Calculator Ampere

Calculate electrical current (amperes) from voltage, power, or resistance using Ohm's Law and power formulas.

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About This Tool

This ampere calculator helps you compute electrical current (measured in amperes or amps) using Ohm's Law (I = V/R) and the power formula (I = P/V). Simply enter any two known values - voltage (volts), power (watts), or resistance (ohms) - and the tool will instantly calculate the missing values including current. It's perfect for electrical engineering, circuit design, home wiring projects, and educational purposes. The calculator provides clear formulas used and displays all calculated values in a well-formatted results section.

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How to Use

Enter any two known values in the voltage, power, or resistance fields
Leave the field you want to calculate empty
Click the 'Calculate Amperes' button
View the calculated current and other values in the results section
Use the 'Reset' button to clear all fields and start over

Frequently Asked Questions

Find Quick Answers

What formulas does this ampere calculator use?

The calculator uses Ohm's Law (I = V/R) for voltage and resistance calculations, and the power formula (I = P/V) for power and voltage calculations. When you provide any two values, it determines which formula to apply automatically.

Can I calculate watts or volts from amperes?

Yes! This is a bidirectional calculator. If you know the current (amperes) and one other value (voltage or resistance), you can calculate the missing values including power (watts) or voltage (volts).

Is this calculator suitable for AC and DC circuits?

This calculator works for both AC and DC circuits when dealing with resistive loads. For reactive loads (inductors, capacitors) in AC circuits, additional factors like power factor would need to be considered.

What units does the calculator use?

The calculator uses standard electrical units: Amperes (A) for current, Volts (V) for voltage, Watts (W) for power, and Ohms (Ω) for resistance. All calculations are performed using these base units.

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