What Size Moving Truck Do You Need?
Pick the wrong truck and your whole DIY move tilts. Too small, and you are standing in an empty apartment at 9 p.m. with a couch that won’t fit, doing the math on a second trip you never budgeted for. Too big, and you have paid for cubic feet you’ll drive empty, burned extra fuel, and signed up to wheel a long box truck through streets it barely fits on. The good news is that sizing a rental truck is not guesswork. With a rough read of what you own and a look at how rental companies rate their fleets, you can land on a size that fits in one load without wasting a dime.
This guide is about choosing the size. It does not cover how to book or pick up the truck (see our guide on renting a moving truck), and it does not cover how to load it so everything fits (see our guide on loading a truck). What follows is the decision: how many feet of box you actually need.
Why Truck Size Matters Most for DIY Moves
When you hire full-service movers, the truck is their problem. They show up, they size it, and if they guess wrong they send a second truck. When you move yourself, every consequence of the size decision lands on you.
A truck that is too small forces the worst outcome in a DIY move: the two-trip trap, which can double your driving, your fuel, and your hours if the second leg is across town or across the state. A truck that is too big is less painful but still costs you. Larger trucks are harder to maneuver, harder to park, less fuel-efficient, and on most rental lots they cost more per day. There is also a real safety dimension. A long box truck handles nothing like your car, with a much wider turning radius, a tall profile that catches crosswinds, and braking distances that surprise first-time drivers (we cover that in our guide on driving a large moving truck).
One thing size does not usually trigger for a household move is a special license. For personal, non-commercial use, the rental trucks the major companies offer to consumers are built to stay under the commercial threshold. Federal rules define a commercial motor vehicle by gross vehicle weight rating, and a CDL becomes mandatory only at a GVWR of 26,001 pounds or more. Penske states plainly that you do not need a CDL to rent its 22- or 26-foot box trucks for personal use as long as the GVWR is 26,000 pounds or less. So sizing up to the biggest consumer truck won’t put you in license trouble, but it will put you behind the wheel of a vehicle that demands respect.
Common Truck Sizes and What They Hold
Rental fleets are organized by box length in feet, and each length comes with a recommendation for the size of home it suits. Here is the catch worth knowing up front: the numbers are not standardized across companies, and the bedroom labels are marketing shorthand, not a promise. Use them as a starting point, then estimate your actual load (next section).
U-Haul’s consumer lineup, with the interior volumes the company publishes, runs like this:
| Truck | U-Haul interior volume | U-Haul's recommended home |
|---|---|---|
| 10 ft | 402 cu ft | Studio apartment / 1-bedroom home |
| 15 ft | 764 cu ft | 2-bedroom apartment / 1-bedroom home |
| 20 ft | 1,016 cu ft | 3-bedroom apartment / 2-bedroom home |
| 26 ft | 1,684 cu ft | 3–4 bedroom home |
Penske breaks its fleet down by rooms rather than bedrooms, and its lengths are different:
| Truck | Penske's recommended capacity |
|---|---|
| Cargo van | Up to 1 room (studio, single appliances) |
| 12 ft | 1–2 rooms (dorm or efficiency apartment), about 450 cu ft |
| 16 ft | 2–3 rooms (one-bedroom apartment or small home) |
| 22 ft | 3–5 rooms, up to a three-bedroom home |
| 26 ft | 5–7 rooms, up to a five-bedroom home |
Look closely and you’ll see the disagreement. U-Haul calls its 26-footer a 3–4 bedroom truck; Penske calls its 26-footer a 5-bedroom truck. Same box length, very different claim. That is not a contradiction to resolve, it is a reminder: “bedrooms” is a rough proxy that ignores how much stuff a given household actually owns. A minimalist couple in a three-bedroom house may fit a 20-foot truck with room to spare, while a packrat couple in a one-bedroom apartment can overflow it. Treat the charts as the floor of your research, not the answer.
How to Estimate Your Load
The honest way to size a truck is to estimate volume, because a truck’s job is to swallow cubic feet. You don’t need a tape measure on every box, but you do need a method.
Start with a walkthrough. Go room by room and write down the big, non-collapsible items, because those are what actually consume box space: sofas, mattresses and box springs, dressers, the refrigerator if it’s coming, the dining table, the washer and dryer, bookshelves, and any large appliance or piece of exercise equipment. These set your floor. A queen mattress, a full-size couch, and a tall dresser eat real footage no matter how tightly you pack around them.
