Free Online Unit Converters

Convert explicit units, encodings, color values, coordinates and numeric representations with free online converters.

Choose the right tool

Select the source and destination units explicitly. Distinguish mass from volume, power from energy, and decimal storage units from binary ones. Conversion does not infer density or a missing time interval.

Available tools

• Length Converter

  Convert length using explicit source and destination units.

• Weight Converter

  Convert weight using explicit source and destination units.

• Temperature Converter

  Convert temperature using explicit source and destination units.

• Area Converter

  Convert area using explicit source and destination units.

• Volume Converter

  Convert volume using explicit source and destination units.

• Speed Converter

  Convert speed using explicit source and destination units.

• Digital Storage Converter

  Convert digital storage using explicit source and destination units.

• Scientific Notation Converter

  Convert finite decimal/scientific notation without floating-point rounding.

• Energy Converter

  Convert explicit energy units using fixed conversion factors.

• Pressure Converter

  Convert explicit pressure units using fixed conversion factors.

• Angle Converter

  Convert explicit angle units using fixed conversion factors.

• Frequency Converter

  Convert explicit frequency units using fixed conversion factors.

• Duration Converter

  Convert explicit duration units using fixed conversion factors.

• Force Converter

  Convert N, kN, lbf, kgf, dyn. Reference unit: newton.

• Torque Converter

  Convert N·m, N·cm, lbf·ft, lbf·in, kgf·m. Reference unit: newton metre.

• Power Converter

  Convert W, kW, MW, mechanical hp, metric PS, BTU IT/h. Reference unit: watt.

• Acceleration Converter

  Convert m/s², cm/s², ft/s², standard g. Reference unit: metre per second squared.

• Density Converter

  Convert kg/m³, g/cm³, g/L, lb/ft³, lb/US gal. Reference unit: kilogram per cubic metre.

• Angular Velocity Converter

  Convert rad/s, degree/s, rpm, rev/s. Reference unit: radian per second.

• Volumetric Flow Rate Converter

  Convert m³/s, m³/h, L/s, L/min, US gal/min. Reference unit: cubic metre per second.

• Dynamic Viscosity Converter

  Convert Pa·s, mPa·s, cP, P. Reference unit: pascal second.

• Kinematic Viscosity Converter

  Convert m²/s, mm²/s, cSt, St. Reference unit: square metre per second.

• Surface Tension Converter

  Convert N/m, mN/m, dyn/cm. Reference unit: newton per metre.

• Illuminance Converter

  Convert lx, foot-candle, phot. Reference unit: lux.

• Luminance Converter

  Convert cd/m², nit, foot-lambert, stilb. Reference unit: candela per square metre.

• Electric Charge Converter

  Convert C, mC, µC, Ah, mAh. Reference unit: coulomb.

• Electric Current Converter

  Convert A, mA, µA, kA. Reference unit: ampere.

• Voltage Converter

  Convert V, mV, µV, kV. Reference unit: volt.

• Electrical Resistance Converter

  Convert Ω, mΩ, kΩ, MΩ. Reference unit: ohm.

• Electrical Conductance Converter

  Convert S, mS, µS, nS. Reference unit: siemens.

• Capacitance Converter

  Convert F, mF, µF, nF, pF. Reference unit: farad.

• Inductance Converter

  Convert H, mH, µH, nH. Reference unit: henry.

• Magnetic Flux Converter

  Convert Wb, mWb, µWb, Mx. Reference unit: weber.

• Magnetic Flux Density Converter

  Convert T, mT, µT, G. Reference unit: tesla.

• Electric Field Strength Converter

  Convert V/m, V/cm, kV/m, kV/cm. Reference unit: volt per metre.

• Thermal Conductivity Converter

  Convert W/(m·K), mW/(m·K), W/(cm·K), BTU IT/(h·ft·°F). Reference unit: watt per metre kelvin.

• Thermal Resistance Converter

  Convert K/W, K/kW, °F·h/BTU IT. Reference unit: kelvin per watt.

• Specific Heat Capacity Converter

  Convert J/(kg·K), kJ/(kg·K), J/(g·K), cal th/(g·°C). Reference unit: joule per kilogram kelvin.

• Heat Capacity Converter

  Convert J/K, kJ/K, cal th/K, kcal th/K. Reference unit: joule per kelvin.

• Molar Concentration Converter

  Convert mol/m³, mol/L, mmol/L, µmol/L. Reference unit: mole per cubic metre.

• Molar Mass Converter

  Convert kg/mol, g/mol, mg/mol, kg/kmol. Reference unit: kilogram per mole.

• Data Transfer Rate Converter

  Convert bit/s, kbit/s, Mbit/s, Gbit/s, B/s, MB/s, MiB/s. Reference unit: bit per second.

