18 Best Free Online Wire Size Calculator Websites

Here is a list of the best free online wire size calculator websites. Wire size is the thickness of a wire. The amount of current a wire can carry directly depends on the size of that wire. The thicker the wire the more load it can take. There are two common ways to measure the wire size; wire gauge and wire cross-section area. Wire gauge is the thickness of the wire. It is measured in AWG (American Wire Gauge) and used in the USA. On the other hand, the wire cross-section area is just the area of wire calculated from wire radium/diameter. The cross-section area is used to measure wire size in the UK and other parts of the world.

A wire size calculator is a tool that determines the size of the wire you need for a particular electrical circuit. The wire size you need depends on various factors such as source voltage, current, distance, wire material, number of phases, insulation, etc. This post covers 18 websites with online wire size calculators. Some of these calculators have similarities whereas some are quite different. For example, there is a calculator that can help you with boat wiring. I briefly covered each calculator and tried to list its specifications. You can go through the post to check these out yourself.

My Favorite Online Wire Size Calculator

WireSizeCalculator.net is my favorite website on this list to calculate wire size online. This website has a simple yet very functional wire size calculator. It works for single-phase and three-phase AC/DC electrical systems with options to configure voltage drop, insulation, installation, etc. Along with the wire size, it also shows how much voltage you would get at the other end considering the max dropdown.

You can also check out our other lists of the best free online Electricity Cost Calculator Websites, online Hydroelectric Power Calculator Websites, and online AC Electricity Bill Calculator Websites.

WireSizeCalculator.net

WireSizeCalculator is a free website to calculate wire size for various needs. This website provides over a dozen of calculators to wire size calculation. It starts with the default calculator on the home page. The calculator can help you determine the wire size needed for specific circuit implementation. The calculator supports a single-phase as well as a three-phase electrical system. It works for raceway, cable, open-air, and buried-in Earth circuit installation methods. You can pick a method as per your circuit and pick the wire material (copper or aluminum). Then you can input electrical parameters for the circuit covering voltage, current, distance, insulation temperature, distance, and voltage drop. In the results, you get the wire size in AWG. Along with that, this calculator also shows how much voltage you would get at the other end at maximum voltage drop.

Calculator Specifications:

Electrical System: Single-Phase and Three-Phase systems.
Conductor Materials: Copper and Aluminum.
Insulation: 60°, 75° & 90° C.
Electrical Circuit Installation: Raceway, Cable, Open Air & Buried in Earth.
Input Parameters: Source Voltage, Current, One-way Distance, Insulation Temperature, and Allowable Voltage Drop.
Output: Wire Gauge with Voltage at a max drop.

Home Page

jCalc.net

jCalc.net offers a free online Wire Sizing Calculator. This calculator calculates the AWG wire size of wires according to the National Electricity Code (NEC) in the USA. It works for AC Single-Phase and AC Three-Phase systems. You can pick the circuit installation and add the input parameters including voltage, load (current), voltage drop, distance, insulation, etc. This calculator also takes the number of conductors and parallel conductors as input. Along with that, short circuit current and time. With that, it gives you the wire size that you should ideally use. Depending on the load and short circuit info, it recommends how many cables to use and of what size. It also generates an NEC Table covering different cable sizes with respective voltage drop, fault rating, and rating.

Calculator Specifications:

Electrical System: AC Single-Phase and AC Three-Phase systems.
Conductor Materials: N/A.
Insulation: 75° (PVC) & 90° (XLPE).
Electrical Circuit Installation: Raceway, Cable, Open Air & Buried in Earth.
Input Parameters: Source Voltage, Current, One-way Distance, Insulation Temperature, Voltage Drop, No. of Conductors, etc.
Output: Wire Gauge with NEC Table and Cable Recommendation.

