Electrician needs to calculate hole centers for drilling knockouts on a junction box, lacking a simple tool to automate spacing given box width, hole size, and desired spacing.

Existing methods require manual math or trial-and-error, no quick calculator for knockout spacing patterns.

Severity

2Mild

Willingness to Pay

implied

Added

May 21, 2026

App Concept

KnockoutCalc Pro

A mobile app that instantly calculates optimal hole centers for electrical knockouts. Enter box width, hole diameter, number of holes, and desired spacing to get precise center measurements. Saves time and reduces errors compared to manual calculation.

Key Features

Enter box width, hole diameter, number of holes, and edge spacing to calculate centers
Support for multiple rows and offset patterns
Visual diagram with dimensions
Save preset configurations for common box sizes

Target Users: Electricians and electrical contractors in field service and construction, typically working with junction boxes up to 48 inches wide.

Revenue Model: Free version with limited presets, $4.99 one-time purchase for unlimited use, or $1.99/month subscription for pro features like multi-row layouts

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