Rack Dimensions: Converting Feet, Inches and Centimetres
- 28/10/2026
- Posted by: tendou
- Category: Racking System
Online rack listings often describe shelf units in feet and inches, while the product’s actual dimensions may be stated in centimetres or millimetres. This guide provides the conversion factors, a ready reference table and practical advice for checking whether a rack fits your intended space.
Conversion factors
Two conversions cover the common units used in rack product descriptions:
- 1 foot = 0.3048 metres = 30.48 cm
- 1 inch = 2.54 cm
These are exact international definitions, confirmed by NIST Special Publication 811 (the US National Institute of Standards and Technology guide to SI conversion factors).
Quick reference table: feet to centimetres
On a phone, swipe the table sideways to see all columns.
| Feet | Centimetres | Metres |
|---|---|---|
| 2 ft | 60.96 cm | 0.6096 m |
| 3 ft | 91.44 cm | 0.9144 m |
| 4 ft | 121.92 cm | 1.2192 m |
| 5 ft | 152.40 cm | 1.5240 m |
| 6 ft | 182.88 cm | 1.8288 m |
| 7 ft | 213.36 cm | 2.1336 m |
| 8 ft | 243.84 cm | 2.4384 m |
Each value is the exact mathematical conversion. For mixed measurements, convert the feet and inches separately and add the results. For example, 5 ft 6 in = 152.40 + 15.24 = 167.64 cm.
Nominal size versus actual product dimensions
A seller may describe a rack as a “4-foot shelf” or a “6-foot boltless rack”. This is a nominal name, not a measured specification. The actual external dimensions of the assembled unit may differ from the round-number description.
Three dimensions matter when you buy a storage rack:
- Overall external dimensions: the finished width, depth and height of the assembled unit, including upright posts and any protruding hardware
- Clear usable space: the width and depth between the uprights where goods actually sit; this may differ from the external dimensions depending on the design
- Room and access requirement: the floor area the unit occupies plus space needed to load, unload and walk past it
Always check the product’s actual specifications in the listing or data sheet rather than relying on the nominal name. A “4-foot rack” from two different manufacturers may have different overall widths.
Worked fit comparison
This is an illustrative example to show how to check whether a rack fits a measured space. It is not a safe installation or layout approval; verify your specific situation on site.
On a phone, swipe the table sideways to see all columns.
| Item | Value |
|---|---|
| Available wall space (measured) | 250 cm |
| Rack listed as | “4-foot boltless rack” |
| Conversion: 4 ft | 121.92 cm |
| Actual product width (from spec sheet) | 120 cm |
| Two units side by side | 240 cm |
| Remaining gap | 10 cm |
The 10 cm gap is the leftover space after placing two units. Whether that gap is sufficient for assembly access, wall clearance and the items stored depends on the specific situation. This comparison tells you the physical fit; it does not confirm the arrangement is suitable for the load, the wall condition or the room’s use.
Common mixed-unit conversions
On a phone, swipe the table sideways to see all columns.
| Imperial | Centimetres |
|---|---|
| 12 in (1 ft) | 30.48 cm |
| 18 in (1.5 ft) | 45.72 cm |
| 24 in (2 ft) | 60.96 cm |
| 36 in (3 ft) | 91.44 cm |
| 48 in (4 ft) | 121.92 cm |
| 60 in (5 ft) | 152.40 cm |
| 72 in (6 ft) | 182.88 cm |
Where this is useful for Hyperack products
Hyperack’s boltless rack range includes units for household storage, storerooms and retail display, available in the 100 kg, 200 kg and 400 kg per level series. If you are comparing these against a listing described in feet or inches, use the conversion table above to compare like for like, and check the actual product specification for exact dimensions.
For help measuring the space where the rack will go, see the stockroom measurement guide. To collect all the information needed before requesting a quotation, download the Hyperack Racking Quotation Brief (PDF).
Frequently asked questions
Why do some rack listings use feet while the product is in centimetres?
Feet and inches are common in informal descriptions and marketplace listings, even in countries that use the metric system. Always confirm the actual dimensions from the product specification rather than the listing title.
Is a “4-foot rack” exactly 121.92 cm wide?
Not necessarily. “4-foot” is a nominal description. The actual assembled width may be slightly more or less. Check the product specification for the exact figure.
How do I measure the space for my rack?
Measure the available floor width, depth and height in centimetres or millimetres. Compare these against the product’s actual external dimensions, not the nominal name. Allow space for assembly access and for loading and unloading items. For a detailed guide, read How to measure a stockroom for racking layout.
How do I ask Hyperack about the right size?
Use Hyperack’s contact page with your space measurements and what you need to store. The team can advise which unit fits and confirm the actual product dimensions.