FREE TOOL

Bridge Formula Calculator

Federal Bridge Formula B — instantly check if your axle configuration is legal. Replaces ugly government spreadsheets from 1998.

Quick Presets

Number of Axles

Axle Group Span (ft)

Actual Weight (lbs)

⚠️

Regulatory Disclaimer

This tool provides estimates for informational purposes only. Regulations change frequently. Always verify requirements with the relevant state, federal, or national authority before any move. Haul Command assumes no liability for decisions made based on these results.

Based on: Federal Bridge Formula (23 USC 127) · United States Federal

Requirements change. Check with local authorities for the most current information.