# 8 Best Free Online Voltage Drop Calculator Websites

Here is a list of the best free online voltage drop calculator websites. When electricity is transferred over a distance, it loses the voltage along with the length. The losses might not be noticeable over short distances but for long-distance, the losses can be significant. To design an accurate electrical system, you should factor in the voltage drop.

There are multiple factors that are responsible for the voltage drop. This includes connector material, distance, wire size, etc. To calculate the voltage drop, you need to know the properties of conductor material, current phase, load current, and initial voltage. This post covers 8 free voltage drop calculators. You can visit any of these calculators online and calculate the voltage drop of an electrical system.

## My Favorite Online Voltage Drop Calculator

OmniCalculator is my favorite voltage drop calculator on this list. First of all, this calculator explains voltage drop very nicely in simple terms. It also provides related terms and formulas. Coming to the calculator part, it is clean and quite simple to use. When you add your data, it instantly calculates the voltage drop. It has an advance mode to calculate the voltage drop for multiple conductors.

You can check out our lists of best free Online Watt Calculator Websites, Online Electricity Cost Calculator Websites, and Online Hydroelectric Power Calculator Websites.

## OmniCalculator.com OmniCalculaor has a free online voltage drop calculator. This calculator can help you find the voltage drop for electricity transfer over a distance. It can determine the voltage loss for the DC phase, AC single-phase, and AC three-phase. All you have to do is enter the wire specification along with the initial voltage and load current. This calculator also has an advance mode. Switching to this mode adds two additional input parameters; the number of conductors and wire cr0ss-section. Thus, if those parameters are needed, you can factor them as well.

### How to calculate voltage drop on OmniCalculator?

• Open the Voltage Drop Calculator on the OmniCalculator website using the link given below.
• Select the phase, wire material, and fill the required data into the calculator.
• Doing that instantly shows the voltage drop along with other relevant parameters.

### Highlights:

• Phase Supported: DC, AC single-phase, and AC three-phase.
• Input Parameters: Phase, Wire Material, Wire Size, Wire Length, Initial Voltage, and Load Current.
• Output Parameters: Voltage Drop, Voltage Drop Percentage, and Voltage at the end.
• Additional Parameters: Advance mode to factor in conductors and wire cross-section area.
• Share/Download: Option to share the calculator along with the filled input and resulting output.

## Calculator.net Calculator.net offers a free online voltage drop calculator. This calculator has three tabs to calculate the voltage drop of an electrical system. The “NEC data” tab calculates based on the resistance and reactance data from the NEC. The “Estimated resistance” tab calculates based on the resistance data estimated from the wire size. Lastly, the “Other” tab can be used to customize resistance or impedance data.

### How to calculate voltage drop on Calculator.net?

• Go to this Voltage Drop Calculator using the link given below.
• Select the NEC Data section in the calculator.
• Then insert the required parameters of voltage and wire into the calculator.
• Click the Calculate button to get the voltage drop.

### Highlights:

• Phase Supported: DC, AC single-phase, and AC three-phase.
• Input Parameters: Wire Material, Wire Size, Material of Conduit, Power Factor, Voltage, Phase, Number of Conductors, Distance, Load Current, Estimated Resistance, etc.
• Output Parameters: Voltage Drop, Voltage Drop Percentage, and Voltage at the end.

## Southwire.com Southwire offers a free voltage drop calculator that you can use. This calculator can help you determine three important parameters of an electrical system; Voltage Drop, Minimum Conductor Size, and Maximum Circuit. The process of finding the voltage drop is quite simple to follow. Simply select the system parameters and add your data. When you do that, it shows you the voltage drop of the system along with Amps Rated ampacity of the selected conductor, Resistance, Reactance, and Power Factor.

### How to calculate voltage drop on Southwire?

• Use the link provided below to open this Voltage Drop Calculator.
• Go to Input Parameters and select Voltage Drop Calculator.
• Add your data to the calculator and click the Calculate button to get the results.

### Highlights:

• Phase Supported: DC and AC single-phase only.
• Input Parameters: Temperature, Wire Material, Wire Size, Conductors, Length, etc.
• Output Parameters: Voltage Drop, Resistance, Reactance, and Power Factor.
• Additional Options: Minimum Conductor Size Calculator and Maximum Circuit Calculator.