Home Page

OmniCalculator.com

OmniCalculator is a popular website with a collection of calculators for almost every need. Under its Physics calculators collection, it offers a free online Wire Size Calculator. This is a versatile calculator that you can use for AC, DC, 12V, Low-voltage, and more. You can pick the electrical system and then add the parameters such as source voltage, current, distance, temperature, and accepted voltage drop. Based on that, it tells you what wire size would be a good fit. It gives you the wire gauge along with wire diameter, and wire cross-section area.

Calculator Specifications:

Electrical System: AC/DC Single-Phase and DC Three-Phase.
Conductor Materials: Copper and Aluminum.
Insulation: Add the temperature value directly.
Input Parameters: Source Voltage, Current, One-way Distance, Max. Wire Temperature, and Allowable Voltage Drop.
Output: Wire Gauge, Wire Diameter, and Wire Cross-section Area.

Home Page

CalcTool.org

CalcTool is a free website with a collection of online Physics calculators. The user interface of this website is similar to OmniCalculator. In fact, this online Wire Size Calculator is identical to what you get on OmniCalculator. It supports AC and DC electric systems. You can add source voltage, current, distance, temperature, and voltage drop. You can also select the wire material to factor into the calculation. With that, you get the wire size along with the diameter, cross-section area, and wire gauge.

Calculator Specifications:

Electrical System: AC/DC Single-Phase and DC Three-Phase.
Conductor Materials: Copper and Aluminum.
Insulation: Add the temperature value directly.
Input Parameters: Source Voltage, Current, One-way Distance, Max. Wire Temperature, and Allowable Voltage Drop.
Output: Wire Gauge, Wire Diameter, and Wire Cross-section Area.

Home Page

ZaniboniLighting.com

ZaniboniLighting.com is a free website that offers a free wire size calculator. Instead of giving you a wire size, this calculator generates a wire gauge table. This calculator has 6 presets of voltage. You can pick voltage as per your circuit and add the circuit load and wire length. Then you also get an option to set the percentage drop if needed. With all these parameters, this calculator generates a long wire gauge table. The table lists all the wire sizes that you can use for the circuit. It shows the end voltage you would get with each listed wire along with the maximum length of the wire. If you already have spare wires, you can use that calculator to see how that would work for your circuit.

Calculator Specifications:

Electrical System: N/A.
Conductor Materials: N/A.
Insulation: N/A.
Input Parameters: Source Voltage, Current, Wire Length, and Voltage Drop.
Output: Wire Gauge Table.

Home Page

FabHabs.com

FabHabs.com has a free online DC Cable Size Calculator. This is a simple calculator where you can add the input parameters to get the wire size. It works for the DC voltage. You can start by adding the DC source voltage along with current, cable length, and voltage drop. With that, it shows you the wire size you would need. It shows the wire size in gauge (AWG) as well as the wire cross-section area (mm²).

Calculator Specifications:

Electrical System: DC system.
Conductor Materials: N/A.
Insulation: N/A.
Electrical Circuit Installation: Cable.
Input Parameters: System Voltage, Current, Cable Length, and Voltage Drop.
Output: Wire Gauge and Cross-section area.

Home Page

ElectricalTechnology.org

ElectricalTechnology.org offers an online wire size calculator that calculates the wire gauge you need for your electrical system. This calculator works for both, AC and DC, systems with single-phase and three-phase configurations. You can select these parameters as per your system and add the source voltage, current, distance, and voltage drop. In the output, it shows you the wire size you need. It uses AWG for measurement and shows the wire gauge for both copper wire and aluminum wire.

Calculator Specifications:

Electrical System: Single-Phase and Three-Phase AC/SC systems.
Conductor Materials: Copper and Aluminum.
Insulation: N/A.
Input Parameters: Source Voltage, No. of Phases, Current, One-way Distance, and Allowable Voltage Drop.
Output: Wire Gauge for copper wire and aluminum wire.

