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Electric Current Converter - Convert Amps (A), Milliamps (mA), Kiloamps (kA) & More Free Online

Free online electric current converter tool to instantly convert between amperes (A), milliamperes (mA), microamperes (μA), nanoamperes (nA), picoamperes (pA), kiloamperes (kA), megaamperes (MA), gigaamperes (GA), statamperes (statA) and abamperes (abA). Ideal for electrical engineers, electricians, physics students, and electronics hobbyists. Accurate to six decimal places with real-time conversion.

Input Current

Converted Current

Converted value will appear here

What Is an Electric Current Converter?

An electric current converter (also called an amps converter, current unit calculator or amperage conversion tool) is an online application that instantly translates a measurement of electric current from one unit to another. Electric current, measured in amperes (A), is the flow of electric charge through a conductor and is one of the seven fundamental SI base quantities. Because electrical systems operate across vastly different scales - from picoamperes in sensitive biomedical sensors to kiloamperes in industrial machinery - engineers, technicians, students and hobbyists constantly need to move between units like milliamperes (mA), microamperes (μA), nanoamperes (nA), kiloamperes (kA) and megaamperes (MA).

Our free online electric current conversion calculator handles all these conversions automatically. It uses the exact SI definition of the ampere (the base unit) and standard decimal prefixes to deliver results accurate to six decimal places. In addition to the metric/SI units, the tool also covers CGS electromagnetic units like statamperes (statA) and abamperes (abA), which are still used in some physics contexts and legacy literature.

Whether you need to convert mA to A, convert amps to milliamps, convert μA to mA, or perform more specialised conversions like abamperes to amperes, this tool gives you the answer instantly - no sign‑up, no software installation and completely free.

How to Use the Electric Current Converter - Step‑by‑Step Guide

Using our online current converter is extremely simple. Just follow these steps:

  1. Enter the current value in the left input field. You can type integers or decimals (e.g., 1500, 0.05 or 2.3e-4). The field accepts up to 20 characters and supports very large or very small numbers typical of electrical engineering calculations.
  2. Select the source unit from the “From Unit” dropdown. The list includes amperes (A), milliamperes (mA), microamperes (μA), nanoamperes (nA), picoamperes (pA), kiloamperes (kA), megaamperes (MA), gigaamperes (GA), statamperes (statA) and abamperes (abA).
  3. Select the target unit from the “To Unit” dropdown on the right panel. This is the unit you want to convert into.
  4. The conversion happens automatically as you type or change the units - no need to press a button (though a “Convert” button is also available for manual triggering). The result appears instantly in the output panel, showing both the numeric value and a full conversion statement (e.g., “1500 mA = 1.5 A”).
  5. Copy the result with the dedicated copy button, or use the “Swap Units” button to instantly reverse the direction of conversion.
  6. Use Fullscreen mode (the expand icon) for a focused view, perfect for presentations or when working on a single conversion.
  7. Click “Clear” to reset all fields and start fresh.

Your last used values are automatically saved in your browser for up to 30 days, so you can continue your work later without losing your place.

Understanding All Electric Current Units in Depth

Ampere (A) - The SI Base Unit

The ampere (often shortened to “amp”) is the base unit of electric current in the International System of Units (SI). It is defined by taking the fixed numerical value of the elementary charge e to be 1.602176634×10−19 when expressed in the unit C (coulomb), which equals A·s. In simpler terms, one ampere corresponds to the flow of one coulomb of electric charge per second. All other current units in this converter are multiples or submultiples of the ampere, or related through defined conversion factors.

The ampere is the most important unit in electrical engineering, circuit design and power distribution. Typical household circuits in many countries are rated at 15 A or 20 A; an LED might draw 0.02 A (20 mA), while an industrial motor may draw 50 A or more.

Metric Submultiples - mA, μA, nA, pA

For smaller currents, engineers use metric prefixes. The most common are:

  • Milliampere (mA) - 1 mA = 0.001 A (10−3 A). Used extensively in electronics, LED circuits, and battery specifications.
  • Microampere (μA) - 1 μA = 0.000001 A (10−6 A). Typical for low‑power microcontrollers, sensor outputs, and biomedical devices.
  • Nanoampere (nA) - 1 nA = 10−9 A. Important in precision analog circuits, photodiodes, and semiconductor leakage measurements.
  • Picoampere (pA) - 1 pA = 10−12 A. Used in ultra‑sensitive instrumentation, electrochemistry, and particle physics detectors.

