Voltage Drop Calculator

Calculate voltage drop in electrical wiring. Use this free browser-based voltage drop calculator from XTRAW Tools.

Voltage Drop Calculator helps you calculate voltage drop in electrical wiring. Use this free browser-based calculator from XTRAW Tools to compare inputs, estimate results, and plan your next step.

How to Use the Voltage Drop 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

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

Source Voltage: 120 V
Current: 20 A
One-Way Wire Length: 100 ft
Wire Gauge: 12 AWG

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.

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

Formula or Method

Vdrop = I × 2L × R/1000; Drop% = Vdrop / V × 100.

Example

Example inputs: Source Voltage: 120 V; Current: 20 A; One-Way Wire Length: 100 ft; Wire Gauge: 12 AWG

Example result: Using the default inputs and approximate 12 AWG resistance, voltage drop is about 6.35 V, or 5.29%.

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Voltage Drop Calculator FAQ

Is the Voltage Drop 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.