Records Box Calculator: Linear Feet to Cartons, Cubic Feet and Shelving
Measure your files in linear feet, pick letter or legal, set your shelving, and see how many record storage cartons, shelves and units the job needs.
Dana WhitcombLast checked | Record storage cartons | 8Standard carton, about 15 × 12 × 10 in. |
|---|---|
| Volume | 8 cubic feet |
| Boxes per shelf | 3One row, 12 in ends facing out. |
| Shelves needed | 3 |
| Shelving units | 1 |
A full carton of paper weighs roughly 30 to 40 lb. Check shelf ratings and, for a whole room of shelving, the floor load with whoever looks after the building.
Ten linear feet of letter-size files fill about eight standard record storage cartons, which is about eight cubic feet of records, and on 36-inch shelving those cartons need three shelves of one unit. The rule of thumb behind it (one carton is about one cubic foot and holds about 15 inches of letter files or 12 inches of legal files) carries most office moves, storage contracts and records room plans. The calculator above runs it for any volume, for letter or legal files and for the shelving you have.
How to use it
- Measure the files in linear feet: a tape measure along each drawer or shelf, first folder to last, with the folders upright and gently pressed together as they would sit in a box. Measure rather than count drawers, because few drawers are truly full.
- Choose letter or legal. If a series mixes the two, measure each size and run the tool twice.
- Enter the shelf width in inches and the number of shelves per unit.
The result shows cartons, cubic feet, cartons per shelf, shelves needed and shelving units.
Linear feet and cubic feet
Records managers measure paper two ways. Linear feet is the length of the files along the shelf or drawer, the natural unit when you stand in front of a cabinet. Cubic feet is volume, the unit records centers, storage vendors and many retention reports use because it describes boxes and space. The standard carton links the two: it is about one cubic foot and holds about one linear foot of legal files or about a foot and a quarter of letter files.
Bound volumes, maps, plans, oversize ledgers and media don't fit this conversion. Count them separately and house them on their own terms.
The standard record storage carton
The workhorse is a corrugated carton about 15 by 12 by 10 inches outside, with a lift-off lid and hand holes. That is 1,800 cubic inches, a little over the 1,728 in a cubic foot, hence the one-cubic-foot convention. Packing habits that keep the numbers honest:
- Stand folders upright, never flat, and leave about an inch of slack so a folder can be pulled.
- Put one records series with one destruction date in each box, so the carton can be destroyed or transferred on a single day. This adds boxes the calculator doesn't count, and it is worth it.
- Label the 12-inch end that faces the aisle: series, date range, destruction date, box number.
A full carton is heavy, often 30 pounds or more, so keep the heaviest boxes at waist height.
Letter versus legal
Both sizes fit the same carton, turned different ways. Letter folders, a little under 12 inches wide, face the 12-inch end and run along the 15-inch length, so a carton takes about 15 inches of letter files. Legal folders, nearly 15 inches wide, face the long side and run across the 12-inch width, so a carton takes only about 12 inches of legal files. The same length of legal files therefore needs more cartons. Keep the sizes in separate boxes, and if your office has both, run two calculations and add the results.
Shelving and floor loading
A 36-inch shelf takes three cartons side by side, 12-inch ends facing the aisle. Deeper shelves can hold a second row, but the calculator counts one row to stay conservative, and back-row boxes are the ones nobody finds. Keep the bottom shelf a few inches off the floor so a leak or a wet mop can't reach the cartons.
Floor loading needs a qualified opinion before you fill a room. Paper is dense, and a shelving unit concentrates dozens of cartons on a small footprint. Building codes set far higher design loads for library stack rooms and file rooms than for ordinary offices, and compact mobile shelving raises the load again. Ask a structural engineer or your building official before turning a spare upper-floor office into a records room, and anchor tall units so they can't tip. Our guide to storage equipment and supplies for permanent records covers shelving and housings in more depth.
Worked example
The default inputs are 10 linear feet of letter-size files, 36-inch shelves and 6 shelves per unit.
| Step | Calculation | Result |
|---|---|---|
| Cartons | 10 linear ft at about 15 in (1.25 linear ft) per carton | 8 standard record storage cartons (about 1 cu ft each, 15 × 12 × 10 in) |
| Volume | 8 cartons at about 1 cu ft | 8 cu ft |
| Per shelf | 36 in shelf, 12 in per carton | 3 boxes per shelf |
| Shelves | 8 cartons at 3 per shelf, rounded up | 3 shelves |
| Units | 3 shelves on 6-shelf units | 1 shelving unit |
Switch to legal and the same 10 linear feet comes out at 10 cartons, because a carton holds only about 12 inches of legal files.
Limits
The tool assumes the standard carton, one row per shelf and files packed with normal slack. It doesn't add boxes for splitting series, handle oversize material or estimate weight. Before boxing anything, run the files against your retention schedule; shelving records already past their destruction date wastes money. Our piece on writing a retention schedule departments will actually follow covers that step, and the how long to keep records tool gives the tax baseline for household and small-business papers.
Frequently asked questions
How many linear feet fit in a records box?
A standard record storage carton holds about 15 inches of letter-size files or about 12 inches of legal-size files, with an inch of slack for pulling folders.
What is the difference between linear feet and cubic feet?
Linear feet measures the length of files along a shelf or drawer; cubic feet measures volume. A 15 by 12 by 10 inch carton is about one cubic foot, so for legal files the two numbers match, and letter files run about a quarter more linear feet than cubic feet.
How many records boxes fit on a shelf?
Three on a 36-inch shelf, with the 12-inch ends facing out. A 42-inch shelf also takes three, since the tool rounds down to whole boxes.
Do I need special shelving for records boxes?
Ordinary steel shelving works, but check the rated load per shelf and the floor under it, keep the lowest shelf off the floor and anchor tall units.