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Conversion Calculators

Convert between units of length, weight, temperature, volume, speed and more, instantly.

100 calculatorsLength, weight, temperature & units

Most popular

Length ConverterConvert between millimeters, centimeters, meters, kilometers, inches, feet, yards and miles.Weight ConverterConvert between milligrams, grams, kilograms, ounces, pounds and stone.Temperature ConverterConvert temperatures between Celsius, Fahrenheit and Kelvin.Volume ConverterConvert between milliliters, liters, teaspoons, tablespoons, cups, pints, quarts and gallons.

All calculators

Speed ConverterConvert between mph, km/h, m/s, knots and feet per second.
Area ConverterConvert between square meters, square feet, acres, hectares and more.
Data Storage ConverterConvert between bits, bytes, kilobytes, megabytes, gigabytes and terabytes.
Pressure ConverterConvert between pascals, bar, PSI, atmospheres and mmHg.
Energy ConverterConvert between joules, calories, kilocalories, watt-hours and BTU.
Power ConverterConvert between watts, kilowatts, horsepower and BTU per hour.
Angle ConverterConvert between degrees, radians and gradians.
Time ConverterConvert between seconds, minutes, hours, days, weeks and years.
Frequency ConverterConvert between hertz, kilohertz, megahertz and gigahertz.
Torque ConverterConvert between newton-meters, pound-feet and pound-inches.
Fuel Economy ConverterConvert fuel economy between miles per gallon (US) and liters per 100 km.
Clothing Size ConverterConvert women's clothing sizes between US, UK and EU sizing.
Force ConverterConvert between newtons, kilonewtons, pound-force, kilogram-force and dyne.
Density ConverterConvert between kg/m³, g/cm³, lb/ft³ and lb/gal.
Angular Velocity ConverterConvert rotational speed between RPM, radians/sec, degrees/sec and hertz.
Flow Rate ConverterConvert liquid flow rate between liters/min, gallons/min, m³/hour and CFM.
Illuminance ConverterConvert light levels between lux and foot-candles.
Voltage ConverterConvert electrical voltage between millivolts, volts and kilovolts.
Electric Current ConverterConvert electric current between microamps, milliamps, amps and kiloamps.
Electric Charge ConverterConvert electric charge between coulombs, millicoulombs, amp-hours and milliamp-hours.
Magnetic Flux Density ConverterConvert magnetic field strength between tesla, millitesla and gauss.
Radiation Dose ConverterConvert absorbed and effective radiation dose between gray, rad, sievert and rem.
Radioactivity ConverterConvert radioactive decay rate between becquerel and curie.
Kinematic Viscosity ConverterConvert kinematic viscosity between m²/s, stokes and centistokes.
Dynamic Viscosity ConverterConvert dynamic (absolute) viscosity between pascal-seconds, poise and centipoise.
Data Transfer Rate ConverterConvert internet and network speed between bits, kilobits, megabits and gigabits per second.
Linear Mass Density ConverterConvert mass per unit length between kg/m, g/m and lb/ft.
Specific Energy ConverterConvert energy density between J/kg, Wh/kg, kcal/kg and BTU/lb.
Capacitance ConverterConvert electrical capacitance between picofarads, nanofarads, microfarads and farads.
Inductance ConverterConvert electrical inductance between microhenries, millihenries and henries.
Acceleration ConverterConvert acceleration between standard gravity (g), m/s² and ft/s².
Men's Clothing Size ConverterConvert men's suit and jacket sizes between US, UK and EU sizing.
Kids' Clothing Size ConverterEstimate a child's clothing size in US, UK and EU (height-based) sizing from their age.
Ring Size ConverterConvert a measured ring circumference into a US ring size.
Hat Size ConverterConvert head circumference into US/UK hat size and metric (EU) hat size.
Belt Size ConverterEstimate your belt size from your pant waist size, in both US inches and EU centimeters.
Shirt Collar Size ConverterConvert neck circumference into US/UK shirt collar size (inches) and EU collar size (cm).
Glove Size ConverterConvert hand circumference into standard US/UK glove size.
Mattress Size ConverterCompare standard US and UK/EU mattress sizes in both inches and centimeters.
Paper Size ConverterLook up the exact dimensions of ISO A-series and US paper sizes in millimeters and inches.
Paper Weight (GSM to lb) ConverterConvert paper weight between GSM (grams per square meter) and US pound weight for bond, text, and cover stock.
Screen Diagonal to Width/Height ConverterCalculate a screen's actual width and height from its diagonal size and aspect ratio.
Aspect Ratio CalculatorSimplify a width and height into a standard aspect ratio like 16:9 or 4:3.
Image Print Size (DPI) ConverterCalculate the physical print size of an image based on its pixel dimensions and resolution (DPI).
Video Resolution ConverterLook up the exact pixel dimensions and total megapixels behind names like 1080p, 4K and 8K.
Megapixels to Resolution ConverterEstimate a camera's pixel dimensions from its megapixel count and aspect ratio.
CSS Font Size Unit ConverterConvert CSS font sizes between pixels, points, em, rem and percent.
Number Base ConverterConvert a whole number between decimal, binary, octal and hexadecimal.
