Calculator
What the Current Converter does
Current Converter: 1 A = 1000 mA, so multiply a ampere value by 1000 to get milliampere, or divide to go back. Example: 1 A = 1000 mA.
Result, How it was calculated and Reverse conversion, derived from Value, From and To. Each change is reflected immediately, which suits quick what-if comparisons.
Having the exact factor matters more than a rough mental estimate. The Current Converter exists to take that particular chore off your hands.
No sign-up, no data collection, no processing queue, just code running locally.
If you want to check the arithmetic, the field table, the method and a worked example are further down.
What do the Current Converter fields mean?
The Current Converter uses 3 inputs. Every box starts with a working value, so there is a real result on screen before you touch anything.
| Field | What to enter | Default |
|---|---|---|
| Value | required | 1 |
| From | choose from Microampere (µA), Milliampere (mA), Ampere (A) or Kiloampere (kA) | Ampere (A) |
| To | choose from Microampere (µA), Milliampere (mA), Ampere (A) or Kiloampere (kA) | Milliampere (mA) |
How does the Current Converter work?
Both units are converted through electric current's base unit (A), so any of the 4 units in the dropdowns can be paired in either direction without loss of accuracy.
Factors follow the internationally agreed definitions. The inch has been exactly 25.4 mm since 1959, and an exact definition is used wherever one exists. Where a unit is fixed by measurement rather than by agreement, the accepted CODATA or IAU value is used.
Worked example
These are the values the Current Converter loads by default, and the result it produces from them. The figures are the tool’s live defaults and its live output, so you can reproduce them exactly.
| Value | 1 |
|---|---|
| From | Ampere (A) |
| To | Milliampere (mA) |
| Result | 1000 mA |
|---|---|
| How it was calculated | 1 A = 1000 mA, so 1 × 1000 = 1000 mA |
| Reverse conversion | 0.001 A (if you meant 1 mA) |
Electric current: amperes
The ampere (A), the SI base unit of electric current, measures the flow of electric charge, and unlike most of the length/mass/volume units on this site, the units built from it (milliampere, microampere) are pure decimal steps with no imperial or historical-oddity baggage to untangle.
Worth knowing
- Household circuit breakers are commonly rated at 15 to 20 amps in the US or 13 to 32 amps for typical UK/EU circuits, protecting wiring from overheating if too much current flows through it at once.
- Small electronics draw current in the milliampere range. An LED might use 10 to 20 mA, while a smartphone fast-charging can draw several amps briefly.
- Current alone doesn’t determine how dangerous or powerful a circuit is, that also depends on voltage (their product gives power in watts), which is why current, voltage and power are three separate, related conversions on this site rather than one.
Definitions: BIPM SI Brochure · NIST reference on units
How to use it
- Fill in Value.
- Pick a value for From: the options are Microampere (µA), Milliampere (mA), Ampere (A) or Kiloampere (kA).
- Pick a value for To: the options are Microampere (µA), Milliampere (mA), Ampere (A) or Kiloampere (kA).
- Live output means you can search for a target value by nudging an input up and down.
- The panel reports Result, How it was calculated and Reverse conversion.
- The link encodes your inputs, so saving it is enough to reproduce the result later.
What this tool does not do
- Repeated conversions compound rounding, so convert once from the original value where possible.
- Factors use the internationally agreed definitions; some industries round them differently.
- It assumes the values you give are already consistent with each other.
- The tool cannot tell whether a number was entered in the unit you intended, so double-check the labels.
Frequently asked questions
Only Value, From and To. Defaults are loaded for all of them, letting you treat it as a what-if tool rather than a data-entry form.
With the values loaded when the page opens, result comes out as 1000 mA. That number tracks the inputs, so a small edit shows its sensitivity immediately.
No. The work runs in JavaScript inside this page, so your values never leave your device. You can confirm it in your browser network tab.
Free, and there is no upsell. The whole tool is the free version.
It matches what you would get working it out by hand, with fewer opportunities to slip.