Karma Movers logo

What size storage unit do I need?

Karma Movers·Updated April 2026

Choosing the right storage unit size in St. Petersburg saves money and protects your belongings. Unit sizes are simple arithmetic: a 10x10 is 100 square feet, a 10x15 is 150, and a 10x20 is 200. Match them to a walk-through of your own inventory rather than relying on bedroom count alone.

Quick Answer

Pick a unit by measuring your inventory, not by bedroom count alone. A 5x5 is 25 square feet, a 5x10 is 50, a 10x10 is 100, a 10x15 is 150, and a 10x20 is 200. Walk through your belongings, measure the largest items, then ask the facility to confirm the size.

Key Takeaways

  • A unit size is length times width: a 10x10 is 100 square feet, a 10x15 is 150, and a 10x20 is 200.
  • Multiply square feet by the ceiling height for cubic feet; with an 8-foot ceiling, a 10x10 is 800 cubic feet.
  • Walk through your inventory and measure the largest items, then ask the facility to confirm the size.
  • Leave room for an aisle: tight packing in St. Petersburg's humidity can restrict airflow and raise moisture risk in a standard unit.
  • Request written estimates for dates you can actually use. Keep the inventory and service scope the same so you can compare availability, minimum bookings and date-related charges.
  • Disassembling furniture and stacking vertically makes better use of whatever size you choose.
storage unit sizeSt. Petersburg10x1010x1510x20climate controlcubic footagePinellas Countyinventory walk-throughpacking efficiencyhumidity protectionunit dimensionsself-storage
Storage Unit Size Arithmetic - Square Feet and Cubic FeetUnit Size / Sq FtCubic Feet with an 8-foot ceiling5x5 / 25 sq ft25 x 8 = 200 cubic feet5x10 / 50 sq ft50 x 8 = 400 cubic feet10x10 / 100 sq ft100 x 8 = 800 cubic feet10x15 / 150 sq ft150 x 8 = 1,200 cubic feet10x20 / 200 sq ft200 x 8 = 1,600 cubic feet10x30 / 300 sq ft300 x 8 = 2,400 cubic feetSquare feet is length times width. Confirm the actual ceiling height and usable dimensions with the facility.

Quick size guide

  1. List every large item and every box, and measure the largest pieces.
  2. Compare your list against the unit's usable length, width, and ceiling height.
  3. Ask the facility to confirm the size and the ceiling height in writing.
  4. When in doubt between two sizes, ask whether you can leave room for a walking aisle in the smaller one. If not, take the larger.
  5. In St. Petersburg's humidity, always leave an aisle for airflow and check on the unit regularly.

How do you match your belongings to the right storage unit size?

Bedroom count is only a rough starting point, because two households with the same number of bedrooms can own very different amounts of furniture. A more reliable method is an inventory walk-through: list each room, note the large pieces (sofas, beds, dining tables, desks, wardrobes, appliances), and measure the biggest ones. Count your boxes or estimate how many you will pack. Then compare that list with the usable floor area and ceiling height of the units you are considering.

Leave room for an aisle. The excess space in a slightly larger unit is not wasted: it gives you access to items you need and airflow that helps protect against humidity-related moisture buildup. Overcrowding a unit that is technically large enough but has no airflow can still lead to mold on the bottom layers of furniture, which is why sizing up can be a cheap form of insurance in Florida's climate.

How much cubic footage do different storage units actually provide?

Cubic Footage by Unit Size, with an 8-foot Ceiling200 cu ft5x525 sq ft400 cu ft5x1050 sq ft800 cu ft10x10100 sq ft1200 cu ft10x15150 sq ft1600 cu ft10x20200 sq ft2400 cu ft10x30300 sq ft

Cubic footage can be a more useful sizing measure than square footage because usable vertical space matters when you stack. Ceiling height varies by facility, so confirm it before signing, especially if you plan to add shelving or store tall items upright. A 10x10 with an 8-foot ceiling provides 800 cubic feet, while the same footprint with a 7-foot ceiling provides 700 cubic feet, a meaningful difference for a smaller load.

Also ask whether the stated ceiling height applies to the unit you will actually get, since some buildings have units that differ by floor or position. Keeping a written inventory of your items, with approximate dimensions, also makes it easier to choose a size and to document your belongings if anything is damaged later.

Unit Size Comparison: Floor Footprint at a Glance25 ft²5x550 ft²5x10100 ft²10x10150 ft²10x15200 ft²10x20300 ft²10x30

How do you quickly decide which unit size is right for your situation?

