Volts and Amps to Watts Conversion Calculator

Use our volts to watts calculator is a tool that helps convert voltage in watts using conversion Watt’s Law, which states that power (P) in watts is equal to voltage (V) in volts multiplied by current (I) in amperes (amps).

P (W) = V (V) x I (A)

Imagine you have a 120-volt power source and want to know how much power it can deliver to a device with a resistance of 10 ohms. The volts to watts conversion help you determine that the power output is 1440 watts.

Volts and Amps to Watts Calculator

Volts (V) Converted to	Amps (A)	Watts (W)
5 V	1 A	5 W
5 V	2 A	10 W
5 V	3 A	15 W
5 V	4 A	20 W
5 V	5 A	25 W
12 V	1 A	12 W
12 V	2 A	24 W
12 V	3 A	36 W
12 V	4 A	48 W
12 V	5 A	60 W
18 V	1 A	18 W
18 V	2 A	36 W
18 V	3 A	54 W
24 V	1 A	24 W
24 V	2 A	48 W
24 V	3 A	72 W
120 V	1 A	120 W
120 V	2 A	240 W
120 V	3 A	360 W
120 V	4 A	480 W
120 V	5 A	600 W
220 V	1 A	220 W
220 V	2 A	440 W
220 V	3 A	660 W
240 V	1 A	240 W
240 V	2 A	480 W
240 V	3 A	720 W
240 V	4 A	960 W
240 V	5 A	1200 W
250 V	1 A	250 W
250 V	2 A	500 W
100 V	1 A	100 W
100 V	2 A	200 W
125 V	1 A	125 W
125 V	2 A	250 W
200 V	1 A	200 W
200 V	2 A	400 W
1000 V	1 A	1000 W
1000 V	2 A	2000 W
230 V	1 A	230 W
230 V	2 A	460 W
115 V	1 A	115 W
115 V	2 A	230 W

Volts to Watts Conversion Formula

The formula for converting volts to watts is straightforward:

P = V * I

Where:

• P is power in watts (W)
• V is voltage in volts (V)
• I is current in amperes (A)

Let’s say you have a 12-volt battery and a 6-ohm resistor.

To calculate the power:

P = (12²) / 6 = 144 / 6 = 24 watts

Consider a 24-volt device that uses 3 amps of current.

The power can be calculated as:

P = 24 V x 3 A = 72 W

This indicates that the device consumes 72 watts of power.

How To Convert Volts to Watts

Identify the Voltage: Determine the voltage of the device in volts (V).

Determine the Current: Find the current in amperes (A) that the device uses.

Apply the Formula: Use the formula P = V x I to calculate the power in watts.

With a 12-volt battery that supplies 5 amps, the calculation would be:

P = 12 V x 5 A = 60 W

The battery provides 60 watts of power.

Suppose you have a 220-volt power source and want to calculate the power consumed by a heater with a resistance of 44 ohms.

Voltage (V) = 220 volts

Resistance (R) = 44 ohms

P = (220²) / 44 = 48,400 / 44 = 1,100 watts

The heater consumes 1,100 watts of power.

What is 240 Volts in Watts?

• For a 20-ohm resistance: P = (240²) / 20 = 57,600 / 20 = 2,880 watts
• For a 50-ohm resistance: P = (240²) / 50 = 57,600 / 50 = 1,152 watts
• For a 100-ohm resistance: P = (240²) / 100 = 57,600 / 100 = 576 watts

To convert 240 volts to watts, you need to know the current flowing through the circuit.

For example, if the current is 1 amp, the power can be calculated as:

P = 240 V x 1 A = 240 W

If the current is 5 amps, the calculation would be:

P = 240 V x 5 A = 1200 W

This means that at 240 volts, the power consumption can vary significantly depending on the current.

How Many Watts is 18V?

• For a 2-ohm resistance: P = (18²) / 2 = 324 / 2 = 162 watts
• For a 5-ohm resistance: P = (18²) / 5 = 324 / 5 = 64.8 watts
• For a 10-ohm resistance: P = (18²) / 10 = 324 / 10 = 32.4 watts

To find out how many watts are in 18 volts, you again need the current. For example, if a device operates at 18 volts and uses 2 amps, the power is:

P = 18 V x 2 A = 36 W

The current is 3 amps, then:

P = 18 V x 3 A = 54 W

The power consumed by an 18-volt device can range based on the current it draws.

What is 5V in Watts?

• For a 1-ohm resistance: P = (5²) / 1 = 25 / 1 = 25 watts
• For a 2-ohm resistance: P = (5²) / 2 = 25 / 2 = 12.5 watts
• For a 5-ohm resistance: P = (5²) / 5 = 25 / 5 = 5 watts

For a device operating at 5 volts, the wattage calculation depends on the current.

For instance, if it draws 1 amp, the power is:

P = 5 V x 1 A = 5 W

It consumes 2 amps, the calculation would be:

P = 5 V x 2 A = 10 W

This indicates that a 5-volt device can consume between 5 and 10 watts depending on the current.

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