Ampere Calculator

Calculate amperes with the Ampere Calculator

Convert Volts, Watts & Amps ﹣ Ampere Calculator

The Ampere Calculator allows you to calculate the amperage in amperes based on the electrical voltage in volts and the power in watts of an electrical appliance or system. Simply enter the existing voltage in volts and the power in watts, and the Ampere Calculator will then automatically determine the corresponding amperage in amperes.


Instead of calculating the amperage, you want to calculate the voltage in volts or the power in watts? Then use our guide pages with the Volt Calculator or the Watt Calculator.

Contents on the topic "Calculating Amperes"

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Why do you need to calculate amperes?

Calculating amperes is important to ensure that electrical circuits and equipment operate safely and efficiently. In many electrical applications, such as installing electrical wiring, choosing the right fuses or sizing electric motors, it is necessary to calculate the required amperage in amperes. If the amperage is too high, this can lead to overheating, fires or even explosions. If the amperage is too low, the performance of the appliance or circuit may be affected. Therefore, it is important to calculate the correct amperage to ensure safe and effective operation.

An example is choosing the correct battery size for an electronic device. If the battery does not supply enough current, the device will not function properly. However, if the battery supplies too much current, it can cause overheating and damage to the device.

In electronics, it is also important to know the current requirements of components such as LEDs, transistors or microcontrollers to ensure that they are operating at the correct amperage. Calculating amperes is therefore an essential part of planning and implementing electrical projects.

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What is Ampere actually?

Ampere is the unit of electrical current strength and is represented by the unit symbol "A". It is named after the French mathematician and physicist André-Marie Ampère, who made important contributions to the study of the magnetic field and electrodynamics. An ampere defines the current that flows through a conductor when an electric charge of one coulomb flows through it in one second. In mathematical terms, one ampere corresponds to one coulomb per second (1A = 1C/s). Electric current is the flow of electric charge through a conductor. When a voltage is applied to a conductor, electrons are moved through the conductor in a certain direction, resulting in the generation of an electric current.

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What is the formula for amperes?

The current in amperes is obtained by dividing the electrical power in watts by the voltage in volts. The formula is therefore:

Formula for amperes
Ampere (A) = Power (W) / Voltage (V)

This formula indicates the amount of current required by an electrical appliance or device when the voltage and power are known. Voltage (V) is measured in volts and indicates how much electrical potential difference there is between two points, while power (W) is measured in watts and indicates how much electrical current flows through a component in a given time. By dividing the power by the voltage, you get the amperage (in amperes) that the appliance or system requires.

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How does the Ampere Calculator work?

In the ampere calculator, the current in amperes is already preset under "What should be calculated?” According to the formula Ampere (A) = Power (W) / Voltage (V), the ampere calculator still needs the two remaining entries for the power in watts and the voltage in volts to calculate the amperage in amperes. These two required inputs are described below:

Voltage in volts

Ampere Calculator: Voltage (Volt) Please enter the electrical voltage in volts. If you have an indication in millivolts (mV), you must first multiply this value by 1000 to convert it into volts. The electrical voltage has the formula symbol "U" (from Latin urgere: to urge, to press). In the international system of units, voltage is expressed in volts and has the unit symbol "V".

Power in watts

Ampere calculator: Power (Watt) Please enter the electrical power in watts. If you have an indication in milliwatts (mW), you must first multiply this value by 1,000 to convert it into watts. If you have a value in kilowatts (kW), you must first divide this value by 1000 to convert it into watts. In the international system of units, electrical power is given in watts and has the unit symbol "W". The electrical power has the formula symbol "P" (from English power).

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How many amps does an e-bike have?

The battery of an e-bike requires a certain amperage, which is calculated from its values for voltage in volts and power in watts. If the battery of the e-bike has an output voltage of 36 volts and a power of 480 watts, the Ampere Calculator will calculate as follows:

Calculation of amperage or current of an e-bike
480 watts / 36 volts = 15 amps
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Video on "How to calculate amps from watts"

Finally, a video on the subject of calculating amperes:

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Source information

As source for the information in the 'Convert Volts, Watts & Amps' category, we have used in particular:

Last update on March 22, 2023

The last changes in the 'Convert Volts, Watts & Amps' category were implemented by Stefan Banse on March 22, 2023. The main changes were: