Truck Weight & Axle Calculator

Check weights against federal limits before you hit the scale. Avoid costly overweight violations.

What you enter

DispatchTool tracks cargo weights, alerts on potential overweight loads, and maintains compliance records.

Frequently Asked Questions

What is the max weight for a semi truck?

Federal law limits gross vehicle weight to 80,000 lbs on Interstate highways. Individual axle limits: single axle 20,000 lbs, tandem axle 34,000 lbs. The steer axle typically carries 12,000–13,000 lbs.

How do you calculate axle weight distribution?

Axle weight depends on trailer type, cargo placement, and fifth wheel position. Moving the fifth wheel forward shifts weight to drive axles; moving it back shifts weight to trailer axles. Each inch moves approximately 250-500 lbs.

What are bridge law weight limits?

The Federal Bridge Formula (Bridge Law) limits weight based on the number of axles and the distance between them. This prevents concentrated weight that damages bridges. Even if under 80,000 GVW, you can violate bridge law.

What are overweight fines?

Overweight fines vary by state but typically range from $1–$15 per pound over the limit. At $10/lb, being 2,000 lbs overweight costs $20,000. Some states impound the vehicle until weight is corrected.