Truck Axle Weight Calculator
Enter your total weight, tractor weight, and steer weight to instantly estimate your drive axle and trailer axle weights.
Combined weights
Axle weights
| Axle type | Max weight |
|---|---|
| Steer axle | 20,000 lbs |
| Drive axle (tandem) | 34,000 lbs |
| Trailer axle (tandem) | 34,000 lbs |
Weight distribution
Calculate Your Truck’s Allowable Axle Weight
Understanding your semi-truck’s allowable weight distribution is vital for safe and efficient operation. Our easy-to-use Axle Weight Distribution Calculator assists truck owners and operators in estimating their steer axle, drive axle, and trailer axle weights.
Steer Axle
The front axle that controls steering. Federal limit is 20,000 lbs. Overloading damages steering components and reduces control.
= Your input
Drive Axle
The rear axle(s) that propel the tractor. Calculated by subtracting steer weight from tractor weight. Tandem limit is 34,000 lbs.
= Tractor − Steer
Trailer Axle
The axle(s) under the trailer. Calculated by subtracting tractor weight from total weight. Tandem limit is 34,000 lbs.
= Total − Tractor
Overloading any axle can result in fines, increased wear and tear on components, and safety hazards. Staying within manufacturer specifications and legal limits supports safer, more reliable operation on every haul.
What Is Axle Weight?
Axle weight refers to the weight distributed over a single axle (or the weight spread across consecutive axle groups) of a commercial vehicle. In a semi-trailer truck, weight is typically distributed among the steer axle (front axle), drive axle (rear axle), and trailer axle.
It’s important to note that this includes the truck’s gross vehicle weight plus the weight of the cargo. Overloading your axles can result in fines, increased wear and tear, and safety hazards.
Frequently Asked Questions
Use two quick subtractions. Drive Axle Weight = Tractor Weight − Steer Weight. Trailer Axle Weight = Total Weight − Tractor Weight. Gather accurate readings for total, tractor, and steer, then apply the formulas.
Axle weight is the load carried by a single axle or group of consecutive axles on a commercial vehicle. Gross vehicle weight is the total weight of the truck and trailer, including cargo. Axle weight focuses on distribution across axles, while gross vehicle weight is the overall sum.
Overloading an axle can result in fines, increased wear and tear on components, and serious safety hazards. Excessive axle weight damages suspension, tires, brakes, and the road surface itself. Staying within manufacturer specifications and legal limits supports safer, more reliable operation.
Yes, you can change the weight distribution of your truck by shifting or redistributing the load. Keep in mind that this should always be done in accordance with safety regulations, the manufacturer’s axle rating, and maximum legal weight limits.
Yes, you can use this calculator for other types of vehicles as long as you know the total weight and the axle weight limits. Just keep in mind that the results may not be as accurate for vehicles with significantly different weight distributions than semi-trucks.
Compliance doesn’t stop at the scale.
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This calculator provides estimates based on user-entered values and standard industry formulas. Results do not constitute engineering, legal, or regulatory advice. Always verify your vehicle’s actual axle weights at a certified scale and comply with all applicable federal, state, and local weight regulations. Fleetworthy is not liable for decisions made based on calculator output. Contact our team for fleet compliance support.