• Typography Length Converter

  Convert CSS px, pt, pc, in, cm, mm. Reference unit: CSS pixel at 96 pixels per inch.

• Roman Numeral Converter

  Convert integers 1–3999 to canonical Roman numerals and back.

• Numeral Script Converter

  Convert decimal digit glyphs among ASCII, Arabic-Indic, Persian and Devanagari.

• Decimal Degrees and DMS Converter

  Convert decimal angle degrees to degree/minute/second notation or back.

• Base58 Text Converter

  Encode UTF-8 bytes with the Bitcoin Base58 alphabet or decode them.

• Ascii85 Text Converter

  Encode UTF-8 bytes as Adobe-style Ascii85 or decode strict Ascii85 text.

• Custom Alphabet Integer Converter

  Convert a non-negative decimal integer to an explicit positional alphabet or back.

• Binary Coded Decimal Converter

  Convert unsigned decimal digits to four-bit BCD nibbles or back.

• Binary and Gray Code Converter

  Convert binary bit strings to reflected Gray code and back.

• Byte Order Swapper

  Reverse bytes inside fixed-width groups.

• Signed Two’s Complement Converter

  Convert signed integers to fixed-width two’s complement bits or back.

• IEEE 754 Floating-Point Inspector

  Inspect 32-bit or 64-bit IEEE binary representation of a finite decimal number.

• Bit Position Mask Builder

  Build an exact unsigned mask from selected zero-based bit positions.

• 32-Bit Bitwise Calculator

  Compute unsigned 32-bit AND, OR, XOR and bitwise inversions.

• MAC Address Formatter and Inspector

  Normalize a 48-bit MAC address and inspect multicast/local flag bits.

• HEX RGB and HSL Color Converter

  Convert hex or RGB input to hex, RGB and HSL representations.

• Approximate RGB CMYK Converter

  Convert hex RGB to a simple unprofiled CMYK percentage approximation.

• Two-Color RGB Blend Calculator

  Interpolate two sRGB channel values at an explicit blend fraction.

• PX REM and EM Converter

  Convert pixel values to relative font units using an explicit pixel reference.

• Temperature Difference Converter

  Convert temperature intervals without applying absolute-temperature offsets.

• Fuel Consumption Unit Converter

  Convert between L/100 km, km/L, US mpg and imperial mpg.

• Nanosecond Unix Timestamp Converter

  Convert exact integer Unix nanoseconds to seconds, millisecond date and submillisecond remainder.

• Gzip Text Compressor and Decoder

  Compress UTF-8 text to Base64 Gzip, or decode a bounded Gzip text payload.

• Unicode Literal Escape Converter

  Convert code points to Unicode brace escapes or decode common Unicode escape spellings.

• Locale Number to Canonical Decimal

  Normalize explicitly chosen decimal/group separator conventions into canonical numeric text.

• Exact Currency Minor Unit Converter

  Convert decimal amounts to exact integer minor units or back with an explicit scale.

• Exact Minor Unit Bill Splitter

  Split a non-negative integer minor-unit total evenly, allocating indivisible remainders explicitly.

• Delimited Text Separator Detector

  Compare comma, semicolon, tab and pipe parsing for consistent column counts.

• Geohash Encoder and Decoder

  Encode latitude/longitude into Geohash or decode a cell’s bounding box.

• Great-Circle Distance Calculator

  Estimate spherical distance between two latitude/longitude pairs.

• Web Mercator Coordinate Converter

  Convert longitude/latitude to Web Mercator metres and back.

• Encoded Polyline Coordinate Converter

  Encode latitude/longitude coordinate arrays to Google-style polylines and decode them.

• WKT and GeoJSON Geometry Converter

  Convert simple two-dimensional Point, LineString and Polygon geometries.

• GPX and GeoJSON Track Converter

  Convert a simple GeoJSON track to GPX, or combine GPX track points into one line.

• KML and GeoJSON Geometry Converter

  Convert one simple geographic Point or LineString between KML and GeoJSON.

• CSV Coordinates to GeoJSON Points

  Convert explicit latitude/longitude CSV fields into a GeoJSON feature collection.

• GeoJSON Geometry Bounding Box

  Report minimum and maximum longitude/latitude for one supported geometry.

• Planar Polygon Centroid Calculator

  Calculate signed area and centroid of one simple closed planar polygon ring.

• Mass Flow Rate Converter

  Convert kg/s, kg/h, g/s, lb/min, lb/h using explicit multiplicative reference factors.

• Areal Mass Density Converter

  Convert kg/m², g/m², oz/yd², lb/ft² using explicit multiplicative reference factors.

• Textile Linear Density Converter

  Convert tex, dtex, denier, kg/km using explicit multiplicative reference factors.