What size storage unit do I need? A size guide in m²

What size storage unit do I need? Most people answer it by eye and then pay for empty air, or the last wardrobe does not fit through the door. Yet three numbers are enough: the floor area, the height of the unit and the size of the door.

Below is our storage unit size guide in m²: what fits in a 2, 3.6, 7.2 and 14.4 m² unit, how many boxes go on a square metre, how to convert a van load, how the American 5x5 and 10x10 sizes translate, and which units were free on 9 November 2026 with their floor, volume and door.

The three numbers that decide

• Floor area in m². We quote prices and sizes by floor area. Each unit's page also gives the length and width, so you can see whether a unit is long and narrow or closer to square.
• Height. Almost all our units are 2.60 m high. Containers have a solid steel ceiling at 2.60 m. Indoor units at Holíčska and Tomášikova have 2.60 m walls and no ceiling of their own; the hall above is over 3 m high. The exception is the smallest boxes at Holíčska, only 1.01 to 1.20 m high.
• The door. Indoor units 0.80 × 1.95 m, ordinary containers 0.80 × 2.00 m, the 14.40 m² units and container N29 in Nitra double doors of 2.25 × 2.30 m. For furniture the door decides before the floor area does.

Volume is simple: floor area times 2.60 m. A 3.60 m² unit holds about 9.4 m³, a 7.20 m² unit about 18.7 m³. In practice you stack to about 2 m and keep an aisle to reach the back wall, so you really use about two thirds of the volume.

Which size for what

This is our size guide, the same one you find on the unit types and sizes page:

• Box up to 1.20 m²: tyres, document boxes, suitcases, seasonal clothes. A bicycle or skis will not fit because of the height.
• Up to 3 m²: seasonal things from a balcony or hallway, a set of tyres, skis, a sledge, a pram, a few boxes. A bicycle standing on its back wheel fits even in a unit of about 1.5 m².
• 3 to 5 m²: a whole balcony or cellar, bicycles, the dismantled furniture of one room, a fridge or washing machine, camping gear.
• 5 to 7 m²: the furniture of a one-room flat or up to about 100 moving boxes.
• 7 to 12 m²: the contents of a two-room flat including appliances, beds and wardrobes; for companies, goods on pallets or an archive.
• 12 m² and more: a three-room flat, building materials, dozens of euro pallets.

If you are choosing between a container and an indoor unit of the same size, temperature, car access and what you store decide it. We compare them in our article on container or indoor storage unit.

5x5, 10x10 and the other sizes in feet

Size guides from the US and the UK quote units in feet. Here is how they translate into square metres and into our units:

• 5x5 ft is about 2.3 m²: our indoor units H43 and H44 at 2.25 m².
• 5x10 ft is about 4.6 m²: our 3.60 m² containers or the indoor unit T73 at 4.94 m².
• 10x10 ft is about 9.3 m²: closest are our 7.20 m² containers (3.00 × 2.40 m, roughly 8x10 ft).
• 10x15 and 10x20 ft are about 13.9 and 18.6 m²: our 14.40 m² containers (6.00 × 2.40 m, roughly 8x20 ft).

Our ceiling height of 2.60 m is about 8.5 ft, a little more than the 8 ft many American units have.

Boxes, furniture and a van: how to convert

Boxes. A standard moving box is 60 × 40 × 40 cm. About four stand side by side on 1 m² of floor, and five layers reach about 2 m, so roughly 15 to 20 boxes per square metre. A 3.60 m² unit with an aisle takes about 50 boxes.

Furniture. Take apart whatever comes apart: bed, wardrobe, table. Dismantled furniture stands on edge against a wall and takes a fraction of the floor. Measure a sofa that does not come apart and compare it with the door: through a 0.80 m door it goes only on its side, through 2.25 m double doors with ease.

A van. By our estimate the load of a small van with about 6 m³ of cargo space fits a 3.60 m² unit, and a large van with about 12 m³ fits a 7.20 m² unit. If the whole flat is moving, our week-by-week moving plan helps too.

Free units by size on 9 November 2026

That day 65 units were free. Prices per month on a 1, 6 and 12-month term, excluding VAT. 23% VAT is added where the location's landlord is VAT registered: always in Nitra, in Bratislava for companies with a VAT number.

