Enter the current weight of the tractor and the total horsepower into the calculator to determine the ballast weight.

Ballast Weight Calculator

Practical ballast answers first: counterweight for loader or rear implements, tire fluid by size, plus advanced axle-balance targets.

Loader / Implement
Tire Ballast
Advanced Axle Balance
Start here for a practical answer. Use this tab to estimate the rear ballast needed for a front loader or the front ballast needed for a rear implement.
This auto-fills if left blank.
Use this for tire ballast intent. Pick a tire size or enter your own liquid capacity, then estimate gallons plus added weight by fill percent and fluid type.
Advanced mode for users who already know horsepower plus current axle weights. This estimates target total weight, target axle split, plus ballast to add or remove.
This auto-fills if left blank.

Ballast Weight Formula

The following formula is a common rule-of-thumb to estimate the ballast to add (or remove) to reach a target operating weight. The target weight-per-horsepower factor varies by tractor type and application.

BW = (C*HP) - TW
  • Where BW is the ballast weight to add (lbs)
  • C is the target total weight per horsepower (lb/hp). Typical starting ranges for field/drawbar work are about 110–130 (2WD), 85–110 (MFWD), and 75–95 (4WD/Articulated).
  • HP is the tractor’s engine or PTO horsepower (hp)
  • TW is the current tractor weight without the ballast you’re sizing (lbs)

To calculate the ballast weight, multiply the horsepower by your chosen target weight-per-horsepower factor (C), then subtract the current weight of the tractor (without the ballast you’re sizing).

What is a ballast weight?

Definition:

A ballast weight is something, typically a piece of metal or another solid block of material, that adds weight to a vehicle in order to alter the handling or performance of the vehicle.

In the case of a tractor, it's normally used to help provide better traction when moving.

How to calculate ballast weight?

Example Problem:

The following example outlines how to calculate a ballast weight for a tractor.

First, determine the total horsepower of the tractor. In this example, the tractor has a 300 horsepower engine.

Next, determine the current weight of the tractor. This tractor weighs 25,000 lbs.

Finally, calculate the ballast weight using the formula above (using an assumed target factor of C = 110 lb/hp):

BW = (C*HP) - TW

BW = (110*300) - 25000

BW = 8,000 lbs