An RV towing calculator checks whether your tow vehicle can safely pull a trailer or RV by comparing vehicle specs against trailer weight. Enter your vehicle's towing capacity, payload capacity, and curb weight along with your trailer's gross weight and tongue weight to get instant pass/fail safety checks and capacity usage bars.
Tow Vehicle
Vehicle weight empty with full fuel tank
Gross Vehicle Weight Rating — max loaded vehicle weight
Maximum trailer weight your vehicle can tow
GVWR minus curb weight — max passengers, cargo, and tongue weight
Gross Combined Weight Rating — max vehicle + trailer weight
Trailer / RV
Trailer weight empty (UVW / dry weight)
Gear, water, food, and other cargo in the trailer
Downward force on the hitch — should be 10-15% of trailer gross weight
Weight of people and cargo inside the tow vehicle
Safety Checks
Capacity Usage
Safety Warnings
Weight Summary
How to Use the RV Towing Calculator
Towing a trailer or RV beyond your vehicle's rated limits is one of the most dangerous things you can do on the road. Overloaded tow vehicles experience longer stopping distances, reduced steering control, overheating transmissions, and catastrophic brake failure. This RV towing calculator runs every critical safety check in seconds so you can tow with confidence.
Step 1: Enter Your Tow Vehicle Specs
Start with your vehicle's curb weight, GVWR (Gross Vehicle Weight Rating), maximum towing capacity, and payload capacity. Find these numbers in your owner's manual, on the sticker inside the driver's door jamb, or on the manufacturer's website. Make sure you use the specs for your exact trim level and engine configuration, since towing capacity varies significantly between trims.
Step 2: Enter Your Trailer Specs
Enter the trailer's dry weight (also called UVW or unloaded vehicle weight), plus any cargo you plan to load into the trailer such as water, food, gear, and supplies. Then enter the tongue weight, which is the downward force the trailer coupler puts on your hitch ball. If you do not know the tongue weight, a common rule of thumb is 10-15% of the total trailer weight for conventional trailers and 15-25% for fifth wheels.
Step 3: Add Passengers and Gear
Do not forget to account for the weight of passengers and any cargo inside the tow vehicle itself. A family of four with luggage can easily add 600-800 pounds. This weight counts against your payload capacity along with the tongue weight, which is a check many people overlook until they weigh their loaded rig at a CAT scale and discover they are over their GVWR.
Step 4: Review Your Results
The calculator runs five safety checks: towing capacity, tongue weight percentage, payload capacity, GCWR (if provided), and tongue weight ratio. Each check shows a clear pass, fail, or warning badge. The capacity usage bars give you a visual sense of how close you are to each limit. Green means under 80%, yellow is 80-90%, and red is over 90%. Staying well under your limits gives you a safety margin for hills, headwinds, and emergency maneuvers.
Understanding Tongue Weight
Tongue weight is the single most misunderstood towing safety factor. If tongue weight is too low (under 10% of trailer weight), the trailer becomes tail-heavy and is prone to dangerous trailer sway at highway speeds. If tongue weight is too high (over 15%), it overloads the tow vehicle's rear axle, causes the front end to lift, and reduces steering and braking effectiveness. The ideal range is 10-15% for conventional bumper-pull trailers. Use a tongue weight scale at a trailer supply store to measure yours accurately.
FAQ
Is this RV towing calculator really free?
Yes, this towing calculator is completely free with no signup required. All calculations run locally in your browser, and no data is ever sent to any server or stored anywhere.
Is my data safe when I use this tool?
Absolutely. Everything runs entirely in your browser using JavaScript. No vehicle specs, weight data, or personal information is transmitted or stored on any server.
Where do I find my vehicle's towing capacity?
Check your vehicle's owner's manual, the driver's door jamb sticker, or the manufacturer's website. Towing capacity varies by trim level, engine, axle ratio, and optional towing packages, so use the specs for your exact configuration.
What is tongue weight and why does it matter?
Tongue weight is the downward force the trailer hitch exerts on your tow vehicle. It should be 10-15% of the total trailer weight. Too little tongue weight causes trailer sway, while too much overloads your rear axle and reduces steering control.
What is GCWR and how is it different from towing capacity?
GCWR (Gross Combined Weight Rating) is the maximum allowable weight of the tow vehicle plus the trailer plus all occupants and cargo combined. Towing capacity is just the maximum trailer weight. You must stay under both limits for safe towing.
What is the difference between GVWR and curb weight?
Curb weight is how much your vehicle weighs empty with a full tank of fuel. GVWR (Gross Vehicle Weight Rating) is the maximum total weight including the vehicle, passengers, cargo, and tongue weight. The difference between GVWR and curb weight is your payload capacity.
Can I tow a trailer that weighs more than my towing capacity?
No. Exceeding your vehicle's towing capacity is unsafe and can cause brake failure, transmission damage, frame stress, and loss of vehicle control. It also voids your warranty and may violate traffic laws in most states.
How do I calculate my payload capacity?
Payload capacity equals your GVWR minus your curb weight. This is the maximum weight of passengers, cargo in the truck bed, and tongue weight from the trailer combined. You can also find it on the yellow sticker inside the driver's door jamb.