Current / A → mA
Convert Amperes to Milliamperes
Convert electric current in amperes and metric multiples. Convert Amperes (A) to Milliamperes (mA). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Milliamperes to Amperes →
How to convert amperes to milliamperes
One ampere is one coulomb per second. Converting units does not change RMS, peak, or average current conventions; compare measurements made on the same basis.
Use x for the value in A, b for the intermediate value in A, and y for the result in mA.
mA = A ÷ 0.001
Worked examples
10 A ≈ 10000 mA
Step 1: (10 × 1) ≈ 10 A.
Step 2: 10 ÷ 0.001 ≈ 10000 mA.20 A ≈ 20000 mA
Step 1: (20 × 1) ≈ 20 A.
Step 2: 20 ÷ 0.001 ≈ 20000 mA.
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Amperes
Amperes (A) measures current under the conventions above. The base value in A is (x × 1), where x is the numerical value in A. Factors shown here are rounded for display; calculations use the stored factor.
About Milliamperes
Milliamperes (mA) measures current under the conventions above. The base value in A is (x × 0.001), where x is the numerical value in mA. Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Amperes to milliamperes reference table
| Amperes (A) | Milliamperes (mA) |
|---|---|
| 1 | 1000 |
| 5 | 5000 |
| 10 | 10000 |
| 25 | 25000 |
| 50 | 50000 |
| 100 | 100000 |
| 1000 | 1000000 |
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