100 Amp Wire Size Calculator

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100 Amp Wire Size Calculator

Pick a copper or aluminium wire size for a 100 amp service or subpanel. Preliminary only, follow local code.

bolt Free Online Tool
⚡ Instant Results
📊 Clear Comparison
🔒 100% Free Tool
Wire size

Compare Your Options And Get Clear Answers

Pick a copper or aluminium wire size for a 100 amp service or subpanel. Preliminary only, follow local code.

100 Amp Wire Size Estimator

Enter your numbers below for an instant estimate.

Inputs
Breaker size
Conductor
One way
Service
0
💡 Tip: Conductor chosen from typical ampacity tables; voltage drop = 2 x resistivity x length x current / area.

How It Works

Key concepts behind this calculator

1

Enter Values

Fill in each field with your own numbers.

2

Calculate

Results update as you change the inputs.

3

Review

Read the breakdown and the explanation.

4

Adjust

Change values to compare scenarios.

Quick Reference Guide

100 Quick Guide

Typical values for reference.

LoadCopperAluminiumNote
bolt 60 A6 AWG copper4 AWG aluminiumTypical, check code
bolt 100 A1 AWG copper1/0 AWG aluminiumTypical, check code
bolt 125 A1/0 AWG copper2/0 AWG aluminiumTypical, check code
bolt 150 A2/0 AWG copper3/0 AWG aluminiumTypical, check code
📊 Rule of ThumbCheck inputsUse as a guideRound sensibly
Common Questions

100 Amp Wire Calculator FAQ

Answers to common questions about this calculator.

Typically 1 AWG copper or 1/0 aluminium by common tables, but local code applies.

Electrical work should be done by a licensed electrician.

Conductor chosen from typical ampacity tables; voltage drop = 2 x resistivity x length x current / area.

It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.

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