## RapidTables.com RapidTables has a free online voltage drop calculator. This calculator can help you estimate the wire resistance and find out the potential voltage drop of the electrical system. It is quite simple to use. You start with selecting the material of the wire along with other wire parameters. Then you have to select the current phase, load, initial voltage, etc. Based on that, it gives you the voltage drop. With that voltage drop, it estimates the wire resistance as well.

### How to calculate voltage drop on RapidTables?

• Use the link given below to open this Voltage Drop Calculator.
• Select the current phase and wire material, and fill the required data into the calculator.
• Then click the Calculate button to get the results.

### Highlights:

• Phase Supported: DC, AC single-phase, and AC three-phase.
• Input Parameters: Wire Type, Resistivity, Wire Diameter, Wire Length, Current Phase, Voltage, and Current in amps.
• Output Parameters: Voltage Drop, Voltage Drop Percentage, and Wire Resistance.

## jCalc.net jCalc is another free website with an online voltage drop calculator. This calculator offers a multi-purpose calculator to find voltage drop, minimum cable size, and maximum cable size. The voltage drop calculator is simple to use. You can just add the parameters and get the voltage drop. Along with that, it also finds the cable resistance, reactance, impedance, etc.

### How to calculate voltage drop on jCalc?

• Follow the link given below to open this Voltage Drop Calculator.
• Select Voltage Drop for calculation and add the required parameters.
• Then click the Calculate button to get the results.

### Highlights:

• Phase Supported: DC, AC single-phase, and AC three-phase.
• Input Parameters: Voltage, Load, Cable Size, and Distance.
• Output Parameters: Voltage Drop, Voltage Drop Percentage, Wire Resistance, Reactance, Impedance, etc.

## Photovoltaic-Software.com Photovoltaic-Software is another free website with an online voltage drop calculator. This is a combination of three calculators; AC Power, Voltage Drop, and AC Energy Loss. Some parameters among these calculators are common. From there, you can use the Voltage Drop calculator to find the amount of voltage that will be lost over a given distance.

### How to calculate voltage drop on Photovoltaic-Software?

• Use the link provided below to open this Voltage Drop Calculator.
• Use the AC Voltage Drop calculator and insert your data.
• Then click the Calculate button to get the results.

### Highlights:

• Phase Supported: AC single-phase and AC three-phase.
• Input Parameters: Wire Material, Wire Size, Temperature, and Length.
• Output Parameters: Voltage Drop, Voltage Drop Percentage.

## Grealpha.com Grealpha offers a set of three calculators including the Voltage Drop Calculator, Suitable Wire Gauge, and Maximum Circuit Calculator. The Voltage Drop Calculator here is different than others. It finds the voltage drop from Wire Length, Wire Gauge, Source Voltage, and Load Current. As soon as you insert the values of all four parameters, it instantly shows the voltage drop along with the voltage drop percentage.

### How to calculate voltage drop on Grealpha?

• Go to this Voltage Drop Calculator using the link provided below.
• Select the Voltage Drop calculator on the website and insert the values of the required parameters.
• When you do that it instantly gives you the voltage drop of the system.

### Highlights:

• Phase Supported: DC and AC single-phase only.
• Input Parameters: Wire Length, Wire Gauge, Source Voltage, and Load Current.
• Output Parameters: Voltage Drop and Voltage Drop Percentage.
• Additional Options: Suitable Wire Gauge and Maximum Circuit Calculator.

## InchCalculator.com InchCalculator is yet another website to calculate the voltage drop of an electrical system. This voltage drop calculator estimates the voltage drop of an electrical system using conductor and circuit parameters. Based on the parameters it finds the voltage drop along with conductor diameter and cross-section area. There are two other calculators that you get on the same web page. With those calculators, you can find Minimum Conductor Size and Maximum Circuit Length.

### How to calculate voltage drop on InchCalculator?

• Select the Gauge, Wire Type, and insert other required parameters.
• Select the Voltage Drop calculator on the website and insert the values of the required parameters.
• When you do that it instantly gives you the voltage drop of the system.

### Highlights:

• Phase Supported: DC, AC single-phase, and AC three-phase.
• Input Parameters: Wire Length, Wire Gauge, Phase, Source Voltage, and Load Current.
• Output Parameters: Voltage Drop, Conductor Diameter, and Cross-section Area.
• Additional Options: Minimum Conductor Size Calculator and Maximum Circuit Calculator.
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