About

Electrical engineers, PCB designers, and hobbyists often face the challenge of reconciling datasheet values with measured currents. Components like microcontrollers often list consumption in milliamperes, while power supplies display output in Amperes. Misinterpretation of these orders of magnitude leads to blown fuses, overheated traces, or failed compliance tests. This tool bridges that gap by providing a precise conversion mechanism based on the SI definition of current units.

Accuracy is non-negotiable in electronics. A decimal point shift results in a thousand-fold error, potentially destroying sensitive hardware like standard LEDs or ICs. This converter eliminates manual arithmetic risks, ensuring your load calculations and battery life estimations remain strictly accurate.

Formulas

The conversion between Amperes and Milliamperes relies on the metric prefix "milli", which represents a factor of 11000.

To convert from Amperes to Milliamperes:

I_(mA) = I_(A) × 1000

To convert from Milliamperes to Amperes:

I_(A) = I_(mA)1000

Where I represents the electric current intensity.

Reference Data

Current (A)	Current (mA)	Typical Application
0.001 A	1 mA	LED Standby Current
0.02 A	20 mA	Standard LED Forward Current
0.1 A	100 mA	Small DC Motor (No Load)
0.5 A	500 mA	USB 2.0 Max Output
1.0 A	1000 mA	Smartphone Charger (Standard)
2.0 A	2000 mA	Tablet Charger / Raspberry Pi
5.0 A	5000 mA	Laptop Power Brick
10.0 A	10000 mA	Automotive Fuse (Accessories)
15.0 A	15000 mA	Standard Household Circuit (US)

Frequently Asked Questions

Datasheets for low-power components (sensors, ICs, LEDs) typically specify current in milliamperes (mA), while power supply units and batteries often rate capacity or max output in Amperes (A) or Amp-hours (Ah). Converting to a unified unit is critical for calculating total power budget and selecting appropriate trace widths.

Yes. Electronics often involve very small currents (leakage currents) or very large ones. You can input values like "1.5e-3" for micro-scale calculations, and the tool will process the conversion accurately.

One Ampere is defined as the flow of one Coulomb of charge per second. One Milliampere is exactly one-thousandth of an Ampere. Therefore, 1 A contains 1000 mA.

Yes. The unit conversion factor (1000) applies regardless of whether the current is Alternating (AC) or Direct (DC). However, ensure you are comparing RMS values to RMS values, or Peak to Peak, to maintain physical consistency.