# Amp to Wire Size Calculator

**The Amp to wire size calculator will help you determine the appropriate electrical wire for your new connection.** Keep reading to find out how to size your cables.

## How to calculate the wire size based on the system amperes?

The following information is required before we start:

**The amperage**at which your system will run: It can be direct current or alternate current (single-phase or three phases).- System configuration: Single-phase / Three-phase.
- The system voltage.
- Wire size material since it affects the electrical resistivity.
- Distance between your energy source and the equipment you want to energize.
- Allowed voltage drop per the equipment requirements.

Once we have it all, we will use the following formula:

where:

- $\%\text{drop}$ — Allowable voltage drop, in %.
- $V$ — Source voltage, measured in volts.
- $I$ — System current, measured in amperes.
- $\varrho$ — Resistivity of the conductor material, measured in ohmmeters;
- $L$ — Length of the wire, measured in meters; and
- $\phi$ — Phase factor, 1 for DC / AC single phase and $\sqrt{3}/2$ for AC three-phase.
- $A$ — Cross-sectional wire area measured in square meters.

The result will be expressed in mm² (if using the metric system).

It is common for wires to indicate their size in AWG (American Wire Gauge) units. Do not worry; our Amp to wire size calculator also provides results in AWG.

## How do you use this amp to wire size calculator?

To find the desired wire size:

**Verify your connection: DC or AC single/three-phase.****Specify the voltage source and define the system amperage.****Define the wire material**you will use, the operating temperature, and the voltage drop.- Finally,
**input the length of your cable**(remember, it's a one-way distance).

As a result, the Amp to wire size calculator will indicate the cross area of the cable you need to install.

## Other useful tools like the amp to wire size calculator

Since you already know how to size a wire based on the required amperes in the system, you can take a look at other calculators:

## FAQ

### How do I calculate amp wire size?

You can use Omnicalculator's Amp to wire size tool or do the following:

- For AC single phase:
**Get the amperage of your system, one-way length of the cables you want to install, and wire material resistivity.** - Multiply all the above values and multiply the result by two.
**Divide the previous result by the voltage drop in the system.**- The final result represents the cable area you need. Now go to an AWG chart and select your cable.

### What size wire can handle amps?

The answer depends on the following variables:

**System amperage and voltage.****Distance**between feeder and equipment.**Wire material.**

We recommend you check the Omnicalculator's Amp to wire size calculator for a direct result.