How Big Is a 10x10 Storage Unit?

By Nosson Dubin, owner · Last updated October 7, 2026

You've made a list of what's going into storage, and the size on the screen says 10x10, which doesn't mean much until you can picture it. How big is a 10x10 storage unit? It's 10 feet wide and 10 feet deep, which gives you 100 square feet of floor, the same floor as a room that measures 10 feet on each side.

We're a family-owned business renting storage units in Rockport, Texas, and when you're choosing a size, the number on the screen is easier to trust once you've seen it laid out at home.

A 10x10 in feet, and in a room you already know

A 10x10 storage unit size is 100 square feet, 10 feet across the front and 10 feet from the front to the back wall. Floor is the number to plan with, because the big pieces sit on the floor and the boxes go up from there.

Here are the numbers at a glance:

The easiest way to get a feel for 100 square feet is to measure a room you already live with. A spare bedroom that's 10 feet across and 12 feet long has 120 square feet, so a 10x10 has a little less floor than that room. A room that's 12 feet on each side has 144 square feet, nearly half again as much.

Then mark it out. Take a tape measure and a roll of painter's tape to a garage floor, a patio or a driveway, and tape a square 10 feet on each side. Set a few of your bigger pieces inside the lines, the sofa, the dresser, a stack of boxes, and walk around them.

It's a little startling how quickly that taped square fills up once the sofa is standing in it, and it's a lot better to find that out on your own driveway than on moving day.

What does a 10x10 storage unit look like?

A 10x10 storage unit looks like an empty square room with a door on one side, bare walls and a bare floor, and once you've rented it, it's yours to fill. Our post on gated storage units walks through a first visit, from the gate to the unit.

At our property every unit is either drive-up or climate-controlled. A drive-up unit's door opens straight onto a concrete drive aisle, so you park at your unit door and unload a few steps. A climate-controlled unit is inside its building, and you reach it through the building entrance.

Whichever kind you rent, look up when you first open the door. How high you can stack depends on that unit, so measure your tallest pieces before moving day, the wardrobe, the headboard, the bookcase, and check each one against the unit's door and ceiling when you get there.

Rolling up the door on an empty unit for the first time makes the whole job feel possible, because the space you've been sketching for a week is finally right there in front of you.

Square feet on the floor, and the space above it

Square feet tell you how much floor you have. The space above the floor counts too, but only for things that stack. Boxes, totes and chairs that nest can go up toward the ceiling, while a sofa, a mattress and a dining table mostly take floor and stay there.

That's why two lists with the same number of things can need very different units. A household of boxes and totes uses the height of a 10x10 well. A household of big furniture runs out of floor first, with empty air above it.

The longest piece matters as much as the total. Anything longer than 10 feet won't lie straight along a wall of a 10x10, though the floor measures a little over 14 feet corner to corner, so a long rolled rug or a tall headboard laid down can sometimes go across on the diagonal. If several of your pieces run past 10 feet, that's a reason to look at a deeper unit.

When you stack, put the heaviest boxes on the bottom and the lightest on top, and keep each stack straight and steady. Leave the things you'll want often near the door and at a height you can reach without a step stool.

The height you stack things at also decides how hard they are to lift down later. NIOSH's guidelines for manual material handling describe a power zone above the knees, below the shoulders and close to the body, and they give 51 pounds as the most to be lifted with two hands under ideal conditions.

Their advice for a load that's too heavy is to put fewer items in the container or use a smaller one, so books and tools go in small boxes and the big boxes get the light things. The boxes you'll lift most often belong at waist height near the door, where reaching them doesn't mean bending to the floor or stretching overhead.

How many cubic feet is a 10x10 storage unit?

A 10x10 storage unit holds 100 cubic feet for every foot of height you stack to, so boxes stacked 6 feet high fill 600 cubic feet. You can work any unit out the same way, the floor times the height you stack to.

That figure counts the air above the sofa along with the boxes, which is why the floor makes the better guide when most of what you're storing is furniture.

Measuring your things before you plan

Planning starts with measuring, and a tape measure is the one tool you need. Measure each big piece at its longest, deepest and tallest points, which means the arms of the sofa, the legs of the table and the handles on the dresser, since those are where it touches the walls.

