The ampere is a unit used to measure electric current. Use one of the conversion calculators below to convert to another unit of measure, or read on to learn more about amperes.
Ampere Conversion Calculators
Choose a unit of electric current to convert to.
Ampere Definition and Usage
The ampere was previously defined as a constant current that when passed through two straight and parallel conductors that are spaced one meter apart, will produce a force equal to 0.0000002 newtons per meter of length.
In 2019, the ampere was redefined as the electric current corresponding to the flow of 1/(1.602 176 634 × 10-19) elementary charges per second.
The ampere is the SI base unit for electric current in the metric system. An ampere is sometimes also referred to as an amp. Amperes can be abbreviated as A; for example, 1 ampere can be written as 1 A.
Ohm's Law states the current between two points on a conductor is proportional to the voltage and inversely proportional to the resistance. Using Ohm's Law, it's possible to express the current in amperes as an expression using resistance and voltage.
IA = VVRΩ
Background and Origin
The ampere is named for French physicist André-Marie Ampère to credit his work in electromagnetism and electrodynamics. The ampere was originally defined as one-tenth of an abampere, but has been redefined several times since.
Amperes Measurement Conversion Table
|amperes||milliamperes||kiloamperes||megaamperes||biots||abamperes||statamperes||coulombs per second|
|1 A||1,000 mA||0.001 kA||0.000001 MA||0.1 Bi||0.1 abA||299,792,454 statA||1 C/s|
|2 A||2,000 mA||0.002 kA||0.000002 MA||0.2 Bi||0.2 abA||599,584,907 statA||2 C/s|
|3 A||3,000 mA||0.003 kA||0.000003 MA||0.3 Bi||0.3 abA||899,377,361 statA||3 C/s|
|4 A||4,000 mA||0.004 kA||0.000004 MA||0.4 Bi||0.4 abA||1,199,169,815 statA||4 C/s|
|5 A||5,000 mA||0.005 kA||0.000005 MA||0.5 Bi||0.5 abA||1,498,962,268 statA||5 C/s|
|6 A||6,000 mA||0.006 kA||0.000006 MA||0.6 Bi||0.6 abA||1,798,754,722 statA||6 C/s|
|7 A||7,000 mA||0.007 kA||0.000007 MA||0.7 Bi||0.7 abA||2,098,547,176 statA||7 C/s|
|8 A||8,000 mA||0.008 kA||0.000008 MA||0.8 Bi||0.8 abA||2,398,339,629 statA||8 C/s|
|9 A||9,000 mA||0.009 kA||0.000009 MA||0.9 Bi||0.9 abA||2,698,132,083 statA||9 C/s|
|10 A||10,000 mA||0.01 kA||0.00001 MA||1 Bi||1 abA||2,997,924,537 statA||10 C/s|
|11 A||11,000 mA||0.011 kA||0.000011 MA||1.1 Bi||1.1 abA||3,297,716,991 statA||11 C/s|
|12 A||12,000 mA||0.012 kA||0.000012 MA||1.2 Bi||1.2 abA||3,597,509,444 statA||12 C/s|
|13 A||13,000 mA||0.013 kA||0.000013 MA||1.3 Bi||1.3 abA||3,897,301,898 statA||13 C/s|
|14 A||14,000 mA||0.014 kA||0.000014 MA||1.4 Bi||1.4 abA||4,197,094,352 statA||14 C/s|
|15 A||15,000 mA||0.015 kA||0.000015 MA||1.5 Bi||1.5 abA||4,496,886,805 statA||15 C/s|
|16 A||16,000 mA||0.016 kA||0.000016 MA||1.6 Bi||1.6 abA||4,796,679,259 statA||16 C/s|
|17 A||17,000 mA||0.017 kA||0.000017 MA||1.7 Bi||1.7 abA||5,096,471,713 statA||17 C/s|
|18 A||18,000 mA||0.018 kA||0.000018 MA||1.8 Bi||1.8 abA||5,396,264,166 statA||18 C/s|
|19 A||19,000 mA||0.019 kA||0.000019 MA||1.9 Bi||1.9 abA||5,696,056,620 statA||19 C/s|
|20 A||20,000 mA||0.02 kA||0.00002 MA||2 Bi||2 abA||5,995,849,074 statA||20 C/s|
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- International Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019, https://www.bipm.org/utils/common/pdf/si-brochure/SI-Brochure-9.pdf