Home Page

Apogeeweb.net

Apogeeweb.net is another website with a free online wire size calculator. It makes it easy to determine the correct wire size for your requirements. The calculator supports single-phase and three-phase electrical systems. There are two wire material options to choose from; Copper and Aluminium. It has a collection of commonly used voltage presets that you can select as per your needs. After that, with the value of load and distance, you can determine the wire size. It shows the wire size in AWG. Do note that, this calculator does not have an option to include the voltage drop in the calculation.

Calculator Specifications:

Electrical System: Single-Phase and Three-Phase AC/DC systems.
Conductor Materials: Copper and Aluminum.
Insulation: N/A.
Input Parameters: Source Voltage, No. of Phases, Current, and One-way Distance.
Output: Wire Gauge.

Home Page

PaigeWire.com

PaigeWire.com has a free online wire size calculator that you can use to estimate the wire size required for your needs. This is a simple-to-use calculator that works for single-phase and three-phase systems. All you have to do is select the source voltage along with the number of phases, current, distance, and allowable voltage drop. With that input, this calculator determines the wire size in AWG. It shows two wire gauge values; one for copper wire and one for aluminum wire.

Calculator Specifications:

Electrical System: Single-Phase and Three-Phase AC/DC systems.
Conductor Materials: Copper and Aluminum.
Insulation: N/A.
Input Parameters: Source Voltage, No. of Phases, Current, Voltage Drop, and One-way Distance.
Output: Wire Gauge for Copper wire and Aluminum wire.

Home Page

WireBarn.com

WireBarn.com is another free website with a wire calculator. This calculator generates a wire gauge table in the output. You can select the voltage, add current, wire length, and voltage drop. Do note that, this calculator only has a preset voltage ranging from 6V to 24V. In the output, the table consists of a list of various wire sizes. Based on the calculations, it checks the wire size that can be used in your particular circuit. Along with that, it also you the end voltage you would get with each suitable wire size. It also shows the max length for every listed wire size.

Calculator Specifications:

Electrical System: N/A.
Conductor Materials: N/A.
Insulation: N/A.
Input Parameters: Source Voltage, Current, Wire Length, and Voltage Drop.
Output: Wire Gauge Table.

Home Page

AskMeDIY.com

AskMeDIY.com is a free website with an online wire size calculator. This calculator works for 120, 208, 240, 277, and 480V source voltage. You have to pick a voltage from these as there is no option to enter a voltage value. It works for single-phase and three-phase systems. You can pick the wire material from copper and aluminum. Then you can simply add the load and allowable voltage drops to get the wire gauge.

Calculator Specifications:

Electrical System: Single-Phase and Three-Phase AC/DC systems.
Conductor Materials: Copper and Aluminum.
Insulation: N/A.
Input Parameters: Source Voltage, No. of Phases, Current, Voltage Drop, and One-way Distance.
Output: Wire Gauge.

Home Page

CSGNetwork.com

CSGNetwork.com has a free online wire size calculator. You can use this calculator to determine the size of the conductor wire in a circuit. To do that, you have to add the circuit load (current), half of the total length of the circuit, circuit voltage, circuit phase, and wire material. With that, it gives you the wire size in AWG. Do note that, this calculator has four pre-defined voltage values and does not let you add a custom voltage. Also, it does not have an option to add a voltage drop.

Calculator Specifications:

Electrical System: Single-Phase and Three-Phase AC/DC systems.
Conductor Materials: Copper and Aluminum.
Insulation: N/A.
Input Parameters: Source Voltage, No. of Phases, Current, and One-way Distance.
Output: Wire Gauge.

Home Page

EasyCalculation.com

EasyCalculation is another popular website that offers online calculators for Physics, Math, Chemistry, Science, Biology, Finance, Health, and more. It has a free Cable Size Calculator that you can use to determine the wire/cable size you would need for an electrical system. To do that, you can pick the source voltage from 140V, 240V, and 480V. There are only these three options for that. Then you can pick the number of phases and enter the current, distance, and voltage drop. With those parameters, this calculator gives you the wire gauge in the results. It shows the sizes you need if you use copper wire or aluminum wire.