Write each piece down with all three measurements. A mattress gets its thickness as well as its length and width, and a bookcase gets its height, because the tall pieces are the ones that can catch you out at the door.

Measurements in inches turn into feet when you divide by 12, and it's worth rounding up rather than down. A sofa that measures 86 inches is a little over 7 feet, so plan it as 7 and a half, and the inch or two you've allowed will be the room you need to get your hand behind it later.

If you have more boxes than furniture, count them by size instead of measuring each one. Measure one box of each size you're using, then count how many of each you've packed, and the sketch below takes care of the rest.

Planning the floor with a sketch

A sketch on graph paper saves a lot of guessing. Let each square stand for a foot, and draw a box 10 squares on each side. That's the floor of a 10x10.

Measure the length and width of each big piece in feet, multiply, and write the answer beside it. Say your sofa is 7 feet long and 3 feet deep, so it covers 21 square feet. A dresser 5 feet wide and 2 feet deep covers 10. Cut those shapes out of paper at the same scale and move them around inside the square until they sit the way you'd want them.

Then decide whether you want an aisle. If you'll need to reach the back without unloading the front, a path 2 feet wide running the 10 feet from the door to the back wall takes 20 square feet of the floor, which leaves 80 for your things. If you'll fill the unit once and empty it once, you might not need the aisle at all.

Add up what your big pieces cover, leave room for the boxes, and compare the total with the 100 square feet you've got. If the paper shapes already crowd the square, you'll know before you rent, and that's a much easier afternoon than finding out with a loaded truck.

What fits in a 10x10, by floor area

A 10x10 holds a studio apartment, appliances included, or the furniture of a room or two, and what fits comes down to floor area, so the quickest check is to compare each piece's footprint with the 100 square feet. Our 10x10 page goes into what fits in more detail.

A king mattress, which Sealy's mattress size guide gives as 76 inches by 80 inches, covers about 42 square feet lying flat, close to half the floor. A queen, at 60 inches wide and 80 inches long by the same guide, covers about 33. A king-size bed fits in a 10x10: the mattress covers about 42 of the 100 square feet, which leaves more than half the floor for the frame and everything else.

Plan a mattress as floor it keeps to itself. Sealy's advice on how to store your mattress is to store it as flat as possible with little to nothing stacked on top, and it warns that turning a mattress on its side can greatly compromise its structure. That 42 square feet for a king is floor you won't be stacking boxes on.

For totes, use the one you own. Sterilite's 27-gallon Industrial Tote measures 28 1/2 inches long and 19 5/8 inches wide on the outside, so four fit along one 10-foot wall and six along the other.

Twenty-four of those totes fit in a single layer across the floor of a 10x10, or 16 if you keep a 2-foot aisle down the middle, and each layer you stack adds that many again. At 15 1/2 inches tall, four of them stacked stand about 62 inches, a little over 5 feet.

Appliances are easy to plan for, because their makers publish their sizes. Whirlpool's laundry sizing guide puts a standard side-by-side washer and dryer set at about 54 inches wide and 32 to 34 inches deep, which is about 12 to 13 square feet of floor for the pair.

For a refrigerator, Whirlpool's advice for moving one is to keep it upright at all times and use a dolly rated for its weight, and for a long stretch unplugged, to prop the doors open with a towel to prevent mildew once it's empty.

A couch fits the same way, by its length and depth. Our post on what size storage unit you need for a two-bedroom apartment or house works through whole rooms.

Should I get a 10x10 or 10x15?

Get a 10x10 if everything on your list fits in its 100 square feet with room to reach it, and a 10x15 if the list needs more than about 80 square feet once you've kept a 2-foot aisle, or if the big furniture won't sit side by side in a 10-foot square.

A 10x15 is 150 square feet, half again the floor of a 10x10. The extra 5 feet makes it a longer room, so it's the shape for a long row of furniture with boxes stacked along the side.

Here's how one sketch might go. Say the list is a queen mattress laid flat at about 33 square feet, a sofa at 21, a dresser at 10, a table 4 feet by 3 feet at 12, and four dining chairs stacked in two pairs at about 8.

Add 20 boxes 18 inches on each side, stacked four high in five stacks at about 11 square feet. That comes to roughly 95 square feet, which fills a 10x10's floor with about 5 square feet left over. With a 2-foot aisle it doesn't fit, and a 10x15 holds the same list with a 2-foot aisle down its length.

