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
≈ 7 elephants
Effective Limit
79,875 lbs
≈ 7 elephants
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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