Pace ↔ Speed Converter (min/km, km/h, mph)

Two-way converter between running pace (min/km, min/mile) and speed (km/h, mph, m/s), with race time projections from 5K to the marathon.

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Angle Unit Converter (Degrees · Radians · Gradians · DMS)

Convert any angle between degrees, radians, gradians, turns, milliradians, arcminutes, arcseconds and DMS, with a live SVG preview and π-fraction output.

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