The surest check is to draw both floors on the same sheet, put the same paper shapes in each, and see which one leaves you an aisle you can walk down. Our 10x15 page has that size, and our post on how big a 10x15 and a 10x20 are goes further into the larger sizes.

Think too about what's coming later. If more is going in after the first load, or you'd like to walk to the back to fetch something in a few months, the extra floor is where that goes. If the list is final and you'll stack it once and leave it, a full 10x10 can do the job.

Smaller and larger than a 10x10

The sizes either side of a 10x10 are easiest to compare in square feet. A 5x10 has 50 square feet, half the floor of a 10x10, and our post on 5x5 and 5x10 storage units covers the small sizes. A 10x15 has 150. A 10x20 has 200, twice the floor of a 10x10, and it's 20 feet long.

Our Size Guide sets the sizes side by side, our 10x20 page covers the longest of them, and our post on what size storage unit you need for a one-bedroom apartment starts from the smaller end.

Two ways to lay out a 10x10

One layout runs an aisle from the door straight to the back wall, with furniture and stacks along both side walls. It suits a unit you'll be coming back to, because every stack has a face on the aisle and nothing is buried. The aisle takes about 20 square feet, so draw it on the sketch before anything else.

The other fills the back and the sides solid and leaves an open patch just inside the door. It holds the most, and it suits a load that's going in once and coming out once, the way a houseful of furniture does during a renovation.

Either way, the sketch shows you before moving day which one your list allows. If the aisle layout won't fit and you know you'll need to get at things, that's the plainest sign the list wants a bigger unit.

Loading a 10x10 so you can reach things later

Load the back wall first with the things you'll want least, and work toward the door. Big furniture goes in early, along the walls, with the boxes stacked in front of it or on top of the sturdy pieces that can take the weight.

Take the legs off a table if they unscrew, and keep the screws in a bag taped to the underside. Chairs stack seat to seat, with a blanket between them, and the stack takes the floor of one chair.

Lay the mattress flat where nothing will end up on it, and put a furniture blanket between two pieces that touch.

Load the truck with the unit in mind. The things that belong against the back wall need to come off the truck first, so they go on the truck last, and the boxes you'll want near the door go on first.

It's slow work at the start, deciding where each piece goes, and then the last boxes go in quickly, because by then you can see exactly where the gaps are. Keep the aisle clear as you go, because once the boxes start arriving the path to the back is the first thing to disappear.

Label each box on the top and on two sides, so you can read it however it's stacked, and keep a list of what's in each one. Our post on packing for storage goes into the boxes, the labels and the loading order in more detail.

Leave food, gas cans and propane tanks at home, and anything with a fuel tank needs our written permission before it goes in.

Before you rent a 10x10

Finish the sketch first, with every big piece measured and the boxes counted, and decide whether you want an aisle. Then check the tallest pieces against the door and ceiling of the unit when you get there, and keep the sketch on your phone for moving day.

Decide too whether you want a drive-up unit or a climate-controlled one, which comes down to what's going in and how long it'll stay. Our post on climate-controlled storage goes through which things need it, and the rate for every size we have open is on our price list.

Take a photo of the unit once it's loaded, standing at the door. It's the quickest way to remember where the dresser ended up when you come back for something months later.

Renting a 10x10 in Rockport

Rockport sits between Aransas Bay and Copano Bay, and 298 of our 558 units are climate-controlled. The 10x10 is the size we have most of, 191 units. The property is eleven single-level buildings that went up between 2017 and 2025, so every unit is at ground level, and the buildings have ramps at their entrances.

You'll have your own gate code, and you can get in from 5 AM until 10 every night, seven days a week. If you rent online, your gate code is emailed to you after you finish, and it works right away. The gate lets you out without a code, and if your code ever gives you trouble, call us during phone hours.

Siyata Storage is at 825 W Market Street. Some older listings show 835 — that is a separate private building next door, not us. Emilio answers the phone 8 AM–5 PM Monday–Saturday, and we respond to every message during those hours.

When the sofa, the dresser and the boxes all fit on the sketch, the move stops feeling like a guess.

Tell us what you're storing and we'll help you pick a size. Call 361-200-1492, 8 AM to 5 PM Monday to Saturday. Hablamos español.