Federal Bridge Formula B & Commercial Axle Weight Solver
Model statutory Federal Highway Administration (FHWA) Bridge Gross Weight Formula B: W = 500 * [ (LN/(N-1)) + 12N + 36 ], Steer Axle limits, Drive Tandem (34k lbs), Trailer Tandem (34k lbs), and maximum 80,000 lbs Interstate Gross Vehicle Weight (GVW).
⚙️ Axle Geometry & Scale Weights
Scale Ticket Axle Weights (Lbs)
📊 Bridge Legal Limits & Compliance
Bridge Formula Legal Limit
80,000 Lbs
Actual Scale GVW
79,200 Lbs
DOT Status
✅ 100% Legal
Overweight
0 Lbs
Bridge Limit Calculated
Federal Bridge Formula B: Max 80,000 lbs for 5 axles over 51.0ft
Axle Weight Breakdown
Steer: 12k, Drive: 33.8k (Max: 34k), Trailer: 33.4k (Max: 34k)
Enforcement Compliance
Scale ticket is 100% DOT compliant for interstate freight routes.