Wire Length Calculator
Calculate Wire Length
Formula
Total = (outlets × avg distance × (1 + slack%/100)) + (outlets × 1 ft connection). Rolls = ceil(total / 250).
Frequently Asked Questions
How much extra wire should I buy?
A 10-15% slack allowance is standard to account for routing around obstacles, through walls, and for termination. Add 1 foot per connection point.
How many feet are in a standard roll of wire?
Residential electrical wire is commonly sold in 250-foot rolls (boxes). Larger 1,000-foot spools are also available for bigger projects.
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