Start with a quick item count. Before visiting any facility in St. Petersburg, list the large furniture pieces you are storing: sofas, beds, dining tables, desks, wardrobes, and appliances each count as one large item. Boxes, lamps, and small chairs count as small items. Large furniture stacks differently than boxes and needs more floor footprint per piece, so a long list of big items pushes you toward the larger sizes regardless of bedroom count.

Then work in this order: measure the biggest pieces so you know they fit through the unit door; total the floor space your large items will occupy; add room for boxes stacked on and between them; and add a walking aisle. If the total is close to the floor area of one size, take the next size up. Keep the written inventory with approximate dimensions for each item. It helps you choose the size before you rent, and it supports a claim if anything is damaged during loading, transport, or storage.

How does packing style affect which unit size you actually need?

Packing efficiency has a large effect on how much a unit can hold. Furniture stored assembled takes up a lot of floor space, while furniture disassembled and stacked vertically takes up much less. The difference between assembled and disassembled storage can be the equivalent of an entire unit size, so the choice between two sizes often comes down to whether you take time to break down furniture before loading and use shelving or vertical stacking.

In St. Petersburg's climate, packing efficiency and humidity management are related. Dense, poorly organized units trap moisture in the spaces between items. Leaving a central aisle and placing heavier, less humidity-sensitive items on the floor while keeping moisture-vulnerable items such as wood, fabric, and documents on shelves or elevated platforms keeps air moving and lowers the risk of mold and warping. A well-organized unit of a given size can hold more usefully than a crammed unit one size larger.

What special items require a larger or different type of storage unit?

Some items need extra space planning beyond the inventory walk-through. A piano takes up floor space and cannot be stacked on, so measure it and add that floor area to your total. Artwork and antiques ideally have their own climate-controlled space rather than sharing a tightly packed unit, both for humidity management and to reduce the risk of damage from shifting items. Large appliances such as refrigerators and washing machines need floor space and should not be laid on their sides for storage without checking the manufacturer's guidance.

Vehicle storage, including motorcycles, golf carts, and small boats, is a different question. Ask facilities directly what they offer, whether enclosed or open-air covered parking, and what their rules are. Open-air parking can suit a vehicle but is not appropriate for household goods given the humidity. For households combining a vehicle and household goods, two separate spaces may be more practical than sharing one.

How does Florida's climate and hurricane season affect unit size decisions?

Atlantic hurricane season runs June 1 to November 30 (National Hurricane Center), and a typical evacuation scenario involves a household needing quick access to storage for furniture and valuables with little lead time. In that situation, a unit that is a little larger than your minimum need is a practical advantage: you can load quickly without the precision a tightly sized unit demands.

If you use a mover for emergency storage, ask for the storage terms and charges in writing. A registered Florida mover must prepare a written estimate and contract that is itemized with all costs and services before any moving service (s. 507.05, Florida Statutes). Keeping an updated home inventory lets you act quickly and confidently during an emergency instead of guessing at unit size under pressure.

How does the right unit size vary by St. Petersburg neighborhood?

If your facility has interior corridors, take measurements of large furniture before move-in day and ask the facility about hallway and doorway widths, elevators, and carts. Confirm that oversized sofas or sectionals can reach your unit. Ask whether drive-up units are available if you have very large items to store.

What are the most common size-selection questions from St. Petersburg storage customers?

It depends on your inventory more than the bedroom count. A 10x10 unit is 100 square feet, which is 800 cubic feet with an 8-foot ceiling. Walk through your belongings, measure the largest items, then ask the facility to confirm the size. If you have a pull-out sofa, a large wardrobe, or oversized furniture, consider a 10x15, which is 150 square feet, so you have working room and do not have to stack items unsafely.

A 10x20 unit is 200 square feet, or 1,600 cubic feet with an 8-foot ceiling. Whether that is enough depends on what you own, especially large furniture, a garage, or workshop equipment. Walk through your inventory, measure the largest items, and ask the facility to confirm the size. Disassembling bed frames and stacking vertically makes better use of whatever size you choose.

A 5x10 unit is 50 square feet. Whether your studio fits depends on how much large furniture you have. Walk through your inventory, measure the largest items, and ask the facility to confirm the size. If you are close to the limit, a 10x10, which is 100 square feet, is the safer choice. In St. Petersburg's humid climate, packing too tightly can also restrict airflow and increase moisture risk in a standard unit.

A 10x10 is 100 square feet and a 10x15 is 150 square feet. Choose the larger one if you are storing a dining set or a large sectional, or if you expect to visit often and need walking room inside. Walk through your inventory, measure the largest items, and ask the facility to confirm the size. Request written estimates for the same dates and the same scope so you can compare them fairly.

