Length
Convert between measurement systems
Convert scientific, metric, and imperial units in real time.
Measurement units are fundamental in science, engineering, commerce, and everyday life. They standardize the way we quantify and compare everything from lengths and weights to volumes and data sizes.
International System of Units (SI)
International System of Units (SI)
The International System of Units (SI), or Metric System, is the most widely adopted measurement system globally. It’s used by scientists and many countries for consistency and ease of communication across international borders. The SI is based on a decimal system and includes seven base units:
- Meter (m) – for length
- Kilogram (kg) – for mass
- Second (s) – for time
- Ampere (A) – for electric current
- Kelvin (K) – for temperature
- Mole (mol) – for amount of substance
- Candela (cd) – for luminous intensity
These units can be modified by adding prefixes to represent different scales (e.g., milli-, centi-, kilo-, mega-), making them versatile for measuring everything from microscopic distances to astronomical ones.
The International System is a standard established and revised by BIPM (Bureau International des Poids et Mesures -International Bureau of Weights and Measures).
Imperial Units
Imperial System
The Imperial System is primarily used in the United States and a few other countries. It includes units such as:
- Inches, Feet, and Yards – for length
- Pounds and Ounces – for weight
- Gallons and Pints – for volume
Unlike the SI, the Imperial System does not follow a base-10 structure, which can make conversions challenging. However, it remains widely used in certain applications, particularly in construction and industry in the U.S.
Scales prefixes
Scales and Prefixes
Scales and prefixes allow measurements to be represented in manageable quantities, regardless of their magnitude. Here are some standard prefixes:
| Prefix | Symbol | Factor | 10^ | Scale |
|---|---|---|---|---|
| Yotta | Y | 1,000,000,000,000,000,000,000 | 1024 | Septillion |
| Zetta | Z | 1,000,000,000,000,000,000 | 1021 | Sextillion |
| Exa | E | 1,000,000,000,000,000 | 1018 | Quintillion |
| Peta | P | 1,000,000,000,000 | 1015 | Quadrillion |
| Tera | T | 1,000,000,000,000 | 1012 | Trillion |
| Giga | G | 1,000,000,000 | 109 | Billion |
| Mega | M | 1,000,000 | 106 | Million |
| Kilo | k | 1,000 | 103 | Thousand |
| Hecto | h | 100 | 102 | Hundred |
| Deca | da | 10 | 101 | Ten |
| Base Unit | – | 1 | 100 | One |
| Deci | d | 0.1 | 10-1 | Tenth |
| Centi | c | 0.01 | 10-2 | Hundredth |
| Milli | m | 0.001 | 10-3 | Thousandth |
| Micro | µ | 0.000001 | 10-6 | Millionth |
| Nano | n | 0.000000001 | 10-9 | Billionth |
| Pico | p | 0.000000000001 | 10-12 | Trillionth |
| Femto | f | 0.000000000000001 | 10-15 | Quadrillionth |
| Atto | a | 0.000000000000000001 | 10-18 | Quintillionth |
| Zepto | z | 0.000000000000000000001 | 10-21 | Sextillionth |
| Yocto | y | 0.000000000000000000000001 | 10-24 | Septillionth |
