Current Converter

Converting a current takes four quick choices. The tool only changes the unit, so the current itself stays exactly the same.

1. Enter the current value in the first field.
2. Pick the unit it is in now, then pick the unit you want to convert to.
3. Choose how many decimal places to show in the result.
4. Press Calculate to see the converted value, the factor used, and the steps. Use Swap units to reverse the conversion.

Result = Value times (From unit in amps divided by To unit in amps). Every current unit is defined by its size in amps, so each conversion is a single multiplication. The ampere, written A, is the SI base unit of electric current. A milliampere is one thousandth of an amp, a microampere is one millionth, and a kiloampere is one thousand amps.

The prefixes follow the metric system, so each step up or down the scale is a factor of 1,000. That is why 1 amp equals 1,000 milliamps, 1 milliamp equals 1,000 microamps, and 1 microamp equals 1,000 nanoamps. The conversion is exact, because the prefixes are definitions, not measurements.

Convert 2.5 amps to milliamps. First write the factor. 1 amp = 1,000 milliamps. Then multiply the value by the factor. 2.5 times 1,000 = 2,500 milliamps. The current is the same in both units, only the number changes, because milliamps are smaller units.

Going the other way uses division. 750 milliamps divided by 1,000 = 0.75 amps. The tool shows the factor for your own units every time, so you can check the step yourself.

Most everyday currents sit in the milliamp range. A phone charger delivers around 500 milliamps to 3,000 milliamps, an LED draws about 20 milliamps, and a household circuit breaker is usually rated at 15 or 20 amps. Picking the unit that fits the size keeps the number easy to read.

Current and power are different quantities, and they need different units. Amps measure how much electric charge flows each second. Watts measure power, which is how fast energy is used. You cannot convert amps to watts with a fixed factor, because watts also depend on voltage.

The link between them is watts = amps times volts. A current of 2 amps at 120 volts is 240 watts, while the same 2 amps at 12 volts is only 24 watts. If you need power, measure or enter the voltage too. The power converter handles watts, and the voltage converter handles volts.

Because current conversion is exact decimal shifting, the only place error can creep in is rounding. Converting 1 amp to milliamps gives exactly 1,000, with no rounding at all. Converting 1 amp to megaamps gives 0.000001, so a short decimal setting would round it to 0.00 and hide the answer.

Use more decimals when the result is very small or very large, and fewer when the number is a round one. The decimals selector on this tool lets you match the precision to the job, and the step by step breakdown always shows the unrounded factor so you can see what was multiplied.