ASCII Character Code ConverterConvert an ASCII decimal code into its character, hexadecimal and binary representation.
Fraction to Decimal ConverterConvert a fraction into its decimal equivalent.
Decimal to Fraction ConverterConvert a decimal number into a simplified fraction.
Percent to Ratio ConverterConvert a percentage into a simplified X:Y ratio.
CIDR to Subnet Mask ConverterConvert a CIDR prefix length into a subnet mask, wildcard mask and usable host count.
IP Address to Binary ConverterConvert an IPv4 address between dotted-decimal and binary notation.
Download Time CalculatorEstimate how long a file will take to download or upload at a given internet speed.
US MPG to UK MPG ConverterConvert fuel economy between US MPG, UK (Imperial) MPG and kilometers per liter.
Tire Size to Diameter ConverterCalculate a tire's overall diameter and circumference from its metric sidewall specification.
Engine Displacement ConverterConvert engine displacement between cubic centimeters, liters and cubic inches.
Wire Gauge (AWG) ConverterConvert American Wire Gauge (AWG) into diameter and cross-sectional area.
Sheet Metal Gauge ConverterConvert sheet metal gauge number into thickness for steel and aluminum.
Pipe Size (NPS) ConverterLook up the actual outer diameter for a Nominal Pipe Size (NPS) designation.
Metric to Imperial Bolt Size ConverterFind the closest imperial fractional-inch diameter for a metric bolt size.
Drill Bit Size ConverterConvert a decimal drill bit measurement into the nearest fractional inch and millimeter size.
Battery Capacity (mAh to Wh) ConverterConvert a battery's mAh rating into watt-hours using its voltage.
Watts to Amps ConverterCalculate current draw in amps from a device's power rating and voltage.
kWh to kW ConverterCalculate average power draw in kilowatts from energy used over a period of time.
Lumens to Watts Equivalent ConverterEstimate the wattage needed to produce a target brightness for LED, CFL and incandescent bulbs.
Color Temperature (Kelvin) ConverterLook up what a light's Kelvin rating means in terms of warm, neutral or cool white appearance.
Camera F-Stop ConverterSee how much light an f-stop lets in relative to f/1.0, and how many stops it is from wide open.
Astronomical Distance ConverterConvert astronomical distances between kilometers, astronomical units, light-years and parsecs.
Troy Ounce to Gram ConverterConvert troy ounces (used for precious metals) into grams and regular avoirdupois ounces.
Carat to Gram ConverterConvert gemstone weight between metric carats, grams and points.
Gold Purity (Karat) ConverterConvert gold karat (e.g. 14K, 18K, 24K) into purity percentage and millesimal fineness.
Nautical Mile ConverterConvert nautical miles into statute (land) miles and kilometers.
Planet Day Length ConverterSee how long one day (a full rotation) lasts on each planet, in Earth hours.
Mach Number ConverterConvert Mach number into mph, km/h and knots using the standard sea-level speed of sound.
DMS to Decimal Degrees ConverterConvert GPS coordinates from degrees-minutes-seconds (DMS) into decimal degrees.
Decimal Time ConverterConvert hours and minutes into decimal hours for timesheets and payroll.
Time Zone Offset ConverterConvert a time from one UTC offset to another.
Military Time ConverterConvert between 12-hour clock time and 24-hour military time.
Video Frame to Timecode ConverterConvert a total frame count into hh:mm:ss:ff timecode at a given frame rate.
Ton Types ConverterConvert between US (short) tons, UK (long) tons and metric tonnes - three different weights that share the name "ton."
Decimal Feet to Feet & Inches ConverterConvert a decimal feet measurement (like 5.75 ft) into feet and inches (5'9").
Centimeters to Feet & Inches ConverterConvert a height or length in centimeters into feet and inches.
RGB to HSL ConverterConvert an RGB color value into HSL (hue, saturation, lightness).
CMYK to RGB ConverterConvert a CMYK print color value into RGB for screen display.
Decibel to Ratio ConverterConvert a decibel (dB) value into its underlying power ratio and amplitude ratio.
Wavelength to Frequency ConverterConvert light wavelength into frequency using the speed of light.
Musical Note to Frequency ConverterFind the frequency in Hz of any musical note using standard equal-temperament tuning (A4 = 440Hz).
BPM to Milliseconds ConverterConvert a track's BPM (beats per minute) into millisecond delay and note-length timing for music production.
Metric Prefix ConverterConvert a value between metric prefixes like nano, micro, milli, kilo, mega and giga.
Beaufort Scale ConverterConvert a Beaufort wind force number into wind speed and its observable description.
Earthquake Magnitude to Energy ConverterEstimate the seismic energy released by an earthquake of a given magnitude.
Candlepower to Lumens ConverterConvert candlepower (candela) into total lumens for a uniform point light source.
Pica to Inches ConverterConvert typography picas into points, inches and centimeters.
Knitting Needle Size ConverterConvert knitting needle sizes between US, UK/Canadian and metric (mm).

About Conversion Calculators

Unit conversion only has one job: be exactly right. Every converter here uses precise, standard conversion factors - not rounded rules of thumb - across length, weight, temperature, volume, speed and more.