Electrical Current Unit Converter

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Electrical Current Unit Converter + Reference Table & Applications

You're wiring a linear actuator to a motor controller, and the spec sheet lists stall current in amps while your relay datasheet uses milliamps for coil current. Mixing up units — or worse, sizing a fuse based on the wrong scale — can fry components or start a fire. This converter instantly translates between microamps, milliamps, amps, and kiloamps. You get a live conversion tool, a reference table, worked examples, and practical guidance on current ratings for actuator projects.

What Is Electrical Current?

Electrical current measures the flow rate of electric charge through a conductor. We express it in amperes (A), and the common sub-units — microamps, milliamps, and kiloamps — simply scale that base value up or down by powers of 10.

Simple Explanation

Think of current like water flow through a pipe. Voltage is the pressure pushing water through, and current is how much water actually flows per second. A microamp is a tiny trickle — barely detectable. A kiloamp is a firehose. Most actuator work lives right in the middle, in the 1–10 amp range, which is enough flow to do real mechanical work without requiring industrial-scale wiring.

Current Scale — Microamps to Kiloamps (Logarithmic) 1 µA 10⁻⁶ A 1 mA 10⁻³ A 1 A 10⁰ A 1 kA 10³ A Sensor Signals 2–10 A FIRGELLI Actuators Conversion Formula Value in Target Unit = Value × (Source Factor ÷ Target Factor) Leakage Industrial / Welding

Electrical Current Unit Converter

1,000,000 µA
1,000 mA
1 A
0.001 kA

🎥 Video — Electrical Current Unit Converter

Electrical Current Unit Converter

How to Use This Calculator

The converter updates instantly — no button to press. Here's the workflow:

  1. Enter your current value in the input field. The default is 1, but type any number — decimals and negatives work fine.
  2. Select your source unit from the dropdown. Choose from µA, mA, A, or kA to match the value you have.
  3. Read all 4 conversions instantly in the result boxes below. Every unit updates live as you type or change the source unit.
  4. Compare against your component ratings. If your actuator draws 5 A and your relay is rated at 3,000 mA, you can immediately see the mismatch.

Electrical Current Unit Formula

The conversion is straightforward — every current unit relates to amperes by a fixed multiplier. Convert any value to amps first, then convert from amps to your target unit:

Value in Amps = Input Value × Source Unit Factor

Output Value = Value in Amps ÷ Target Unit Factor

Symbol Variable Factor (relative to Amps)
µA Microamps 0.000001
mA Milliamps 0.001
A Amps (base unit) 1
kA Kiloamps 1000

Simple Example

Problem: You have a current reading of 1 A. Express it in all 4 units.

Step 1 — Convert to amps (base unit):
1 A × 1 (factor for A) = 1 A

Step 2 — Convert to each target unit:
Microamps: 1 ÷ 0.000001 = 1,000,000 µA
Milliamps: 1 ÷ 0.001 = 1,000 mA
Amps: 1 ÷ 1 = 1 A
Kiloamps: 1 ÷ 1000 = 0.001 kA

Practical meaning: 1 amp is a very common current level for electronic devices and small actuators under light load. That same current expressed as 1,000 mA is exactly what you see printed on USB chargers and power supplies — same current, different label.

Engineering Applications

FIRGELLI Actuator Current Ratings

Our actuators typically draw 2 to 10 A under load at 12 V — always check the spec sheet for your specific model and load condition. That range might seem wide, but it depends on the actuator's stroke length, gear ratio, and how much force you're asking it to push or pull. A FIRGELLI Premium actuator running unloaded might draw just 0.5 A, but put it under full rated load and you'll see 4–6 A easily. The number you care about for design purposes is the maximum — not the typical — because your wiring, connectors, and fuse all need to handle the worst case without breaking a sweat.

When you're reading our spec sheets, you'll see current listed in amps (A). But if you're integrating with a microcontroller-based system that uses a current sensing IC, that IC might report values in milliamps. Use this converter to sanity-check your readings. If your sensor reports 4,500 mA and the spec sheet says 4.5 A running current, you're in the right ballpark. If you see 450 mA at full load... something is very wrong with your sensor or your wiring.

Stall Current — The Number You Can't Ignore

Stall current can be 3 to 5 times the running current — your fuse and wiring must be rated for stall, not just running current. This is the single most common mistake we see in DIY actuator projects. If your actuator draws 5 A during normal operation, stall current could hit 15–25 A. That happens when the actuator reaches end of travel, jams against an obstruction, or overloads mechanically. It's brief — usually under a second before a thermal breaker or your controller cuts power — but your wiring needs to survive it.

