Engineering Standards
Towing Safety Standards & Physics Methodology
TongueWeight.com is an open automotive safety utility developed to eliminate guesswork from trailer loading, prevent highway sway rollovers, and make accurate weight measurement accessible in any driveway.
SAE J2807 & DOT Trailering Standards
Calculations on this platform adhere strictly to published specifications from the Society of Automotive Engineers (SAE) and the National Highway Traffic Safety Administration (NHTSA):
- SAE J2807 Light Trailering Standards: Dictates that conventional bumper-pull combinations maintain between 10% and 15% tongue weight to ensure combination vehicle stability and pass standard dynamic slalom tests.
- Archimedes' Law of the Lever: The DIY bathroom scale method calculates exact mechanical leverage using moment-arm physics (ΣM = 0), allowing a standard 300 lb bathroom scale to safely weigh heavy 900+ lb tongues.
- Weight Distribution Thresholds: Flags combinations exceeding 500 lbs tongue weight where hitch manufacturers legally mandate weight distribution spring bars.
Deterministic Client-Side Execution
All calculations execute deterministically in your local browser runtime. Zero tracking cookies, zero remote data transmission, and instant performance on job sites and remote trailheads.