Converters Tools

Convert between units, number bases, time formats, colors, and text encodings with these free browser-based converters. Fast, accurate, and completely private — nothing is uploaded.

Convert numbers and notation

Number Base Converter

Convert numbers between binary, octal, decimal and hexadecimal.

Roman Numeral Converter

Convert between Roman numerals and numbers from 1 to 3999, in either direction.

Number to Words

Spell any number out in English words, including decimals and negatives.

Fraction to Decimal

Convert fractions to decimals and decimals back to a simple fraction.

Scientific Notation Converter

Convert between plain decimal numbers and scientific (E) notation.

Arbitrary Base Converter

Convert whole numbers between any bases from 2 to 36, with exact BigInt math.

Decimal to Fraction Calculator

Convert a decimal (including repeating decimals) into an exact fraction in lowest terms and a mixed number, or a fraction back to a decimal.

SI / Metric Prefix Converter

Rescale a number between SI metric prefixes — nano, micro, milli, kilo, mega, giga and the full quecto-to-quetta range — for any base unit.

IEEE-754 Floating-Point Converter

Convert a decimal number to/from its IEEE-754 single (32-bit) or double (64-bit) bit pattern and dissect the sign, exponent and mantissa fields.

Two's Complement Converter

Convert signed integers to/from two's-complement binary and hex at 4, 8, 16, 32 or 64-bit width, with one's complement and unsigned interpretation.

Convert text and digital data

Base32 Encoder/Decoder

Encode text to Base32 or decode Base32 back to text, per RFC 4648.

Hex ↔ Text

Convert text to hexadecimal bytes and decode hex back to text.

ASCII Table

Browse and search the full 0–127 ASCII table with decimal, hex, octal and names.

IP Address Converter

Convert an IPv4 address to integer, hex and dotted binary, and back.

Text to Data URI

Wrap text, CSS, SVG, HTML or JSON into a data: URI.

Byte Size Humanizer

Turn a byte count into a human-readable size and parse a size string back to bytes.

Unicode Code Point Converter

Inspect text and convert each character to its Unicode code point, UTF-8/UTF-16 bytes, HTML entity and escape — or rebuild text from code points.

Convert time and data rates

Timestamp Converter

Convert Unix timestamps to human dates and back, in your local time zone.

Seconds to Duration

Convert a number of seconds into a readable duration and parse a duration back to seconds.

Data Transfer Rate Converter

Convert data speeds between bit/s, kbps, Mbps, Gbps and byte rates like MB/s, KiB/s and MiB/s.

Frequency Converter

Convert frequency between Hz, kHz, MHz, GHz, THz, RPM, rad/s, deg/s and BPM in your browser.

Download / Upload Time Calculator

Estimate how long a file takes to download or upload at a given internet speed, in hours, minutes and seconds.

Convert design and print values

Color Converter

Convert colors between HEX, RGB and HSL with a live preview.

CSS Unit Converter

Convert a CSS length between px, rem, em, pt, pc, in and cm.

Color Temperature to RGB

Convert a Kelvin color temperature into an approximate RGB color and hex code.

PPI / Pixel Density Calculator

Calculate a screen's PPI, dot pitch, megapixels and aspect ratio from its resolution and diagonal size.

Paper Weight Converter (GSM ⇄ lb)

Convert printing-paper weight between GSM (g/m²) and US basis-weight pounds for bond, text, cover, index, tag and bristol stock.

Convert everyday measurements

Unit Converter

Convert length, mass, temperature, data and speed units instantly.

Length & Distance Converter

Convert any length or distance between mm, cm, m, km, inches, feet, yards, miles and nautical miles — all units shown at once in a live grid.

Weight & Mass Converter

Convert weight and mass between mg, g, kg, tonnes, ounces, pounds, stone, tons, carats and troy units — every unit shown together in a live grid.

Temperature Converter

Convert temperature between Celsius, Fahrenheit, Kelvin, Rankine and Réaumur — all five scales shown at once, with an absolute-zero guard.

Volume Converter

Convert volume between gallons, litres, quarts, pints, cups, fluid ounces and cubic units.

Area Converter

Convert area between mm², cm², m², ares, hectares, km², square inches/feet/yards, acres and square miles — every unit shown at once.

Height Converter (cm ⇄ ft+in)

Convert body height between centimetres and feet-plus-inches (e.g. 175 cm = 5' 9"), with total inches and metres shown too.

Density Converter

Convert mass density between kg/m³, g/cm³, g/mL, lb/ft³, lb/in³, lb/gal (US & UK), oz/in³ and slug/ft³ with exact factors.

Convert engineering units

Angle Converter

Convert angles between degrees, radians, gradians and turns.

Pressure Converter

Convert pressure between Pascal, kPa, MPa, bar, PSI, atm, Torr and inHg instantly in your browser.

Energy Converter

Convert energy between joules, kilojoules, calories, kilocalories, watt-hours, kWh, BTU and more.

Power Converter

Convert power between watts, kilowatts, megawatts, horsepower, BTU/hour and more, in your browser.

Force Converter

Convert force between newtons, kilonewtons, dyne, kilogram-force, pound-force, ounce-force and more.

Torque Converter

Convert torque between newton-metre, N·cm, kN·m, kgf·m, pound-force foot, lbf·in and ozf·in.

Flow Rate Converter

Convert volumetric flow rate between GPM, L/min, L/s, CFM, m³/h, m³/s, GPH and mL/s instantly in your browser.

Illuminance Converter

Convert illuminance between lux, foot-candle, lumen/m², phot and nox instantly in your browser.

Convert travel and location values

GPS Coordinate Converter

Convert coordinates between decimal degrees and degrees-minutes-seconds.

Fuel Economy Converter

Convert fuel economy between US MPG, UK MPG, L/100km and km/L at once.

Coordinate Distance Calculator

Great-circle distance and bearing between two lat/lon points using the haversine formula, in km, miles and nautical miles.

Beaufort Wind Scale Converter

Convert wind speed (mph, km/h, knots, m/s) to a Beaufort force and back, with the force name, sea state, effects and typical wave height.

Speed & Velocity Converter

Convert speed between m/s, km/h, mph, knots, ft/s, ft/min and Mach — all units shown at once, with a sea-level Mach note.

Convert cooking and clothing sizes

Cooking Measurement Converter

Convert between cups, tablespoons, teaspoons, fluid ounces, millilitres and litres.

Shoe Size Converter

Convert shoe sizes between US, UK, EU, Japan (cm), China and foot length for men, women and kids.

Ring Size Converter

Convert ring sizes between US, UK letters, EU/ISO, Japan and inner diameter or circumference in mm.

Clothing Size Converter

Convert women's dress, men's shirt and men's suit sizes between US, UK, EU, IT, FR, JP and AU — sizes vary by brand, so always check the brand's own chart.

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