TONGUE WEIGHT CALCULATOR — THE NUMBER BEHIND MOST SWAY
Tongue Weight Calculator — Keep Your Trailer Setup Safe and Legal
Too little tongue weight and your trailer fishtails. Too much and your rear tyres lose traction. Know the number before you tow.
Enter your trailer’s gross weight. The calculator returns the ideal tongue weight range (10–15% of GTW) and checks it against your hitch and truck ratings.
Tongue weight that is too light is a recognised contributor to trailer sway. The 10 to 15 per cent guideline is trailer and hitch manufacturer guidance, not a legal requirement – no FMCSA rule sets a tongue weight percentage, and SAE J2807 is a tow-rating test procedure rather than a tongue weight standard.
Anyone towing a trailer, caravan, boat, or equipment with a rated hitch.
- Trailer and hitch manufacturer tongue weight guidance
- FMCSA towing safety standards
- NHTSA towing safety guidance
CALCULATOR
Disclaimer: This tool is provided for educational and informational purposes only and does not constitute legal, safety, or professional advice. Sunferno Automotive Accessories cannot verify how products are installed, used, or attached in your specific vehicle or situation — proper installation, use, and securement are solely the responsibility of the user. Laws and regulations vary by jurisdiction and change over time; always confirm current requirements with your local authorities or a qualified professional. Sunferno products must be used strictly in accordance with manufacturer instructions and applicable regulations.
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