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Electric Current Converter

Convert between amperes, milliamps, microamps, kiloamps, and more — for electronics, electrical work, and physics.

Electric Current

A, mA, μA, kA

From
Result
1000

1 A = 1000 mA

Popular conversions

What Is an Electric Current Converter?

An electric current converter translates a flow of charge between units — amperes to milliamps, microamps to amps, amps to kiloamps. Current is the rate at which electric charge flows, and the SI unit is the ampere (A): one coulomb of charge per second. From the microamps of a sensor to the kiloamps of a power substation, current spans a huge range that metric prefixes manage.

This converter routes through the ampere using exact power-of-ten prefixes. Since the 2019 SI redefinition, the ampere is defined by fixing the elementary charge, making it a fundamental, exact unit. Enter a current in any prefix and read it across microamps, milliamps, amps, and kiloamps at once.

This is one category of the full Unit Converter — pair it with our percentage calculator or scientific calculator for related everyday maths.

How Current Conversion Works

Everything routes through the ampere

Each prefix has a fixed power-of-ten relationship to the ampere. The converter normalises to amps, then projects to every other prefix.

Metric prefixes scale by 1,000

1 A = 1,000 mA = 1,000,000 µA; 1 kA = 1,000 A. Moving between prefixes just shifts the decimal point by three places.

Current is charge per second

1 A = 1 coulomb/second. It's the same current everywhere in a simple series circuit — a key idea behind Ohm's law calculations.

Direction and type aside

AC and DC, and current direction, are separate from the magnitude conversion the tool performs — it changes prefix, not the physics.

Core Current Conversion Factors

Each step is a power of ten. Multiply to reach amperes; divide to come back.

A → mA

× 1000

One ampere is 1,000 milliamps. Most electronics work in the milliamp range.

mA → µA

× 1000

One milliamp is 1,000 microamps. Sensors and low-power circuits live here.

kA → A

× 1000

One kiloamp is 1,000 amperes, used for power distribution and fault currents.

How to Use the Current Converter

  1. 1

    Enter the current value

    Type the current you want to convert — a device draw, a sensor reading, a circuit rating.

  2. 2

    Choose the 'from' unit

    Pick amperes, milliamps, microamps, or kiloamps as your starting prefix.

  3. 3

    Choose the 'to' unit

    Select the target prefix, or swap the two to reverse direction.

  4. 4

    Read every prefix at once

    The all-units table shows the current across µA, mA, A, and kA together.

Key Current Concepts

Ampere

The SI base unit of current, defined since 2019 by fixing the elementary charge. One amp is one coulomb of charge flowing per second.

Milliamp and microamp

1 mA = 0.001 A; 1 µA = 0.000001 A. Electronics, sensors, and battery drains are usually measured in these smaller prefixes.

Current in a circuit

By Ohm's law, current = voltage ÷ resistance (I = V/R). In a series circuit the same current flows through every component.

Safety thresholds

Even small currents matter: a few milliamps through the body can be dangerous. Current, not voltage alone, is what harms.

Real-World Current Conversions

📱

Phone charging

A 2 A charger delivers 2,000 mA. Chargers and cables are rated in amps; battery capacity often in milliamp-hours.

💡

LED current

A typical LED runs at 20 mA (0.02 A). Electronics design works in milliamps for signal and indicator circuits.

🔌

Household circuits

A 15 A breaker protects a 1,800 W (at 120 V) circuit. House wiring is rated in amperes.

📡

Sensor draw

A low-power sensor might draw 50 µA (0.05 mA). Microamps matter for battery life in IoT devices.

⚡

Power substation

Fault currents can reach tens of kiloamps. Protective gear is rated in kA for short-circuit handling.

🔋

Battery rating

A 3,000 mAh battery supplying 500 mA lasts about 6 hours. Capacity and draw both use milliamp units.

Best Practices for Current Conversion

  • ✓Carry the prefix carefully. mA and µA differ by 1,000; A and mA by 1,000. A dropped prefix changes a current by orders of magnitude — critical for component selection.
  • ✓Use Ohm's law to cross-check. I = V/R links current to voltage and resistance. If a converted current looks wrong, verify it against the circuit's voltage and resistance.
  • ✓Match the prefix to the domain. Electronics: mA and µA. Mains and appliances: A. Power distribution: kA. Use the scale appropriate to the application.
  • ✓Mind milliamp-hours vs milliamps. mAh is charge capacity (current × time), not current. Don't convert a battery's mAh rating as if it were a current in mA.
  • ✓Respect safety limits. Currents as low as 10–30 mA through the body can be hazardous. Treat current conversions in safety contexts with care.

Common Current Conversion Mistakes

Dropping a metric prefix

Reading mA as A, or µA as mA, shifts the current 1,000-fold — enough to fry a component rated for the smaller value.

Confusing mAh with mA

Milliamp-hours measure charge capacity, not current. They include a time dimension and aren't a current reading.

Mixing up current and power

Amps measure current, not power. Power (watts) is voltage × current, so a current value alone doesn't give wattage.

Ignoring AC vs DC context

Conversions handle magnitude, but AC and DC behave differently in a circuit. The prefix conversion doesn't capture that distinction.

Why Current Conversion Matters

Current determines what wire gauge to use, what fuse or breaker protects a circuit, how long a battery lasts, and whether a contact is safe to touch — and it spans microamps to kiloamps, all managed with metric prefixes. A dropped prefix isn't a rounding error; it can mean a component sized 1,000 times too small or a safety threshold badly misjudged.

Because current ties directly to Ohm's law and to power, getting its prefix right keeps electronics design, electrical installation, and battery-life estimates consistent. A converter that routes through the ampere and exposes µA, mA, A, and kA together lets a hobbyist, electrician, or engineer read a current at the scale the task demands.

Built for electronics hobbyists, electricians, electrical engineers, and students converting between amps, milliamps, and microamps.

Linear unit factors follow the BIPM SI brochure, the NIST Guide to the SI, and ISO 80000. Currency rates load live from open.er-api.com; crypto prices from CoinGecko. See our methodology and editorial policy. Educational only — not certified for regulated trading, settlement, medical, or aerospace use.

Electric Current Converter FAQs

Multiply amperes by 1,000 to get milliamps, since one amp is 1,000 mA. So 2 A is 2,000 mA, and an LED's 20 mA is 0.02 A. To go from microamps to milliamps, divide by 1,000 again (1 mA = 1,000 µA).

The ampere is the SI base unit of electric current, equal to one coulomb of charge flowing per second. Since the 2019 SI redefinition it's defined by fixing the elementary charge at exactly 1.602176634 × 10⁻¹⁹ coulombs, making it a fundamental, exact unit.

Milliamps (mA) measure current — the rate of charge flow. Milliamp-hours (mAh) measure charge capacity — current multiplied by time. A 3,000 mAh battery can supply 3,000 mA for one hour, or 300 mA for ten hours. They're related but not the same unit.

Use Ohm's law: current (I) = voltage (V) ÷ resistance (R). So 12 V across 6 Ω gives 2 A. This is why a current converter pairs naturally with voltage and resistance conversions when analysing a circuit.

Because it's the current passing through the body that disrupts the heart and nerves, not voltage alone. As little as 10–30 mA can cause harm. Voltage matters because it drives current through the body's resistance, but the damaging quantity is the resulting current.

It uses exact metric-prefix definitions (1 A = 1,000 mA = 10⁶ µA, 1 kA = 1,000 A) and routes every conversion through the ampere at full precision, so the result is exact to your input precision.

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