The calculator on this page helps users convert electrical power (Watts) into current (Amps) for a given voltage supply. It performs conversion for DC and AC electrical circuits, including single-phase and three-phase systems. This tool is useful for electricians, engineers, and anyone working with electrical systems to ensure proper wire sizing, circuit protection, and load management.
Our calculator has the following features, helping users to use it without any hurdles:
Our tool serves many practical purposes, including some of which are:
Users can check if the generator has sufficient amperage to handle the total power consumption of their appliances, ensuring safe and efficient operation during a power outage.
The calculator helps to convert watts to amps, which lets users ensure safety by matching the capacity of the circuit to the total amperage of the devices connected to it.
Electrical engineers can use the watts to amps converter to make sure the machinery operates within the amperage limits and design power distribution panels accordingly.
Users can calculate the amperage of electrical devices connected to a circuit, which further helps compare it to the rating of the circuit breaker. This is extremely helpful in troubleshooting the tripping of the breaker.
Helps HVAC mechanics to confirm if the large circuit breakers, air conditioners, and heaters operate safely.
Watts to amps conversion is governed by the formulas that are adjusted to different electrical systems. These include:
\(I\;=\;\frac{P}{V}\)
For 120 V and 240 W, we have:
\(I = \frac{P}{V}\)
\(I = \frac{240W}{120V}\)
\(I = 2A\)
$$I\;=\;\frac{P}{V × PF}$$
For 500 W, 230V, and power factor = 0.8, we have:
\(I = \frac{P}{V \times PF}\)
\(= \frac{500W}{230V \times 0.8}\)
\(= \frac{500W}{184V}\)
\(= 2.72A\)
Line to Line Voltage:
\(I\;=\;\frac{P}{\sqrt 3*\text{V}×\text{PF}}\)
Example:
I = \frac{P}{\sqrt{3} \times V \times PF}\)
\(= \frac{1000W}{\sqrt{3} \times 400V \times 0.9}\)
\(= \frac{1000W}{623.53V}\)
\(= 1.6A\)
Line to Neutral Voltage:
\(I\;=\;\frac{P}{ 3*\text{V}×\text{PF}}\)
Example:
\(I = \frac{P}{3 \times V \times PF}\)
\(= \frac{900W}{3 \times 230V \times 0.85}\)
\(= \frac{900W}{586.5V}\)
\(= 1.53A\)
1 amp is equal to a 120 W power outage.
Considering the circuit operates at a source voltage of 120V, 1500W is equivalent to 12.5 amperes. However, entering this power value in watts to amps calculator gives you more accurate amps calculations.
Yes, the tool helps to convert power to current for solar inverters, charge controllers, and battery banks.
Higher voltage results in lower current for the same power level, which is useful for reducing energy losses in electrical transmission.
We have another watt calculator that helps you calculate power wattage based on the resistance, current, and supply voltage in an electrical circuit.
| Voltage | Used In |
|---|---|
| 100V | Japan |
| 110V | Some parts of the USA, Canada, Taiwan, Colombia |
| 120V | USA, Canada, Mexico, some Caribbean countries |
| 127V | Brazil, Venezuela, Saudi Arabia |
| 220V | China, Russia, most of Asia, South Africa, Australia, New Zealand |
| 230V | Most of Europe, India, UK, UAE, Singapore, South Korea |
| 240V | Australia, UK, some parts of Africa and Asia |
| 277V | USA (industrial & commercial lighting applications) |
| 400V | Europe (industrial three-phase systems) |
| 415V | UK, Australia, South Africa (three-phase systems) |
| 480V | USA, Canada (industrial three-phase systems) |
| 600V | Canada (industrial & heavy machinery) |
| Power Factor | What Does It Mean? |
|---|---|
| -1 | Perfect Regeneration - Ideal energy recovery with no real power losses. |
| -0.9 | Regenerative with Minor Losses - Power is returned with slight reactance losses. |
| -0.8 | Regenerative with Losses - Energy is returned but with noticeable reactive losses. |
| -0.7 | Regenerative, Fairly Inefficient - Power is returned, but reactive losses are high. |
| -0.6 | Regenerative, Moderately Inefficient - Energy is being recovered, but with moderate losses. |
| -0.5 | Regenerative, Noticeable Losses - Significant power loss in regeneration mode. |
| -0.4 | Regenerative, Poor Efficiency - Inefficient power recovery due to reactance. |
| -0.3 | Regenerative, Very Inefficient - Efficiency is low with high reactive losses. |
| -0.2 | Regenerative, Extremely Inefficient - Most energy is wasted due to poor efficiency. |
| -0.1 | Regenerative, Critical Losses - Almost all energy is lost in the system. |
| +1 | Ideal - Perfect efficiency with no energy wasted. |
| +0.9 | Efficient - Very small amount of reactive power loss. |
| +0.8 | Good - Minor energy losses due to reactive power. |
| +0.7 | Fair - Moderate energy losses from reactance. |
| +0.6 | Fairly Low - Noticeable reactive losses, consider correction. |
| +0.5 | Low - Significant power losses, correction recommended. |
| +0.4 | Poor - Substantial energy losses from reactance. |
| +0.3 | Very Poor - Severe losses, correction is necessary. |
| +0.2 | Extremely Poor - Major inefficiencies, correction strongly recommended. |
| +0.1 | Critical - Almost all power is lost to reactive energy. |
| Watts (W) | DC Amps (A) | AC Single-Phase Amps (A) [PF=0.8] | AC Three-Phase Amps (A) Line-to-Line [PF=0.8] | AC Three-Phase Amps (A) Line-to-Neutral [PF=0.8] |
|---|---|---|---|---|
| 100W | 0.83 | 1.04 | 0.60 | 0.28 |
| 200W | 1.67 | 2.08 | 1.20 | 0.56 |
| 300W | 2.50 | 3.13 | 1.80 | 0.83 |
| 400W | 3.33 | 4.17 | 2.40 | 1.11 |
| 500W | 4.17 | 5.21 | 3.00 | 1.39 |
| 600W | 5.00 | 6.25 | 3.60 | 1.67 |
| 700W | 5.83 | 7.29 | 4.20 | 1.94 |
| 800W | 6.67 | 8.33 | 4.80 | 2.22 |
| 900W | 7.50 | 9.38 | 5.40 | 2.50 |
| 1000W | 8.33 | 10.42 | 6.00 | 2.78 |
| 1200W | 10.00 | 12.50 | 7.20 | 3.33 |
| 1500W | 12.50 | 15.63 | 9.00 | 4.17 |
| 1800W | 15.00 | 18.75 | 10.80 | 5.00 |
| 2000W | 16.67 | 20.83 | 12.00 | 5.56 |
| 2500W | 20.83 | 26.04 | 15.00 | 6.94 |
| 3000W | 25.00 | 31.25 | 18.00 | 8.33 |
| 3500W | 29.17 | 36.46 | 21.00 | 9.72 |
| 4000W | 33.33 | 41.67 | 24.00 | 11.11 |
| 4500W | 37.50 | 46.88 | 27.00 | 12.50 |
| 5000W | 41.67 | 52.08 | 30.00 | 13.89 |
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