• H50B, H50C, H50D, Holíčska, box 0.99 to 1.02 m², floor 0.93 × 1.06 to 1.10 m, height 1.01 or 1.20 m, hatch 0.80 × 1.00 m: 37€, 32€ and 28€.
• H17, H22, H20, Holíčska, 1.82 to 2.02 m², floor 1.46 × 1.25 to 1.55 × 1.30 m, about 4.7 to 5.3 m³: 54€, 48€ and 43€.
• H43, H44, Holíčska, 2.25 m², floor 1.25 × 1.80 m, 5.9 m³: 70€, 64€ and 59€.
• T13, T14, Tomášikova, 2.56 m², floor 1.55 × 1.65 m, 6.7 m³, with a 20% discount: 81€, 72€ and 63€.
• D51, D53, D56, Dúbravka, container 3.60 m², floor 2.40 × 1.50 m, 9.4 m³, first floor by the stairs: 75€, 64€ and 48€.
• T44, T58, T67, Tomášikova, 3.60 m², floor 2.00 × 1.80 m, with a 20% discount: 91€, 82€ and 74€.
• T73, Tomášikova, 4.94 m², floor 1.30 × 3.80 m, 12.8 m³, with a 20% discount: 115€, 107€ and 99€.
• D4, Dúbravka, container 7.20 m², floor 3.00 × 2.40 m, 18.7 m³, ground floor, drive up to the door: 108€, 97€ and 86€.
• N29, N31, N62, Nitra, 7.20 m², ground floor, drive up to the door, N29 with double doors: 85€, 74€ and 64€.
• P36, P38, Pionierska, 14.40 m², floor 6.00 × 2.40 m, 37.4 m³, ground floor, double doors: 171€, 147€ and 135€.
• N2, N10, Nitra, 14.40 m², ground floor, double doors, with a 20% discount: 132€, 113€ and 104€.

No units of 5 to 7 m² were free that day. If you need exactly that size, take a smaller unit and use the height, or a 7.20 m² container, or sign up on the location page to be told when a unit frees up. How the price is made up and what the first payment covers is in our article on storage unit prices in Bratislava.

Common mistakes

1. Choosing by m² alone. A 3.20 m² unit with a 1.23 × 2.60 m floor and a 3.60 m² unit with a 2.00 × 1.80 m floor behave quite differently once furniture goes in.
2. Forgetting the door. A wardrobe that does not come apart or a wide sofa will not pass a 0.80 m door. The 14.40 m² unit with double doors is for furniture like that.
3. No aisle. A unit filled from wall to door is full, but you cannot reach the things at the back. Keep an aisle of at least 50 to 60 cm.
4. The cheapest box for everything. The boxes at Holíčska are 1.01 to 1.20 m high. Great for boxes and tyres, not for a bicycle or furniture.
5. A bigger unit "just in case". You pay for every extra m² every month. Count the boxes, measure the furniture.
6. Overlooking the floor level. First-floor containers are cheaper, but heavy things go up the stairs. For a washing machine and wardrobes a ground-floor unit you can drive up to is better.

When less is enough

• Only seasonal things. Tyres, skis and winter clothes fit in 2 m², stacked thanks to the height.
• Furniture that comes apart. A dismantled bedroom takes less than a third of the floor it took assembled.
• Mostly boxes. Boxes stacked high use the full 2.60 m. More on small units in our article on a small storage unit from 1 m².

How to go about it

1. List what you are storing and count the boxes.
2. Measure the largest item that does not come apart and compare it with the door.
3. Pick a floor-area range from the guide above.
4. On the location page set the size filter and compare floor, height, door and floor level.
5. Choose the term: 1, 3, 6, 9 or 12 months, or exactly to a date.
6. Fill in your details and pay by card, bank transfer or QR payment. The contract starts with the first payment and you get access at once; it takes about 10 minutes.

What TOP SKLAD offers

We run six sites in Bratislava and one in Nitra, 519 units in total from 0.99 to 28.8 m². The indoor units are at Holíčska 7 in Petržalka and Tomášikova 50D in Nové Mesto, the containers at Dúbravka, Gessayova, Kaukazská, Pionierska and in Nitra. Access is 24 hours a day, the sites are fenced with recording cameras and you lock the unit with your own padlock. Insurance of your things up to 2,000€ is included. Every unit on the site shows its length, width, height, volume and door size, so you can choose before your first visit.

Frequently asked questions

What size storage unit do I need for a one-room flat?

The furniture of a one-room flat needs 5 to 7 m²; with dismantled furniture and few boxes a 3.60 m² container can do. A two-room flat needs 7 to 12 m².

How many boxes fit in a storage unit?

About 15 to 20 moving boxes of 60 × 40 × 40 cm per square metre of floor, stacked to about 2 m. A 3.60 m² unit with an aisle takes about 50 boxes.

How big is a 10x10 storage unit in metres?

10x10 ft is about 9.3 m². Our nearest size is the 7.20 m² container with a 3.00 × 2.40 m floor and 2.60 m height, about 18.7 m³.

Will a sofa or wardrobe fit?

If it does not come apart, the door decides. Most units have a 0.80 m door; the 14.40 m² units and N29 in Nitra have double doors of 2.25 × 2.30 m.

What container sizes do you have?

Containers of 3.60 m² (floor 2.40 × 1.50 m), 7.20 m² (3.00 × 2.40 m) and 14.40 m² (6.00 × 2.40 m), all 2.60 m high. Indoor units start at 0.99 m².

Related articles

• storage unit prices in Bratislava and Nitra