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Wildfire Equipment Research & Development


Roscommon Equipment Center





Below, you will find a basic calculator for estimating the water tank size that a medium duty truck can handle.  This is only an estimate.  This tool may help you choose a chassis by providing a starting point prior to preparing more refined calculations.  Some things that will affect the accuracy of this calculator include:

A more reliable tank capacity estimate is possible for these vehicles.  REC’s Detailed Calculator - Truck Chassis > 14,000 GVWR can be used for a more accurate estimate.  It is strongly suggested that you consider using the lower end of the range given.  The high end of the range is possible if lightweight materials are used and storage is kept to a minimum.

Remember to weigh the finished vehicle, fully loaded and ready for operation prior to placing the unit into service.  Make sure that the finished vehicle does not exceed the manufacturer’s Gross Vehicle Weight Rating or the ratings for either axle.

Read REC’s Newsnote #3 - Guidelines for Designing Wildland Fire Engines for additional information.

BASIC CALCULATOR - TRUCK CHASSIS > 14,000 GVWR


Enter the vehicle's GVWR as given by the manufacturer: lbs.
Enter the weight of chassis or truck prior to adding tank, pump, and fire accessories: lbs.

Expect tank size to range from to gallons of water.