Free vehicle tool
Towing Safety Calculator
Estimate loaded trailer weight, towing-capacity use, tongue weight, and vehicle payload margin with transparent math.
Frequently asked questions
What counts toward loaded trailer weight?
Start with trailer dry weight, then add cargo, water, propane, batteries, accessories, and anything else carried by the trailer.
Why does the calculator use 10–15% tongue weight?
Conventional bumper-pull trailers commonly need approximately 10–15% of loaded trailer weight on the hitch for stability. The correct target can differ by trailer and hitch.
Does tongue weight count against vehicle payload?
Yes. Tongue weight, passengers, cargo, and hitch hardware all consume the tow vehicle’s available payload.
Is staying under the tow rating enough?
No. Payload, GVWR, axle, tire, hitch, trailer, and combined-weight ratings can become limiting before the advertised tow rating.
Where should I verify my final limits?
Use the exact door-jamb certification label, tire label, hitch label, and owner’s manual for the vehicle and configuration being used.