pA · nA · µA · mA · A · kA · MA
Current Converter: A, mA, µA and 4–20 mA
Convert A, mA, µA, nA, pA, kA and MA with clear formulas, all-unit results and batch export. Scale linear 4–20 mA sensor signals in either direction.
Choose the units and enter a value. Results update as you type. Zero and negative values are supported; the sign can represent current direction.
Enter a valid number. 0; 10⁻²⁴ ≤ |x| ≤ 10²⁴
Converted current
All equivalent values
Formula and calculation
SI prefix ladder
1 MA = 10³ kA = 10⁶ A
1 A = 10³ mA = 10⁶ µA = 10⁹ nA = 10¹² pA
Choose a destination unit on the ladder. For the same current, each step to a larger unit divides the number by 1,000; a smaller unit multiplies it by 1,000.
Batch conversion
Enter one value per line or separate values with semicolons, up to 100 values. A decimal point or comma is accepted; do not use thousands separators. The units above apply to every row.
Enter one value per line or separate values with semicolons, up to 100 values. A decimal point or comma is accepted; do not use thousands separators. The units above apply to every row.
| From unit | To unit |
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4–20 mA signal converter
For linear signals only: 4 mA represents the lower range value and 20 mA the upper value. The upper value must be greater than the lower. This does not diagnose sensor faults or certify electrical safety.
Enter a valid number. x_max > x_min; |x| ≤ 10¹²
Outside the configured 4–20 mA range. The result is a linear extrapolation; the marker stops at the edge of the scale. Check the transmitter specification.
Formula and calculation
Current counts charge passing each second
A · SI
The ampere is the SI base unit of electric current. Its definition fixes the elementary charge at exactly 1.602176634 × 10⁻¹⁹ C; 1 A = 1 C/s. The earlier parallel-wire definition is no longer the current definition.
BIPMA ≠ Ah · mA ≠ mAh
A and mA measure current; Ah and mAh measure electric charge. They cannot be converted without time. At constant current, 1 A for 1 hour corresponds to 1 Ah = 1,000 mAh. This is not an estimate of real battery runtime.
Try an example
500 mA = 0.5 A
2 A = 2,000 mA
250 µA = 0.00025 A
1 kA = 1,000 A
4–20 mA signal converter
For linear signals only: 4 mA represents the lower range value and 20 mA the upper value. The upper value must be greater than the lower. This does not diagnose sensor faults or certify electrical safety.
Texas InstrumentsWorked examples: mA to A and a 4–20 mA signal
To convert 500 mA to A, divide by 1,000: 500 ÷ 1,000 = 0.5 A. This changes the unit, not the current. To convert back, multiply amperes by 1,000.
For a linear transmitter with 4 mA = 0 bar and 20 mA = 10 bar, a 12 mA signal is halfway through the span: (12 − 4) ÷ (20 − 4) × 10 = 5 bar. Enter those range limits in the signal converter above. This is a scaling example, not a sensor calibration.
Current alone does not determine power. If you also know voltage, use the Ohm’s law calculator. For energy used over a period of time, continue with the energy converter and power–time calculation.
Current Converter: A, mA, µA and 4–20 mA
Formula and calculation
Choose the units and enter a value. Results update as you type. Zero and negative values are supported; the sign can represent current direction.
A ≠ Ah
A and mA measure current; Ah and mAh measure electric charge. They cannot be converted without time. At constant current, 1 A for 1 hour corresponds to 1 Ah = 1,000 mAh. This is not an estimate of real battery runtime.
4–20 mA signal converter
For linear signals only: 4 mA represents the lower range value and 20 mA the upper value. The upper value must be greater than the lower. This does not diagnose sensor faults or certify electrical safety.
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