Do I need a CDL? Checker

How the checker works

The checker applies the federal CDL vehicle groups in order, from the heaviest down.

1. Class A. A combination of vehicles with a combined weight rating of 26,001 lb or more, where the towed unit is rated over 10,000 lb Source: eCFR, 202649 CFR 383.91 Commercial motor vehicle groupseCFR (Office of the Federal Register), 2026. Checked 2026-10-10.Open the source.
2. Class B. A single vehicle rated 26,001 lb or more, including one towing a trailer rated 10,000 lb or less.
3. Class C. A vehicle that isn't Class A or B, but is designed to carry 16 or more people including the driver, or is placarded for hazardous materials Source: eCFR, 202649 CFR 383.91 Commercial motor vehicle groupseCFR (Office of the Federal Register), 2026. Checked 2026-10-11.Open the source.
4. No CDL. Anything below all three lines.

The federal definition of a commercial motor vehicle uses the weight rating or the actual weight, whichever is greater Source: eCFR, 202649 CFR 383.5 DefinitionseCFR (Office of the Federal Register), 2026. Checked 2026-10-10.Open the source. That means an overloaded truck can cross the line even if its sticker says otherwise.

It then adds the endorsements that apply: H for placarded hazmat, N for tank vehicles, X for both, P for passenger vehicles and T for double or triple trailers Source: eCFR, 202649 CFR 383.153 Information on the CDL documenteCFR (Office of the Federal Register), 2026. Checked 2026-10-10.Open the source.

Three quick examples

The pickup example surprises people. Neither piece alone is close to 26,001 lb, but together they're rated 30,000 lb with a trailer over 10,000 lb, so it's a Class A combination.

Finding your weight ratings

You need two numbers, and both are printed on the equipment.

• Truck GVWR. The gross vehicle weight rating is on the certification label, usually a sticker on the driver's door frame. It's the most the truck is built to weigh fully loaded, including itself, fuel, driver and cargo.
• Trailer GVWR. Trailers carry their own label or VIN plate, often on the front of the frame or the tongue. Use the trailer's rating, not the combined rating some pickup makers advertise.

If the labels are missing, the manufacturer or dealer can look the ratings up from the VIN. Write them down and keep a photo in the cab. Brokers, insurers and inspectors may all ask for them, and they decide more than the CDL: registration, some tolls and many state rules also depend on weight ratings.

Where people get it wrong

• Using the empty weight. The line is the rating on the sticker or plate, or the actual weight if that's higher. An empty truck that would be over the line loaded still needs a CDL driver.
• Forgetting the trailer. Adding a heavy trailer to a Class B truck can make it Class A.
• Swapping trailers. The class follows the trailer you're pulling that day. A heavier trailer can change the answer.
• Hazmat at any weight. Placarded hazmat needs a CDL even in a vehicle under 26,001 lb.

What changes once you need a CDL

Crossing the CDL line brings more than a license. CDL drivers are covered by DOT drug and alcohol testing, a medical card is required, and interstate drivers must be at least 21. Our guide on how old you have to be to be a truck driver explains the age rules. CDL drivers also track their hours under the federal limits. The hours of service calculator shows what's left on your clocks, and the paper log book grid generator prints a backup log.

Wondering how the rigs in each class differ? Our guide to the types of semi trucks walks through tractors, trailers and straight trucks.

Box trucks, hotshots and the CDL line

Many owner-operators start below the CDL line on purpose. A 26 ft box truck rated at 26,000 lb can be driven without a CDL, which makes hiring drivers easier. Hotshot setups sit right on the line, and the trailer choice decides which side you land on. Either way, know your ratings before you buy, and before you hire.

We dispatch both. See box truck dispatch for 26 ft trucks, or browse more free calculators on the trucking tools page.

Sources: eCFR, 49 CFR 383.91 Commercial motor vehicle groups (2026); eCFR, 49 CFR 383.91 Commercial motor vehicle groups (2026); eCFR, 49 CFR 383.5 Definitions (2026); eCFR, 49 CFR 383.153 Information on the CDL document (2026).