What can a 32 A circuit run?

At 230 V, 32 A supports 7,360 W — enough for a 7.4 kW home EV charger, which is why 32 A is the standard charger circuit.

Should I load a circuit to 100%?

No. Continuous loads should be limited to about 80% of the breaker rating, so a 16 A circuit is good for roughly 2,900 W continuous.

Does this work for DC?

Yes, and it is simpler: for DC, watts = amps × volts with no power factor involved. Just substitute your actual DC voltage.

Amps to Watts Converter | A to W Calculator (230V)

Conversion Formula

W = A × 230 V

Power equals current multiplied by voltage (P = I × V) at the supply voltage you enter, with a power factor of 1. Resistive loads such as heaters and kettles match this closely; motors need a power-factor correction.

This formula uses the supply voltage currently set in the calculator (230 V). Change it above and this formula updates with it — the relationship is not a fixed unit pair.

Complete Guide to Amps to Watts Conversion

What is a Amps?

The ampere (A) is the SI base unit of electric current, measuring the flow of charge. Circuit breakers, cables, plugs and EV chargers are all rated in amps because current determines heating in the conductor.

What is a Watts?

The watt (W) is the SI unit of power — the rate of energy transfer, equal to one joule per second. Appliance nameplates, solar panels and chargers are all rated in watts or kilowatts.

How the Conversion Works

Ohm's power law states that power equals voltage multiplied by current. Rearranged, current equals power divided by voltage. This calculator uses 230 V, the harmonised single-phase supply voltage across Europe. For a US 120 V circuit, or a 12 V DC system, substitute that voltage instead.

Why This Conversion Matters

Cables and breakers are sized by current, not power. Every question about whether a circuit can run an appliance — an oven, a heat pump, a home EV charger — is really a question about amps. Getting this conversion wrong is how circuits overheat and breakers trip.

Scientific Context

For alternating current with inductive loads, real power (W) is apparent power (VA) multiplied by the power factor. Motors, compressors and older fluorescent lighting typically have a power factor of 0.8 to 0.95, so their actual current draw exceeds the simple W ÷ V result.

Step-by-Step Conversion Guide

Follow these steps to convert amps to watts manually:

Start with your value in amps

Example: You want to convert 5 A

Apply the conversion formula

Use the formula: W = A × 230 V

Calculate the result

5 A = 1,150 W

✓

Verify your answer

Use our calculator above to double-check your manual calculation.

Quick Mental Math Tip

Common Conversions

Calculated at 230 V (supply voltage). Change the value in the calculator above and this table recalculates.

Amps to Watts conversion table at 230 V
Amps (A)	Watts (W)	Watts → Amps
1	230	1 W = 0.0043 A
2	460	2 W = 0.0087 A
5	1150	5 W = 0.0217 A
6	1380	6 W = 0.0261 A
10	2300	10 W = 0.0435 A
13	2990	13 W = 0.0565 A
16	3680	16 W = 0.0696 A
20	4600	20 W = 0.087 A
32	7360	32 W = 0.1391 A
40	9200	40 W = 0.1739 A

When You'll Need This Conversion

Circuit and cable sizing

Check that appliance current stays within breaker and conductor ratings.

EV charger installation

A 7.4 kW charger needs 32 A at 230 V — the number that determines the whole installation.

Workshop and site power

Verify that tools and machines fit the available supply before plugging in.

Camping and marine hookups

Shore power is sold in amps (typically 6 A, 10 A or 16 A) while appliances are labelled in watts.

Pro Tips for Accurate Conversions

Apply the 80% continuous rule

Anything running for more than three hours should stay below 80% of the breaker rating.

Know your voltage

230 V in Europe, 120 V in North America, 100 V in Japan. The same appliance draws very different current.

Divide by power factor for motors

A 2 kW motor at 0.85 power factor draws about 10.2 A, not 8.7 A.

Common Mistakes to Avoid

Using 240 V or 120 V without checking

Regional voltage differences change the answer by a factor of two.

Confirm the nominal supply voltage before sizing anything.

Ignoring inrush current

Motors and compressors draw several times their running current at startup.

Select breaker curves (type C or D) that tolerate startup surges.

Loading a breaker to its exact rating

Breakers are thermal devices and will trip near their limit under sustained load.

Design continuous loads to 80% of the rating.

History & Background

The ampere is one of the seven SI base units, named after André-Marie Ampère. Europe's harmonisation on 230 V in the 1990s finally gave the continent one number for these calculations.