BoxFillCalculator.com vs Mike Holt

Definitions and review context

A box fill calculator is a digital tool that converts conductor counts, device counts, grounding allowances, and fittings into a cubic-inch compliance check. The table below compares resource types and access methods for Mike Holt and BoxFillCalculator.com.

Box fill refers to the enclosure-volume accounting method in NEC 314.16. The practical difference between calculators is rarely just the final number; it is whether the tool shows the assumptions behind that number, including how it treats internal clamps, device yokes, grounding conductors, and conductor size selection.

Author: Jack Shi is the editor of Box Fill Calculator. He researches each guide against the published text of NEC Article 314.16 and cross-checks every conductor-count and box-volume figure so the guidance stays accurate and practical for electricians, inspectors, and DIY installers.

• National Electrical Code for the governing box-fill rules.
• Junction box for the physical enclosure problem calculators are modeling.
• American wire gauge for conductor-size references that change allowance values.