Online Conversion

Online Conversion is a resource for weights, measures, calculators, converters. Perform conversions between 2100 various units of measure in more than 70 categories.

Acceleration Convert

In mechanics, acceleration is the rate of change of the velocity of an object with respect to time. Accelerations are vector quantities (in that they have magnitude and direction). The orientation of an object's acceleration is given by the orientation of the net force acting on that object. The magnitude of an object's acceleration, as described by Newton's Second Law, is the combined effect of two causes:

  • The net balance of all external forces acting onto that object — magnitude is directly proportional to this net resulting force;
  • That object's mass, depending on the materials out of which it is made — magnitude is inversely proportional to the object's mass.


Angle Convert

Angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. Angles formed by two rays lie in the plane that contains the rays. Angles are also formed by the intersection of two planes. These are called dihedral angles. Two intersecting curves define also an angle, which is the angle of the tangents at the intersection point. For example, the spherical angle formed by two great circles on a sphere equals the dihedral angle between the planes containing the great circles.

Angle is also used to designate the measure of an angle or of a rotation. This measure is the ratio of the length of a circular arc to its radius. In the case of a geometric angle, the arc is centered at the vertex and delimited by the sides. In the case of a rotation, the arc is centered at the center of the rotation and delimited by any other point and its image by the rotation.


Area Convert

Area is the quantity that expresses the extent of a two-dimensional region, shape, or planar lamina, in the plane. Surface area is its analog on the two-dimensional surface of a three-dimensional object. Area can be understood as the amount of material with a given thickness that would be necessary to fashion a model of the shape, or the amount of paint necessary to cover the surface with a single coat. It is the two-dimensional analog of the length of a curve (a one-dimensional concept) or the volume of a solid (a three-dimensional concept).


Area Density Convert

The area density of a two-dimensional object is calculated as the mass per unit area. The SI derived unit is: kilogram per square metre (kg·m−2). In the paper and fabric industries, it is called grammage and is expressed in grams per square meter (gsm); for paper in particular, it may be expressed as pounds per ream of standard sizes ("basis ream").


Chemical Amount Convert

In environmental chemistry, the chemical oxygen demand (COD) is an indicative measure of the amount of oxygen that can be consumed by reactions in a measured solution. It is commonly expressed in mass of oxygen consumed over volume of solution which in SI units is milligrams per litre (mg/L). A COD test can be used to easily quantify the amount of organics in water. The most common application of COD is in quantifying the amount of oxidizable pollutants found in surface water (e.g. lakes and rivers) or wastewater. COD is useful in terms of water quality by providing a metric to determine the effect an effluent will have on the receiving body, much like biochemical oxygen demand (BOD).


Data Storage Convert

Data Storage is a computer data storage architecture that manages data as objects, as opposed to other storage architectures like file systems which manages data as a file hierarchy, and block storage which manages data as blocks within sectors and tracks. Each object typically includes the data itself, a variable amount of metadata, and a globally unique identifier. Object storage can be implemented at multiple levels, including the device level (object-storage device), the system level, and the interface level. In each case, object storage seeks to enable capabilities not addressed by other storage architectures, like interfaces that are directly programmable by the application, a namespace that can span multiple instances of physical hardware, and data-management functions like data replication and data distribution at object-level granularity.


Data Transfer Rate Convert

In telecommunications, data-transfer rate is the average number of bits (bitrate), characters or symbols (baudrate), or data blocks per unit time passing through a communication link in a data-transmission system. Common data rate units are multiples of bits per second (bit/s) and bytes per second (B/s). For example, the data rates of modern residential high-speed Internet connections are commonly expressed in megabits per second (Mbit/s).


Density Convert

Density conversion is a free online calculator for converting metric and imperial units of density. Conversion between kilogram/cubic meter, gram/cubic centimeter, kilogram/liter, pound/cubic inch, gram/cubic centimeter


Electric Charge Convert

Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field. Electric charge can be positive or negative (commonly carried by protons and electrons respectively). Like charges repel each other and unlike charges attract each other. An object with an absence of net charge is referred to as neutral. Early knowledge of how charged substances interact is now called classical electrodynamics, and is still accurate for problems that do not require consideration of quantum effects.


Electric Current Convert

An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is measured as the net rate of flow of electric charge through a surface or into a control volume. The moving particles are called charge carriers, which may be one of several types of particles, depending on the conductor. In electric circuits the charge carriers are often electrons moving through a wire. In semiconductors they can be electrons or holes. In an electrolyte the charge carriers are ions, while in plasma, an ionized gas, they are ions and electrons.

The SI unit of electric current is the ampere, or amp, which is the flow of electric charge across a surface at the rate of one coulomb per second. The ampere (symbol: A) is an SI base unit: Electric current is measured using a device called an ammeter.