Size the unit by what you need to move, not by a rule of thumb. Walk through your inventory, measure the largest items, and ask the facility to confirm the size. Leaving a little extra room helps you load quickly under time pressure. Atlantic hurricane season runs June 1 to November 30, so it helps to keep a written inventory and photos of your belongings ready in advance. National Hurricane Center

No. Ask the facility to confirm the usable dimensions, because advertised size and usable space can differ. Climate-controlled units may be reached through interior corridors, so also ask about doorway width, elevators, and carts if you have very large items. Choose your size based on your inventory, not on whether the unit is climate controlled.

Cost depends on the unit size you need, whether it is climate controlled, and the facility. Compare units by usable dimensions, climate control and access. Request written rental terms covering the recurring rate, introductory offer expiry, deposits and any required coverage. Request written estimates for dates you can actually use. Keep the inventory and service scope the same so you can compare availability, minimum bookings and date-related charges.

How do you make the right size decision before calling a St. Petersburg storage facility?

Count your large furniture

List every item larger than a box before calling. Sofas, beds, tables, and appliances each consume significant floor space.

Plan to disassemble

Commit to disassembling bed frames, tables, and shelving. This can reduce the unit size you need.

Ask about ceiling height

Confirm the exact ceiling height at any facility you consider. In a 10x10, an 8-foot ceiling gives 800 cubic feet and a 7-foot ceiling gives 700.

Size up for airflow

In St. Petersburg's humidity, a unit with a walking aisle resists moisture buildup better than a tightly packed unit of the same size.

Choosing the right storage unit size in St. Petersburg is a combination of inventory math and climate awareness. The inventory walk-through gives you a starting point, the packing approach tells you how much that starting point can be compressed or expanded, and the humidity consideration argues for leaving more space than the minimum. Call (727) 328-4448 to discuss your specific inventory and get a storage-aware moving plan that accounts for both the move and whatever comes next.

Related Questions

How much does it cost to rent a storage unit?

Compare units by usable dimensions, climate control and access. Request written rental terms covering the recurring rate, introductory offer expiry, deposits and any required coverage.

Read Answer →

How do I pack a storage unit?

Proper packing sequence and humidity protection are critical in Florida's climate.

Read Answer →

Is storage included with moving?

Storage-in-transit and self-storage serve different needs at different price points.

Read Answer →
FAQ

Questions People Ask Us Before a Move

Call (727) 328-4448 or use our quote form. Estimates are free. Have your addresses, a rough list of rooms and big items, and your date handy.

Plan your move

Free quotes. Call (727) 328-4448.

Read our reviews on Google

In their words

Google reviews

Google, 4.4 from 21 reviews, 3 shown

Jean Petersen

2 years ago

Moving with "Karma Movers" was a fantastic, stress-free experience. The move was spontaneous but posed no issue for the team. The price-performance ratio was excellent, with no unexpected costs. The team arrived punctually on the agreed date, handling our belongings carefully. They were friendly, personable, and highly reliable. I would gladly choose "Karma Movers" for my next move anytime!

Owner response

a year ago

Thank you, Jean, for choosing Karma Movers for your spontaneous move. We're delighted to hear it was stress-free and that our team's friendliness and reliability stood out.

Lloyd Hammond

2 years ago

Every interaction, from arranging our move to the moving day itself, was fantastic! They kept us informed leading up to the move, which was reassuring. We ended up using their services for two moves within a month, and each time was smooth and professional. Kris, Ray, and Marc were not only courteous but also had fantastic attitudes! They were incredibly professional and hardworking on both occasions. My family and I wholeheartedly recommend Karma Movers for anyone in need of moving services!

Owner response

2 years ago

Thank you for your wonderful review! We're thrilled to hear that your experience with us was fantastic from start to finish. We appreciate your recommendation and look forward to assisting you and your family in the future!

Ellen Gonzalez

2 years ago

I am absolutely delighted to share my exceptional experience with Karma Movers, a top-tier moving company in Petersburg. From the moment I reached out to them, their professionalism and dedication to a seamless moving process were apparent. The moving team arrived on time, displaying impeccable efficiency while handling my belongings with the utmost care. What truly distinguishes Karma Movers is their commitment to customer satisfaction, evident in their transparent and fair pricing structure. If you're on the hunt for dependable movers in Petersburg, your search ends here. Karma Movers made my relocation experience stress-free, and I couldn't be happier with their outstanding service.

Owner response

2 years ago

Thank you for sharing your outstanding experience with Karma Movers! We're thrilled to have provided you with a seamless and stress-free relocation process. Your satisfaction is our top priority, and we're delighted that our professionalism, efficiency, and commitment to transparency stood out to you. We appreciate your recommendation and look forward to serving you or anyone you may refer in the future!

Read our reviews on Google

Visit us

Find Us in St. Petersburg, FL

Free estimates

Call (727) 328-4448