Amperes (A)	Milliamperes (mA)
1 A	1000 mA
2 A	2000 mA
5 A	5000 mA
10 A	10000 mA
25 A	25000 mA
50 A	50000 mA
100 A	100000 mA
250 A	250000 mA
500 A	500000 mA
1000 A	1000000 mA

Convert Amperes to Milliamperes

Convert amperes to milliamperes (A to mA) with our instant calculator. 1 A = 1000 mA. Includes exact formula and reference tables.

How to Convert Amperes to Milliamperes (A to mA)

1 Ampere (A) is equal to 1000 Milliamperes (mA). Multiply the ampere value by 1000

Quick Answer 1 A = 1000 mA

Formula mA = A × 1000

Inverse Factor 1 mA = 0.001 A

Unit Definitions & Metrology Context

The standard SI base unit of electric current is the ampere (A), defined by taking the fixed numerical value of the elementary charge e to be 1.602176634 × 10⁻¹⁹ coulombs per second.

About Amperes (A): Ampere (A) is a unit in the Electric Current measurement category. It is widely used in base si unit of electric current (1 c/s). The ampere (A) serves as the primary reference base unit for the electric current domain.

About Milliamperes (mA): Milliampere (mA) is a unit in the Electric Current measurement category. It is widely used in electronics & microcontroller circuits. Relative to the electric current base unit, 1 mA equals 0.001 Amperes (A).

Need to convert in the opposite direction? Visit our Convert Milliamperes to Amperes (mA to A) calculator (1 mA = 0.001 A).

Step-by-Step Worked Examples (A to mA)

Convert 5 Amperes to Milliamperes: Applying the formula (mA = A × 1000): starting with 5 A, multiply the ampere value by 1000 to get 5000 mA.
Convert 10 Amperes to Milliamperes: Applying the formula (mA = A × 1000): starting with 10 A, multiply the ampere value by 1000 to get 10000 mA.
Convert 50 Amperes to Milliamperes: Applying the formula (mA = A × 1000): starting with 50 A, multiply the ampere value by 1000 to get 50000 mA.

Popular Electric Current Conversions

Ampere ⇄ Milliampere

1 ampere (A) equals exactly 1,000 milliamperes (mA).

Milliampere ⇄ Ampere

Divide milliamperes by 1,000 to convert to amperes (500 mA = 0.5 A).

Milliampere-hour ⇄ Ampere-hour

Divide milliampere-hours by 1,000 to convert battery capacity to ampere-hours (5,000 mAh = 5 Ah).

Ampere-hour ⇄ Milliampere-hour

Multiply ampere-hours by 1,000 to get battery capacity in milliampere-hours (mAh).

Microampere ⇄ Milliampere

1 milliampere contains 1,000 microamperes (µA).

Frequently Asked Questions

Verified answers and formulas for converting amperes to milliamperes.

How many milliamperes are in 1 ampere?

There are 1000 milliamperes (mA) in 1 ampere (A). Conversely, 1 milliampere equals 0.001 amperes.

How do you convert amperes to milliamperes?

To convert amperes (A) to milliamperes (mA), use the formula: mA = A × 1000. Multiply the ampere value by 1000. For example, 10 A equals 10000 mA.

How do I convert back from milliamperes to amperes?

To convert in the reverse direction from milliamperes (mA) to amperes (A), use the inverse formula: A = mA / 1000. Divide the milliampere value by 1000 (1 mA = 0.001 A).

What is the difference between ampere (A) and milliampere (mA)?

Both ampere and milliampere measure electric current. Ampere (A) is a unit in the Electric Current measurement category. It is widely used in base si unit of electric current (1 c/s). The ampere (A) serves as the primary reference base unit for the electric current domain. Milliampere (mA) is a unit in the Electric Current measurement category. It is widely used in electronics & microcontroller circuits. Relative to the electric current base unit, 1 mA equals 0.001 Amperes (A).

How do you convert mAh (milliampere-hours) to Ah (ampere-hours)?

To convert mAh to Ah, divide the mAh rating by 1,000. For example, a 5,000 mAh smartphone battery or power bank has a capacity of 5 Ah (5,000 ÷ 1,000 = 5 Ah).