Wire Size Calculator

Determine a wire gauge estimate from current, distance, voltage, and voltage drop limit. Use this free browser-based wire size calculator from XTRAW Tools.

Wire Size Calculator helps you determine a wire gauge estimate from current, distance, voltage, and voltage drop limit. Use this free browser-based calculator from XTRAW Tools to compare inputs, estimate results, and plan your next step.

How to Use the Wire Size Calculator

Enter the required calculator inputs shown in the form.
Review the measurements, electrical values, grades, weights, rates, or reading assumptions.
Run the calculator, then adjust one input at a time to compare scenarios or check your work.

What This Calculator Helps With

Determine a wire gauge estimate from current, distance, voltage, and voltage drop limit. It is designed for electricians, engineers, contractors, students, and people planning electrical wiring estimates who want a fast, browser-based estimate before relying on a contractor, electrician, engineer, code authority, teacher, advisor, or professional source.

Current: 20 A
One-Way Distance: 75 ft
System Voltage: 120 V
Max Voltage Drop: 3%

Common Uses

People use this calculator when they need a quick way to estimate construction materials, electrical values, solar sizing, school grades, GPA, or reading time from real inputs.

Material Estimating: Estimate quantities, coverage, materials, and project needs before ordering supplies.
Project Planning: Compare project assumptions, academic goals, energy plans, or electrical scenarios.
Measurement: Use measurements, grades, electrical values, or reading values to get a clear result.

Formula or Method

Selects the smallest AWG with adequate ampacity and voltage drop at or below the selected maximum.

Example

Example inputs: Current: 20 A; One-Way Distance: 75 ft; System Voltage: 120 V; Max Voltage Drop: 3%

Example result: Using the default inputs, the calculator estimates a wire gauge that meets current and voltage drop assumptions.

Related Tools

Wire Size Calculator FAQ

Is the Wire Size Calculator free?

Yes. This calculator is free to use on XTRAW Tools.

Do I need to create an account?

No. XTRAW tools are designed for browser-based use without requiring an account.

Are the results exact?

Results may be estimates depending on the inputs, formula, rounding, assumptions, and purpose of the calculator. Always verify important results before relying on them.

Disclaimer: This calculator is provided for general informational, educational, and convenience purposes only. It is not legal, financial, medical, tax, engineering, electrical, construction, solar, academic, safety, or professional advice. Always verify important results with a qualified professional, instructor, code authority, manufacturer documentation, or authoritative source before making decisions.