Metric Multiples - kA, MA, GA

For large currents, the following prefixes are used:

  • Kiloampere (kA) - 1 kA = 1,000 A. Common in power distribution (switchgear, substations), welding machines, and some industrial processes.
  • Megaampere (MA) - 1 MA = 1,000,000 A. Used in pulsed‑power applications, fusion research, and ultra‑high‑current experiments.
  • Gigaampere (GA) - 1 GA = 109 A. Extremely specialised; appears in some astrophysical contexts (lightning‑like events in space) and theoretical electromagnetics.

CGS Electromagnetic Units - statA and abA

The centimetre‑gram‑second (CGS) system is still encountered in physics literature. Two CGS current units are supported:

  • Statampere (statA) - Also called the esu of current. One statA ≈ 3.335641×10−10 A. It arises from the electrostatic CGS system and is often used in theoretical electromagnetism.
  • Abampere (abA) - Also called the biot. One abA = 10 A exactly. It belongs to the electromagnetic CGS system and is occasionally found in older engineering references.

Electric Current Unit Conversion Table (Reference)

The table below lists all supported units, their symbols and the exact factor to convert to the base unit ampere (A). Use this as a quick reference when working with current conversions.

UnitSymbolEquivalent in Amperes (A)Typical Application
AmpereA1SI base unit - all electrical systems
MilliamperemA0.001LEDs, small circuits, batteries
MicroampereμA0.000001Microcontrollers, sensors, low‑power devices
NanoamperenA1×10-9Precision analog ICs, photodiodes
PicoamperepA1×10-12Electrometers, particle detectors
KiloamperekA1,000Power distribution, industrial heating
MegaampereMA1,000,000Pulsed power, fusion experiments
GigaampereGA1×109Astrophysical phenomena, extreme lab setups
StatamperestatA3.335641×10-10CGS electrostatic system
AbampereabA10CGS electromagnetic system

To convert between any two units, you can always multiply by the factor of the source unit to get amperes, then divide by the factor of the target unit. Our electric current converter does this automatically.

Common Electric Current Conversions & Real‑World Examples

Everyday Conversions

  • • 1 A = 1,000 mA (convert amps to milliamps)
  • • 1 mA = 0.001 A (convert milliamps to amps)
  • • 500 mA = 0.5 A
  • • 0.75 A = 750 mA
  • • 2.5 A = 2,500 mA
  • • 0.1 A = 100 mA
  • • 10 mA = 10,000 μA
  • • 100 μA = 0.0001 A

Industrial & Scientific Conversions

  • • 1 kA = 1,000 A
  • • 3.2 kA = 3,200 A (arc furnace)
  • • 0.5 MA = 500,000 A (lightning stroke)
  • • 50 μA = 0.05 mA (sensor output)
  • • 1 nA = 1×10-9 A
  • • 100 pA = 1×10-10 A
  • • 1 abA = 10 A (legacy CGS unit)
  • • 3×109 statA ≈ 1 A

Key Conversion Formulas

  • • Amps → Milliamps: × 1,000
  • • Milliamps → Amps: ÷ 1,000
  • • Amps → Microamps: × 1,000,000
  • • Microamps → Amps: ÷ 1,000,000
  • • Kiloamps → Amps: × 1,000
  • • Megaamps → Amps: × 1,000,000
  • • statA → A: × 3.335641×10-10
  • • abA → A: × 10

Typical Device Current Draw

  • • Smartphone charging: ~1–2 A
  • • LED indicator: 10–20 mA
  • • Electric kettle: 8–13 A (230 V countries)
  • • Industrial motor: 20–200 A (or more)
  • • Car starter motor: 100–300 A (12 V)
  • • High‑voltage transmission line: hundreds of A

Who Uses an Electric Current Converter & Why?

An electric current conversion calculator is an essential tool across many disciplines. Here are some of the typical users:

Electrical Engineers

During circuit design, power system analysis, and component specification, engineers routinely switch between amps, milliamps and microamps. Accurate unit conversion avoids costly design mistakes.

Electricians & Technicians

Reading equipment nameplates, multimeters and clamp meters often requires conversion between large and small current units (e.g., 15 A to kA for panel sizing).

Students & Educators

Physics and electronics students use a current converter to check homework, understand SI prefixes and build intuition about electrical quantities. Teachers can integrate the tool in classroom demonstrations.

Electronics Hobbyists & Makers

Building Arduino projects, LED circuits or small robots often involves milliamperes and microamperes. A quick converter helps select the right resistors and power supplies.

Battery & Power Supply Designers

Capacity (mAh) and discharge rates depend on accurate current units. Converting between mA, A and even nA is critical for battery management systems and portable electronics.