Then account for the boxes. Most people drastically undercount here, especially in kitchens, garages, and closets full of seasonal gear. A simple field trick: stack your packed boxes in one area as you finish each room, so you can see the pile grow instead of imagining it. If the wall of boxes is already chest-high before you’ve touched the garage, your earlier size estimate is probably too small.
Some rental companies publish room-by-room or item-by-item estimating tools that convert your inventory into a suggested truck. Those are useful, but feed them an honest count. The single most common DIY sizing mistake is optimism: assuming things will compress, that the couch will “probably fit,” that you’ll pack tighter than you actually will. Real loads have wasted space around odd shapes, and you cannot stack to the ceiling everywhere. Build in slack.
A practical rule of thumb that works without any calculator: picture the load fitting comfortably, not perfectly. If your honest mental image already has the truck packed wall-to-wall and floor-to-ceiling with zero margin, you are looking at the wrong size.
When to Size Up (or Down)
The bedroom charts assume an average household, and you are not average. Adjust for what is true about your stuff.
Size up if any of these describe you:
- You own bulky, awkward items: a sectional sofa, a king bed, a treadmill or Peloton, a piano, large patio furniture, or a workshop’s worth of tools.
- You have a packed garage, basement, or storage unit on top of the living space.
- You’ve lived in the place a long time and accumulated more than the bedroom count suggests.
- The drive is long or one-way, where a second trip isn’t just annoying but effectively impossible.
Size down if these fit you:
- You’ve decluttered hard and donated or sold furniture before the move (see our guide on downsizing before a move).
- Your place came furnished, so the big pieces aren’t yours to haul.
- You’re moving a sparse studio or a single room, where even a small truck or cargo van has margin.
When you land between two sizes and genuinely can’t tell, the better default for a single-load move is usually the larger truck. The cost gap between two adjacent sizes is modest compared with the cost of a second trip, and unused space in a too-big truck doesn’t hurt you the way a too-small truck does. The exception is the very tight city move: if you’re threading a narrow street, a steep driveway, or a parking situation that can’t accommodate a 26-footer, the smaller truck you can actually park and unload beats the bigger one you can’t.
Avoiding the Two-Trip Trap
The two-trip trap is the failure mode this whole decision exists to prevent, and it almost always comes from the same root cause: underestimating volume and trusting the optimistic bedroom label.
A second trip is rarely just “one more load.” It can double your driving distance and fuel, add hours you didn’t plan for, and on rentals priced with mileage it can quietly inflate the bill. On a one-way or long-distance move it may be flatly unworkable, because you can’t drive back across three states for the dining table you couldn’t fit.
To stay out of the trap:
- Estimate before you reserve, not after. Do the room-by-room walkthrough first, then choose the size. Reserving by guesswork and hoping is how people end up short.
- Round up when you’re genuinely unsure. Margin in the box is cheap insurance against a return trip.
- Account for everything, including the garage and the closets. These are the spaces people forget, and they are where the overflow comes from.
- Plan the load, but size for reality. Good loading helps you use every cubic foot, yet no packing skill turns a 15-foot box into a 20-foot box. Pick the size that fits your real inventory, then pack it well.
Get the size right and the DIY move becomes what it should be: one truck, one trip, one set of keys handed back. The math is simple once you respect it. Inventory honestly, read the rental charts as a guide rather than gospel, and when in doubt about a single-load move, the extra few feet of box usually pays for itself the moment you don’t have to make a second run.
This article is general information to help you plan, not professional advice. Truck specifications, recommended capacities, and licensing rules can change and vary by rental company, vehicle, and state. Confirm current sizes, dimensions, and any license requirements directly with the rental company and your state DMV before you book.
Sources
- Moving Truck Sizes, Penske Truck Rental, Penske truck sizes and recommended room/bedroom capacity (cargo van, 12 ft, 16 ft, 22 ft, 26 ft); 12 ft ~450 cu ft.
- U-Haul Truck Sizes (U-Haul specification table, republished by U-Pack), U-Haul interior volumes and recommended home size for the 10, 15, 20, and 26 ft trucks.
- CDL vs. Non-CDL Truck Rentals, Penske, No CDL needed to rent a 22- or 26-foot box truck for personal use at a GVWR of 26,000 lb or less; CDL required at 26,001 lb or more.