Universal Unit Converter

Unit Converter


Units of measurement are like the language of numbers. These units help us by providing an easy way to measure different things, from the length of a pencil to the weight of an elephant. In this article, we’ll learn some common units of measurement and how to convert between them. So, whether you’re curious about the length of your favourite bookshelf or your own height. The mysteries of measurement can be unlocked by understanding units.



Measure on the Basis of Basic Conversion Formulas of centimeter, inch, foot, meter, kilometer.

History and Systems

Ancient Systems

Early civilizations, such as the Egyptians and Babylonians, used body parts like the Foot or hand spans as basic units of length. Ancient Egyptians were known to use a system of cubits, where one cubit was roughly equal to the length from a person’s elbow to their fingertips. The Babylonians were among the first to develop a system of weights and measures. They used a base-60 numbering system.

Greek and Roman Systems

Ancient Greeks introduced their own measurement system, including the stadion (a unit of length) and the talent (a unit of weight). The Roman Empire adopted various units, such as the Foot (pes) and the mile (mille passus), which influenced the development of modern units.

Metric System

The metric system is also known as the International System of Units (SI). In 1795, the French Academy of Sciences introduced the metric system, which included units like the Meter, kilogram, and second. These units were defined based on natural constants. The metric system was adopted by many countries over time. It has become the standard system for science and industry worldwide.

Imperial System

In the United Kingdom and later in the United States, the imperial system of measurements developed independently. Units like the Inch, Foot, pound, and gallon are part of the imperial system.


With the growth of international trade and science, there was a need for standardized units. In 1875, The Treaty of the Meter established the International Bureau of Weights and Measures (BIPM) and led to the creation of the International System of Units (SI).

Modern Units

The SI system, based on fundamental constants of nature, is the most widely used system today. It includes units like the Meter (length), kilogram (mass), second (time), and others.

Evolution of Definitions:

Over time, the definitions of some units have evolved as our understanding of the physical world has improved. For example, the Meter was initially defined based on a prototype, but it is now defined using the speed of light.

Global Adoption:

The SI system is now used globally in science, engineering, and commerce. Efforts are ongoing to redefine some units further based on fundamental constants for greater precision and universality. The history of units of measurement reflects humanity’s quest for precision and standardization, and it continues to evolve as science and technology advance.

Unit Conversions:

Here are some common conversions of units used worldwide.

Centimeter (cm) to InchInch (in):

  • 1 cm = 0.393701 in
  • To convert from cm to in, multiply the length in cm by 0.393701.

Inch (in) to Centimeter (cm):

  • 1 in = 2.54 cm
  • To convert from into cm, multiply the length in inches by 2.54.

Kilometer (km) to Meter (m):

  • 1 km = 1000 m
  • To convert from km to m, multiply the length in kilometers by 1000.

Meter (m) to Kilometer (km):

  • 1 m = 0.001 km
  • To convert from m to km, multiply the length in meters by 0.001.

Foot (ft) to Meter (m):

  • 1 ft = 0.3048 m
  • To convert from ft to m, multiply the length in feet by 0.3048.

Meter (m) to Foot (ft):

  • 1 m = 3.28084 ft
  • To convert from m to ft, multiply the length in meters by 3.28084.

You can use these conversion factors to convert lengths between centimeters, inches, kilometers, meters, and feet as needed.

Units Division:

Millimeter (mm):

  • 1 mm = 0.1 centimeters (cm)
  • 1 mm = 0.03937 inches (in)
  • 1 mm = 0.000001 kilometers (km)
  • 1 mm = 0.001 meters (m)
  • 1 mm = 0.0032808 feet (ft)

Centimeter (cm):

  • 1 cm = 10 mm
  • 1 cm = 0.393701 inches (in)
  • 1 cm = 0.00001 kilometers (km)
  • 1 cm = 0.01 meters (m)
  • 1 cm = 0.0328084 feet (ft)

Inch (in):

  • 1 in = 25.4 millimeter (mm)
  • 1 in = 2.54 centimeter (cm)
  • 1 in = 0.0000254 kilometer (km)
  • 1 in = 0.0254 meter (m)
  • 1 in = 0.0833333 foot (ft)

Kilometer (km):

  • 1 km = 1,000,000 millimeters (mm)
  • 1 km = 100,000 centimeters (cm)
  • 1 km = 39,370.1 inches (in)
  • 1 km = 1000 meters (m)
  • 1 km = 3280.84 feet (ft)

Foot (ft):

  • 1 ft = 304.8 millimeters (mm)
  • 1 ft = 30.48 centimeters (cm)
  • 1 ft = 12 inches (in)
  • 1 ft = 0.0003048 kilometers (km)
  • 1 ft = 0.3048 meters (m)

Meter (m):

  • 1 m = 1000 millimeters (mm)
  • 1 m = 100 centimeters (cm)
  • 1 m = 39.3701 inches (in)
  • 1 m = 0.001 kilometers (km)
  • 1 m = 3.28084 feet (ft)