RV Weight Margin Checker

Updated October 23, 2026.

How it works

For every rating where you enter both the rating and the matching weight, the checker does the same three steps:

1. Remaining = rating − measured weight, in pounds.
2. Share of the rating = remaining ÷ rating × 100.
3. Flag: a negative remainder is over; a remainder below your caution band is caution; anything else is pass.

What each rating is. GVWR is the most the manufacturer says a vehicle or trailer may weigh fully loaded. GAWR is the most it says one axle, or axle group, may carry. GCWR is the most it says a tow vehicle and trailer may weigh together. Tongue weight, or pin weight on a fifth wheel or gooseneck, is the downward load the trailer puts on the hitch, and the hitch has its own rating. Payload is the manufacturer’s stated capacity for passengers, cargo and, depending on how they define it, hitch load. On a tow vehicle, tongue or pin weight commonly counts against payload, so ask the manufacturer how it counts.

Every number is yours. The tool has no built-in ratings and does not look anything up. Read ratings from your own labels, manuals and hitch parts, and take weights from a scale ticket. Some scales report one reading for the whole unit and others report each axle group, so ask the scale operator how to get the readings you need, and weigh again after you change the load. Fuel, water, propane and gear all move the numbers.

Over a rating is a safety and legal issue. A rating is the manufacturer’s limit for the design, and exceeding it can affect braking, steering, tire load and stability, and can have legal consequences in some places. A pass here is only as good as the numbers you typed. The towing weight ratings and GVWR guide explains how the ratings relate, and tires carry their own limits (see the tire pressure and blowouts guide). Verify anything safety-critical with the manufacturer before you travel.

Worked example

Suppose, with hypothetical numbers typed from imaginary labels and a scale ticket: GVWR 14,500 lb and a loaded weight of 13,900 lb; an axle rating of 7,000 lb against 7,200 lb on the heaviest axle; GCWR 24,000 lb against a combined 20,500 lb; a hitch rating of 1,200 lb against a measured tongue weight of 1,350 lb; and payload capacity of 2,100 lb with 1,500 lb carried. The caution band is left blank, so the tool’s own 10% applies.

GVWR: 14,500 − 13,900 = 600 lb, which is 4.1% of the rating, so caution. Axle: 7,000 − 7,200 = −200 lb, so over by 200 lb (2.9% above the rating). GCWR: 24,000 − 20,500 = 3,500 lb, 14.6% of the rating, so pass. Hitch: 1,200 − 1,350 = −150 lb, so over by 150 lb (12.5% above). Payload: 2,100 − 1,500 = 600 lb, 28.6% of the rating, so pass.

The overall line reads “Over a rating,” naming the axle and the hitch. That is the point of checking each rating separately: one rating can be over while the combined weight looks comfortable. These numbers are illustrative arithmetic, not data about any rig.