Electric currents create magnetic fields, which are used in motors, generators, inductors, and transformers. In ordinary conductors, they cause Joule heating, which creates light in incandescent light bulbs. Time-varying currents emit electromagnetic waves, which are used in telecommunications to broadcast information.


Electric Potential Convert

The electric potential (also called the electric field potential, potential drop, the electrostatic potential) is defined as the amount of work energy needed to move a unit of electric charge from a reference point to the specific point in an electric field. More precisely, it is the energy per unit charge for a test charge that is so small that the disturbance of the field under consideration is negligible. Furthermore, the motion across the field is supposed to proceed with negligible acceleration, so as to avoid the test charge acquiring kinetic energy or producing radiation. By definition, the electric potential at the reference point is zero units. Typically, the reference point is earth or a point at infinity, although any point can be used.


Energy Convert

Convert energy units, joules, calories, btu, erg, kwh, mwh

Energy is a measure of how long we can sustain the output of power, or how much work we can do. There are two kinds of energy: potential and kinetic.
Potential energy is waiting to be converted into power. Gasoline in a fuel tank as an example. Kinetic energy is energy a body possesses because it is in motion.

Work is the application of a force over a distance. Work is equal to the product of the force and the distance through which it produces movement.


Flow Convert

Flow measurement is the quantification of bulk fluid movement. Flow can be measured in a variety of ways. The common types of flowmeters with industrial applications are listed below:

  • a) Obstruction type (differential pressure or variable area)
  • b) Inferential (turbine type)
  • c) Electromagnetic
  • d) Positive-displacement flowmeters, which accumulate a fixed volume of fluid and then count the number of times the volume is filled to measure flow.
  • e) Fluid dynamic (vortex shedding)
  • f) Anemometer
  • g) Ultrasonic
  • h) Mass flowmeter (Coriolis force).

Flow measurement methods other than positive-displacement flowmeters rely on forces produced by the flowing stream as it overcomes a known constriction, to indirectly calculate flow. Flow may be measured by measuring the velocity of fluid over a known area. For very large flows, tracer methods may be used to deduce the flow rate from the change in concentration of a dye or radioisotope.


Force Convert

Convert force units, newton, kilonewton, dyne, pound force, kg force

Force is defined as the acting on a body causes that body to accelerate.

Force calculation formula is :

  • Force = mass (kg etc) * acceleration (meter per second squared etc)
  • Force unit in SI system is the Newton (N), which is equivalent to kg·m·s-2.
  • Other force units such as kilonewton, meganewton, pound force, kilogram force, dyne are widely used.

Frequency Convert

Frequency is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as temporal frequency to emphasize the contrast to spatial frequency, and ordinary frequency to emphasize the contrast to angular frequency. Frequency is measured in hertz (Hz) which is equal to one event per second. The period is the duration of time of one cycle in a repeating event, so the period is the reciprocal of the frequency.

 For example: if a newborn baby's heart beats at a frequency of 120 times a minute (2 hertz), its period, T—the time interval between beats—is half a second (60 seconds divided by 120 beats). Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio signals (sound), radio waves, and light.


Fuel Consumption Convert

Convert mpg (miles per gallon), liters per 100 kilometers (km) and more

Fuel consumption is the amount of fuel used for a unit of distance. Gallons, liters per 100 kilometers (liter/100 km), gallons per 100 miles are normally used in europe to compare fuel consumption. The lower the value, the car, the vehicle has better gas mileage.

Fuel economy, efficiency is the distance traveled per unit of fuel, gas. Kilometers per liter, miles per gallon (mpg), miles per liter, km per gallons are used in north america, uk, for gas economy. The higher the value, the car is more fuel efficient.


Illuminance Convert

Illuminance is the total luminous flux incident on a surface, per unit area. It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception. Similarly, luminous emittance is the luminous flux per unit area emitted from a surface. Luminous emittance is also known as luminous exitance.

In SI units illuminance is measured in lux (lx), or equivalently in lumens per square metre (lm·m−2). Luminous exitance is measured in lm·m−2 only, not lux. In the CGS system, the unit of illuminance is the phot, which is equal to 10000 lux. The foot-candle is a non-metric unit of illuminance that is used in photography.

Illuminance was formerly often called brightness, but this leads to confusion with other uses of the word, such as to mean luminance. "Brightness" should never be used for quantitative description, but only for nonquantitative references to physiological sensations and perceptions of light.


Length Convert

Convert metric and imperial length, distance units

Length (distance) is one dimensional measure between two end points.

There are many units used for length measurement. In metric system, basic unit of length is meter (m) and defined as speed of light. Other metric length units kilometer (km), centimeter (cm), millimeter (mm) are widely used.