Calculator Specifications:

Electrical System: Single-Phase and Three-Phase AC/DC systems.
Conductor Materials: Copper and Aluminum.
Insulation: N/A.
Input Parameters: Source Voltage, No. of Phases, Current, and One-way Distance.
Output: Wire Gauge for Copper wire and Aluminium wire.

Home Page

BoatHowTo.com

BoatHowTo.com offers free online wire size calculators for boats. It has two different calculators to calculate wire size; ABYC Wire Size Calculator and ISO Wire Size Calculator. The ABYC calculator gives you the wire size according to American Wire Gauge (AWG) system. Whereas, the ISO calculator uses the metric system and gives you the required cross-section area of the conductor in millimeters. You can use any of the calculators to find out the wire size you should use. If you want to carry the AC current then you should use the ABYC calculator as the ISO calculator does not have that option.

Calculator Specifications:

Electrical System: AC and DC.
Conductor Materials: N/A.
Insulation: 60°, 75°, 80°, 90°, 105°, 125° & 200° C.
Electrical Circuit Installation: Cable.
Input Parameters: System Voltage, Current, Cable Distance, Insulation Temperature, Voltage Drop, No. of Conductors, etc.
Output: Wire Gauge or Cross-section area.

Home Page

Explorist.life

Explorist.life is a free wire-size calculator for campers. You can use this calculator to determine what wire size you should use in your camping vehicle. To do that, you have to provide the current (Amps), voltage, cable length, and voltage drop. Along with that, you can also opt-in for wiring in the engine compartment. With that, it recommends the appropriate wire size for your project. Apart from that, you also get an option to get fuse sizing recommendations.

Calculator Specifications:

Electrical System: N/A.
Conductor Materials: N/A.
Insulation: N/A.
Electrical Circuit Installation: Cable.
Input Parameters: System Voltage, Current, Cable Length, and Voltage Drop.
Output: Wire Gauge and Fuse Sizing Recommendations.

Home Page

Solar-Wind.co.uk

Solar-Wind.co.uk offers a simple wire size calculator that you can use online. This calculator recommends the wire size based on the various parameters of your electrical circuit. You can start by picking the voltage drop and then enter values of source voltage, current, and wire length. In the output, you get the wire size that you should use. This calculator shows the wire size in AWG and cross-section area.

Calculator Specifications:

Electrical System: N/A.
Conductor Materials: N/A.
Insulation: N/A.
Input Parameters: Source Voltage, Current, Cable Length, and Voltage Drop.
Output: Wire Gauge and Cross-section Area.

Home Page

InsulatedCables.co.in

InsulatedCables.co.in offers a free online wire size calculator. This calculator works for single-phase as well as three-phase systems. However, instead of voltage, you have to input power here. You have to enter the power of your circuit in KiloWatts. Along with that, you can select the phase, voltage drop add cable length. The calculator automatically picks the current based on the power. Then you can simply run the calculator to get the wire size. In the output, it lists all the added parameters along with the cross-section area of the wire that you would need.

Calculator Specifications:

Electrical System: Single-Phase and Three-Phase AC/DC systems.
Conductor Materials: N/A.
Insulation: N/A.
Input Parameters: Power, Current, Cable Run, and Voltage Drop.
Output: Wire cross-section area.

Home Page

ElectricScooterParts.com

ElectricScooterParts.com is yet another free website to calculate the wire size online. This website has a simple calculator where you can determine the wire size for your electrical system with a voltage drop of choice. To do that, you have to add the source voltage, current, and wire length used in the electrical system. Along with that, you can also pick the voltage drop. With that, this calculator gives you the ideal wire size to be used for your system. It shows the wire size in AWG as well as by cross-section area. So no matter where you are, you can easily find the suitable wire for your circuit.