Bridge Formula Calculator
Calculate maximum legal weight by axle spacing using Federal Bridge Formula B.
Inputs
ft
lbs
Results
Bridge Formula Max Weight
79,875 lbs
Effective Limit
79,875 lbs
Compliance StatusLegal
Weight per Axle15,000 lbs
Over/Under Limit-4,875 lbs
% of Limit93.9%
Available Capacity4,875 lbs
Min Spacing for Weight44 ft
How to Use This Calculator
- Enter the Number of Axles in the axle group being evaluated.
- Set the Outer Axle Spacing in feet (distance from first to last axle in the group).
- Enter the Actual Weight on the axle group in lbs.
- Review the Bridge Formula Max Weight, Compliance Status (legal or over), and Over/Under Limit.
- If over the limit, check the Minimum Spacing for Weight to see what axle spread would make the load legal.
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