Convert

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

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

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

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

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

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

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

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

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

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

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

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

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

Generate a `[text](#anchor)` TOC from Markdown headings — bullet, numbered, or HTML output with GitHub/GitLab/simple slug styles.

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

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

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

Decode 4/5/6-band axial resistors into ohm value with tolerance — interactive color picker, gold/silver multipliers and tolerances supported.

Decode 3-digit ceramic capacitor codes (104, 473K, 4R7) into picofarads, nanofarads and microfarads, with the tolerance-letter lookup.

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

Solve V, I, R, P from any two known values. V=IR, P=VI, P=V²/R, P=I²R — pick which pair you have, get the other two instantly.

Compute the output voltage of a two-resistor divider, or find the R2 you need for a target output, plus current and power dissipation.

Find capacitive reactance (Xc), inductive reactance (XL), or the LC resonant frequency, with pF–F, nH–H and Hz–GHz unit pickers.

Size the current-limiting resistor for an LED (or a series string) from supply voltage, forward voltage and current — with the nearest E24 value and power rating.

Convert between mass, moles, volume and molar concentration of a solution — solve for molarity, the mass to weigh out, or the volume to make up.

Calculate the molar mass and percent composition of any chemical formula, with parentheses and hydrates, in your browser.

Apply C₁V₁ = C₂V₂ to find any unknown — the stock volume to take, the final volume, or either concentration — plus the amount of solvent to add.

Convert between pH, pOH, [H⁺] and [OH⁻] at 25 °C — enter any one and get the other three, plus an acidic / neutral / basic verdict.

Solve PV = nRT for pressure, volume, moles or temperature, with Pa/kPa/bar/atm/mmHg/psi, mL/L/m³, mol/mmol and K/°C/°F units.

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

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

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

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.

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

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.

Calculate the frequency an observer hears when a source or observer moves — set the emitted frequency, wave speed and each speed and direction to get the shifted frequency and wavelength.

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

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

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

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

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

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

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

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

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.

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

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

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

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.

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.

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

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

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

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.

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.

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

Paste an SRT or WebVTT file, type an offset in seconds, and get every cue shifted forward or backward.

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

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

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

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

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

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

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

Convert XML to JSON and back, with full attribute support, configurable attribute prefix and text key. Browser-native DOMParser handles namespaces, CDATA, comments.

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

Browse ISO 216 A/B/C, US (Letter/Legal/Tabloid/ANSI), Japanese JIS-B, photo and envelope paper sizes — see millimeters, inches and pixel dimensions at any DPI, plus side-by-side size comparison.

Convert between decibels and linear ratios for either voltage/SPL (20·log) or power (10·log), sum multiple dB SPL sources logarithmically, and look up reference levels (dBV, dBu, dBm, dBFS, dB SPL, dBW, dBi) and common everyday loudness values.

Convert between American Wire Gauge (AWG), wire diameter (mm and inch), cross-section area (mm² and kcmil), British Standard Wire Gauge (SWG), resistance per km/1000ft for copper and aluminum, and NEC ampacity tables for chassis wiring and power transmission.

Two-way converter between running pace (min/km, min/mile) and speed (km/h, mph, m/s, knots) with race time projections for 100 m, 400 m, mile, 5K, 10K, half marathon, and marathon at the chosen pace.

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

Convert any decimal into its closest fraction (with adjustable maximum denominator, including binary fractions for inch measurements), and any fraction back into decimal / percent. Includes side-by-side common-fraction and 1/16″ inch-fraction reference tables.

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