How many ma in an amp

Please provide values below to convert milliampere [mA] to ampere [A], or vice versa.

Milliampere

Definition: A milliampere (symbol: mA) is a submultiple of the SI base unit of electrical current, the ampere. It is defined as one thousandth of an ampere.

History/origin: The milliampere has its origins in the ampere. The prefix "milli" indicates one thousandth of the base unit it precedes, in this case the ampere. The ampere can be preceded by any of the metric prefixes in order to report units in the desired magnitude.

Current use: As a submultiple of an SI unit, the milliampere is used worldwide, often for smaller measurements of electrical current. There are many devices that measure units in terms of milliamperes such as galvanometers and ammeters, though these devices do not exclusively measure milliamperes.

Ampere

Definition: The ampere (symbol: A), often referred to as simply amp, is the base unit of electric current in the International System of Units (SI). The ampere is defined formally based on a fixed value for the elementary charge, e, of 1.602176634 × 10-19 when expressed in the unit C, which is equal to A·s. The second is defined based on the cesium frequency, ΔνCs. This definition is effective since 2019, and is a significant change from the previous definition of the ampere.

History/origin: The ampere is named after Andre-Marie Ampere, a French mathematician and physicist. In the centimeter-gram-second system of units, the ampere was defined as one tenth of the unit of electrical current of the time, which is now known as the abampere. The size of the unit was chosen such that it would fit conveniently within the metre-kilogram-second system of units. Before 2019, the ampere was defined formally as the constant current at which a force of 2 × 10-7 newtons per meter length would be produced between two conductors, where the conductors are parallel, have infinite length, are placed in a vacuum, and have negligible circular cross-sections. In terms of the SI unit of charge, the coulomb, one ampere is defined as one coulomb of charge passing through a given point in one second. This definition was difficult to realize with high precision, and as such was changed to be more intuitive, and easier to realize. Previously, since the definition included a reference to force, the SI kg, meter, and second needed to be defined before the ampere could be defined. Now, it is only dependent on the definition of the second. One potential drawback of the redefinition is that vacuum permeability, vacuum permittivity, and impedance of free space were exact before the redefinition, but will now be subject to experimental error.

Current use: As the SI base unit of electric current, the ampere is used worldwide for almost all applications involving electric current. An ampere can be expressed in the form of watts/volts, or W/V, such that an ampere equals 1 W/V, since power is defined as a product of current and voltage.

Milliampere to Ampere Conversion Table

How to Convert Milliampere to Ampere

1 mA = 0.001 A
1 A = 1000 mA

Example: convert 15 mA to A:
15 mA = 15 × 0.001 A = 0.015 A

Popular Current Unit Conversions

Convert Milliampere to Other Current Units

Use our interactive calculator to easily convert amps to milliamps (A to mA).

Amps to Milliamps Conversion Calculator

Amps (A)

Error: Enter a valid number of amps (A).

milliamps (mA)

Conversion formula: mA = A × 1000

Or would you rather convert milliamps to amps?

Amps to Milliamps Conversion Chart

Here is a conversion chart converting common values of amps to milliamps.

Note: Don't see the values you're looking for in this chart? Use our amps to milliamps conversion calculator at the top of this page to calculate them for your specific scenario.

How to Convert Amps to Milliamps (A to mA)

There are 1000 milliamps in 1 amp, just like how there are 1000 millimeters in 1 meter.

So, to convert amps to milliamps, just multiply amps times 1000.

Conversion formula: milliamps = amps × 1000

Abbreviated: mA = A × 1000

Example

A while back I made my own solar phone charger and used a USB power meter to measure its output. When I did, I got a result of 0.46 amps.

Here's how to convert this number to milliamps:

0.46 A × 1000 = 460 mA

So, in this example, my solar charger was outputting a current of 460 milliamps.

Easy!

How to Convert Milliamps to Amps (mA to A)

Need to convert the other way?

To convert milliamps to amps, divide amps by 1000.

Conversion formula: amps = milliamps ÷ 1000

Abbreviated: A = mA ÷ 1000

Example

Let's say you use have some LED string lights. You look at the label on the lights and see that they consume 100 milliamps.

Here's how to convert this number to amps:

100 mA ÷ 1000 = 0.1 A

So, in this example, your lights consume 0.1 amps of current when on.

What Is an Amp?

The ampere -- often shortened to amp -- is the SI base unit of electrical current. Electrical current is a count of the number of charged particles flowing through a conductor.

Ampere is abbreviated A. So, 1 ampere can be written as 1 A.

What Is a Milliamp?

A milliampere -- often shortened to milliamp -- is a submultiple of the ampere equivalent to one thousandth of an ampere (10-3 A or 0.001 A).

Milliampere is abbreviated mA. So, 1 milliampere can be written as 1 mA.

More Electricity Calculators

• Convert Amp Hours to Watt Hours
• Watts to Amps Conversion Calculator

How many mA are in a amp?

Is 1000 mA the same as 1 amp?

How many mA is 2 amps?

How do you convert mA to amps?