Size your wire gauge and fuse for the stall current. Use 16 AWG or heavier for runs under 10 feet when stall current might hit 20 A. A slow-blow fuse rated at 15–20 A handles the brief stall spike without nuisance tripping during normal operation. If you size everything for the 5 A running current, you'll blow fuses constantly or — worse — melt wire insulation before anything trips.

Keeping High-Current and Low-Current Wiring Separate

The milliamp range belongs to sensor and signal circuits — limit switches, potentiometer feedback, microcontroller I/O, and communication lines. These circuits carry tiny currents, often 1–20 mA, and they're sensitive to electromagnetic interference (EMI). Keep high-current actuator wiring physically separated from low-current signal wiring to avoid interference. We're talking at least 2–3 inches of separation, or use shielded cable for the signal lines.

Why does this matter? A 12 V actuator wire carrying 8 A creates a magnetic field. If your feedback potentiometer wire runs right alongside it, that field induces noise on the signal — and your controller reads jittery position data. The fix is simple: route power wires on one side of your enclosure and signal wires on the other. Use twisted-pair for analog signals where possible. It costs almost nothing and eliminates hours of troubleshooting later.

Advanced Example

Scenario: You're designing a system with 2 FIRGELLI actuators. Each draws 6.5 A running current and has a stall current of 22 A. Your current sensor outputs readings in milliamps. You need to verify fuse sizing and confirm your sensor readings make sense.

Step 1 — Convert running current to milliamps:
6.5 A × (1 ÷ 0.001) = 6,500 mA per actuator
Total for 2 actuators: 6,500 × 2 = 13,000 mA = 13 A

Step 2 — Convert stall current to milliamps:
22 A × (1 ÷ 0.001) = 22,000 mA per actuator
Total stall for 2 actuators (worst case, both stall simultaneously): 22,000 × 2 = 44,000 mA = 44 A

Step 3 — Express total stall current in kiloamps for panel specifications:
44 A × (1 ÷ 1000) = 0.044 kA

Step 4 — Design interpretation:

Your current sensor should read approximately 13,000 mA when both actuators run at full load. If it reads significantly less, check for loose connections or undersized wire creating voltage drop. Your fuse must handle 44 A stall without blowing — a 50 A slow-blow fuse gives adequate margin. The wire gauge for the main supply run needs to handle 44 A: use 6 AWG for runs up to 15 feet, or 8 AWG for very short runs under 5 feet. Running 16 AWG wire — which handles the 13 A running current just fine — would be dangerously undersized for the 44 A stall condition.

Frequently Asked Questions

How many milliamps are in 1 amp? +

There are exactly 1,000 milliamps in 1 amp. Just multiply amps by 1,000 to get milliamps, or divide milliamps by 1,000 to get amps. It's the most common conversion you'll encounter in actuator and electronics work.

Should I size my wiring for running current or stall current? +

Always size for stall current. Stall current can hit 3–5 times the running current, and it happens every time the actuator reaches end of travel or encounters an obstruction. Your wires and fuses must handle that peak without melting insulation or causing a fire hazard. Use a slow-blow fuse to tolerate the brief stall spike.

What's the difference between µA and mA — when would I encounter microamps? +

Microamps (µA) are 1,000 times smaller than milliamps. You'll encounter µA primarily in standby or sleep-mode current draw for microcontrollers, leakage current specifications for capacitors, and very sensitive sensor circuits. In actuator projects, you'll rarely work directly in µA unless you're measuring quiescent current draw of a control board.

Can this converter handle AC current values, or is it DC only? +

The unit conversion itself is identical for AC and DC — 1 amp is 1 amp regardless. However, AC current is typically expressed as RMS (root mean square), which represents the equivalent DC heating value. This converter works perfectly for both — just make sure you know whether the AC value you're converting is RMS or peak, because the peak value is about 1.414 times the RMS value.

My multimeter reads in amps but my data logger shows milliamps — how do I compare them? +

Just convert one to match the other. If your multimeter reads 4.7 A, that's 4,700 mA. If your data logger shows 4,700 mA, the readings agree. Use this converter to quickly sanity-check — type in the multimeter reading, select A, and confirm the mA output matches your logger. If there's a significant discrepancy, check your measurement setup for shunt resistor errors or probe placement issues.

When would I ever need kiloamps in a DIY project? +

Honestly, almost never for typical DIY work. Kiloamps show up in industrial welding, short-circuit fault analysis, and electrical panel interrupting capacity ratings. We include kA in this converter for completeness and because some panel specs list fault current in kA. If you're working in the kA range at your workbench, something has gone seriously wrong.

About the Author

Robbie Dickson — Chief Engineer & Founder, FIRGELLI Automations

Robbie Dickson brings over two decades of engineering expertise to FIRGELLI Automations. With a distinguished career at Rolls-Royce, BMW, and Ford, he has deep expertise in mechanical systems, actuator technology, and precision engineering.

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