Researchers in Physics & Biomedical Engineering

From measuring ion channel currents in the pA range to pulsed power in the MA range, scientists require a reliable unit converter for electric current that also handles CGS units found in older papers.

Why Use Our Free Online Electric Current Converter?

With so many converter tools available online, here is what makes this current unit converter stand out:

  • Completely free - no sign‑up, no hidden fees, no advertisements that break your workflow.
  • Real‑time conversion - results update instantly as you type, saving valuable time during calculations.
  • 10 units supported - all common SI metric prefixes plus CGS units (statampere, abampere) that many converters ignore.
  • High accuracy - every conversion uses the exact SI definition and standard prefix values, shown to six decimal places.
  • Privacy first - all computations run directly in your browser; no data is ever sent to any server.
  • Works offline - once loaded, the tool functions without internet, ideal for field work or classroom settings.
  • Fullscreen mode - enlarge the output for presentations or focused work.
  • Persistent memory - your last input and unit selections are stored locally for up to 30 days, so you can pick up where you left off.

Frequently Asked Questions (FAQ)

How do I convert amps to milliamps?

Multiply the number of amperes by 1,000. For example, 2 A = 2 × 1,000 = 2,000 mA. Our converter does this instantly when you select A as source and mA as target.

How do I convert milliamps to amps?

Divide the number of milliamperes by 1,000. For instance, 500 mA ÷ 1,000 = 0.5 A. That’s exactly what our mA to A converter provides in real time.

How many microamps in an amp?

There are exactly 1,000,000 microamperes (μA) in one ampere (A). This is because the prefix “micro‑” denotes a factor of 10−6.

What is the formula to convert kA to A?

Multiply the value in kiloamperes by 1,000. For example, 3.5 kA = 3,500 A. Our tool supports this conversion and many others.

How accurate is this electric current converter?

The converter uses exact SI conversion factors and displays results to six decimal places. For most engineering, educational and scientific purposes, this precision is more than sufficient. The underlying JavaScript floating‑point arithmetic may introduce a negligible round‑off error for extremely large or small numbers, but it remains well within acceptable tolerances.

What is a statampere?

The statampere (statA) is the unit of electric current in the electrostatic CGS system. One statA is approximately 3.335641×10−10 A. It is rarely used in modern engineering but appears in physics textbooks and theoretical electromagnetism.

What is an abampere?

The abampere (abA), also known as the biot, is the electromagnetic CGS unit of current. It is equal to exactly 10 A. It occasionally appears in legacy literature and some physics problems.

Can I convert picoamperes to nanoamperes?

Yes. Since 1,000 pA = 1 nA, you can convert directly by selecting pA as source and nA as target. The converter applies the correct factor (10-3) automatically.

Is my data safe when using this tool?

Absolutely. All calculations run locally on your device using client‑side JavaScript. No input values or conversion results are ever sent to a server. The optional localStorage feature only saves your preferences and last input on your own machine.

Does this converter work on mobile phones?

Yes. The responsive design adapts to any screen size, from smartphones to large desktop monitors. The split‑view panels stack vertically on smaller screens for easy use.

How can I convert current for different voltage or power calculations?

This tool focuses solely on electric current unit conversion. For power (P = V × I) or resistance (R = V ÷ I) calculations, you would combine the converted current with the appropriate voltage and Ohm's law. Once you have the current in the desired unit, you can use it in further electrical formulas.

Are there any limits on the numbers I can enter?

The input field accepts up to 20 characters and supports standard decimal notation. Very large or very small numbers (e.g., 1e9 for 1 GA) are handled correctly. The tool covers the range from approximately ±1e15 A, which is far beyond practical electrical engineering needs.

Pro Tips for Electric Current Unit Conversion

  • Memorize the milli‑ prefix: The most common conversion in electronics is between A and mA. Remember that 1 A = 1,000 mA and 1 mA = 0.001 A. This converter is always there, but knowing the factor speeds up mental estimates.
  • Use the Swap button as a check: After a conversion, click “Swap Units” to see the inverse conversion. If you converted 500 mA → 0.5 A, swapping should give 0.5 A → 500 mA - a quick sanity check.
  • Keep a reference of typical currents: Knowing that an LED uses ~20 mA, a smartphone charges at ~1–2 A, and a household circuit can handle 15–20 A helps you stay oriented when converting between units.
  • For pA/nA precision work: If you are working with extremely low currents, use the copy function to transfer the converted value directly into your lab notebook or simulation software without transcription errors.
  • Combine with other converters: After obtaining the current in the desired unit, you might need to plug it into a power or energy calculator. Use our converter to standardise the current unit first.

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