In imperial system, common length units are foot, inch, yard and mile.


Luminance Convert

Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. It describes the amount of light that passes through, is emitted from, or is reflected from a particular area, and falls within a given solid angle.

Brightness is the term for the subjective impression of the objective luminance measurement standard (see Objectivity (science) § Objectivity in measurement for the importance of this contrast).

The SI unit for luminance is candela per square metre (cd/m2), as defined by the International System of Units (SI is from the French Système international d'unités) standard for the modern metric system. A non-SI term for the same unit is the nit. The unit in the Centimetre–gram–second system of units (CGS) (which predated the SI system) is the stilb, which is equal to one candela per square centimetre or 10 kcd/m2.


Luminous Intensity Convert

Luminous Intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye. The SI unit of luminous intensity is the candela (cd), an SI base unit.


Mass Flow Convert

In physics and engineering, mass flow rate is the mass of a substance which passes per unit of time. Its unit is kilogram per second in SI units, and slug per second or pound per second in US customary units. 


Power Convert

Convert power units, watts, kilowatt (kw), megawatt (mw), horsepower (hp)

Power is the rate at which work is performed or energy is transferred.

The units of power are units of energy divided by time.

Power calculation formula is :

  • Power = Work / Time
  • Power unit in SI system is watts (w). Other power units, kilowatts (kw), megawatts (mw), gigawatts (gw), horsepower (hp) are widely used.

Pressure Convert

Convert pascal (pa), kpa, mpa, torr (mmhg), psi, atm, bar, newton square meter

Pressure is defined as the force per unit area applied on a surface in a direction perpendicular to that surface.

To calculate the pressure formula is :

  • Pressure = Force / Area.
  • Pressure unit in SI system is pascal (pa). It is equivalent to one newton per square meter.
  • Other pressure units, kilopascal (kpa), megapascal (mpa), psi (pound per square inch), torr (mmHg), atm (atmospheric pressure), bar and pound per square foot are widely used.

Speed Convert

Convert speed units, meters per second, miles per hour, kilometers per hour

Speed is defined as the rate of change in position, expressed as distance traveled per unit of time. Speed is a scalar quantity with dimensions distance/time. Velocity is a vector quantity, the rate at which an object changes it's position.

In order to calculate speed, the formula is :

  • Speed = Distance / Time
  • Speed unit in SI system is meters per second (mps).
  • Other speed units such as miles per hour (mph), kilometers per hour (kph) are also widely used.

Temperature Convert

Convert celsius, fahrenheit, kelvin, reaumur, rankine

Temperature is a measure of how hot or cold something is which is the result of the motion of particles which make up the substance.

Temperature unit in SI system is Kelvin (K). Other temperature scales are degrees celsius, fahrenheit, reaumur, rankine.

Temperature conversion formulas for celsius and fahrenheit :

  • Fahrenheit = Celsius * 9 / 5 + 32
  • Celsius = (Fahrenheit - 32) * 5 / 9

Interesting Temperature facts

Event Fahrenheit Celsius Kelvin
When Water boils 212 100 373
When Alcohol boils 174 79 352
What is Normal body temperature 98 36 310
When Water freezes 32 0 273
When Nitrogen boils -320 -195 77
When Helium boils -452 -268 4
What is Absolute Zero -459 -273 0

Time Convert

Convert time units, hours, minutes, seconds, days, weeks, months

There are different calendars used worldwide but international standard is gregorian calendar.

Second is the SI base unit of time and officially defined as the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.

This time conversion calculator converts the most common time units, second, hour, minute, day, week, month, year, century and more.


Torque Convert

In physics and mechanics, torque is the rotational equivalent of linear force. It is also referred to as the moment, moment of force, rotational force or turning effect, depending on the field of study. The concept originated with the studies by Archimedes of the usage of levers. Just as a linear force is a push or a pull, a torque can be thought of as a twist to an object around a specific axis. Another definition of torque is the product of the magnitude of the force and the perpendicular distance of the line of action of a force from the axis of rotation. The symbol for torque is typically {\boldsymbol {\tau }}or τ , the lowercase Greek letter tau. When being referred to as moment of force, it is commonly denoted by M.


Volume Convert

Convert metric and imperial volume units

Volume is the amount of three dimensional space occupied by an object. It can be calculated by different formulas depending on the shape of the object.
In metric system, unit of volume is cubic meters. Liter is not a metric unit but widely used in metric system. The most common imperial volume units are gallon, quart, pint.

This conversion calculator converts the most common volume units.


Weight and Mass Convert

Use this mass and  weight converter to convert instantly between pounds, ounces, kilograms, grams, stones, tonnes and other metric and imperial weight units.