Towing Capacity Calculator
Can your truck safely tow this trailer? Enter your vehicle and trailer specs below to get a clear safe/warning/danger result across all six critical safety checks. No sign-up required.
1Your Tow Vehicle
2Your Trailer
From trailer sticker
Gear, food, clothing
8.34 lbs/gallon
From trailer sticker
3Passengers & Cargo in Truck
~150-200 lbs per person
Tools, firewood, coolers
How This Towing Capacity Calculator Works
This calculator performs six independent safety checks based on SAE J2807 standards. Each check examines a different weight limit that could be exceeded when towing. Here's what each check means:
1. Towing Capacity Check
Compares your loaded trailer weight against the manufacturer's maximum tow rating. Green at 80% or below, yellow from 80-100%, red above 100%.
2. Payload Capacity Check
Adds up passengers, cargo, and tongue/pin weight and compares against your truck's payload rating. This is the most commonly exceeded limit and the #1 cause of towing accidents.
3. GVWR Check
Compares your loaded truck weight (curb weight + passengers + cargo + tongue weight) against the Gross Vehicle Weight Rating. Exceeding GVWR risks tire failure and brake issues.
4. GCWR Check
Compares the combined weight of your loaded truck and loaded trailer against the Gross Combined Weight Rating. Exceeding GCWR strains your engine, transmission, and braking system.
5. Tongue Weight Ratio Check
Verifies your tongue weight (travel trailer) or pin weight (fifth wheel) is within the optimal percentage range. Too low causes dangerous trailer sway; too much overloads your rear axle. Also checks against your hitch receiver rating.
6. Trailer GVWR Check
Compares your loaded trailer weight against the trailer's own GVWR (found on the trailer's VIN sticker). Overloading the trailer risks tire blowouts, axle failure, and frame damage. This check only appears if you enter a trailer GVWR.
Frequently Asked Questions
How is towing capacity calculated?
Towing capacity is set by the vehicle manufacturer based on the SAE J2807 standard. It represents the maximum weight your vehicle can safely pull. However, towing capacity alone is misleading. You also need to check payload capacity, GVWR, GCWR, tongue weight, and trailer GVWR. Our calculator checks all six simultaneously.
What is the 80% rule for towing?
The 80% rule is an industry best practice that recommends keeping your loaded trailer weight at or below 80% of your vehicle's maximum tow rating. This leaves a 20% safety buffer for wind, hills, emergency maneuvers, and weight estimation errors. Our calculator flags a warning when you exceed 80% of your tow rating.
Why is payload more important than towing capacity?
Payload capacity is often the first limit you'll exceed. Your truck's payload includes passengers, cargo, and tongue weight (or pin weight for fifth wheels). A half-ton truck with a 12,000 lb tow rating might only have 1,500 lbs of payload. Add 4 passengers (700 lbs), some firewood (200 lbs), and an 800 lb tongue weight, and you're over payload before you even start towing. This is the #1 mistake RV owners make.
Where do I find my vehicle's towing specs?
Check the sticker inside your driver's door jamb for GVWR and payload capacity. Your owner's manual or the manufacturer's towing guide has GCWR and tow rating by trim/engine/axle ratio configuration. You can also select your vehicle from our database to auto-fill these specs.
What's the difference between dry weight and loaded weight?
Dry weight (also called UVW or Unloaded Vehicle Weight) is the trailer's weight as it leaves the factory, without water, propane, battery, or cargo. Loaded weight adds all of these. A trailer with a 6,000 lb dry weight can easily weigh 9,000+ lbs when fully loaded. Always calculate using loaded weight, not dry weight.
Do I need a weight distribution hitch (WDH)?
Generally, if your trailer weighs more than 5,000 lbs or your tongue weight exceeds 500 lbs, a weight distribution hitch is recommended. A WDH distributes tongue weight across all axles of the tow vehicle and trailer, improving stability and steering control. Some manufacturers require a WDH above certain trailer weights to maintain the tow rating.