Styling guide
Books by the Foot: How to Measure Your Shelves
Books by the foot are sold by how much shelf they cover, not by how many titles are in the box. That makes ordering simple once you know your measurements. This guide shows you exactly what to measure, how to account for stacks and objects, and how to turn your numbers into an order.
What "by the foot" actually means
A linear foot is 12 inches of books standing upright, spines out, side by side. One foot of books fills 12 inches of shelf, whether it contains eight thick volumes or fourteen thin ones. Typical counts are roughly 8 to 12 average hardcovers per foot; the full reasoning is in how many books per foot of shelf.
What you need
- A tape measure (a metal one is easiest inside cabinets)
- Your phone's notes app or the worksheet below
- Five minutes per bookcase
Step 1: Measure inside width
Measure from inside wall to inside wall of each shelf, in inches. Don't measure the outside of the bookcase; side panels can steal an inch or more per shelf.
If your shelves are all the same width, measure one and count them. Built-ins are often slightly different from side to side, so measure each.
Step 2: Measure height
Measure from the shelf surface to the underside of the shelf above. You need the tallest books to stand upright with about an inch to spare so they can be pulled out without catching.
- Most everyday hardcovers stand under about 10 inches tall, but not all do. If a shelf is shorter than about 9 to 10 inches, plan on horizontal stacks there instead of upright runs.
- Very tall shelves (14 inches or more) can look empty above upright books. Use horizontal stacks or objects to fill the vertical space.
Step 3: Measure depth
Depth matters most for horizontal stacks. A book lying flat needs a shelf at least as deep as the book is wide, often around 6 to 9 inches for standard hardcovers. Shallow picture ledges and some kitchen shelves are too shallow for flat stacks; plan upright runs there.
Step 4: Decide how much space is for books
Before you divide by 12, subtract space for anything that isn't an upright book:
| Element | Typical shelf space (approx.) |
|---|---|
| Pair of bookends | 4-6 in |
| Vase, plant or lamp | 6-10 in |
| Horizontal stack (3-5 books) | 6-9 in (the width of its largest book) |
| Breathing room / empty gap | 4-12 in |
Or use a simple fill percentage:
- Packed library look: about 90-100% books
- Styled shelves: about 60-70% books
- Staging and airy shelves: about 50-60% books
Step 5: Do the math
Feet to order = (total inside width in inches x fill percentage) / 12, rounded up
Worked example: living-room bookcase
- 5 shelves x 31 inches = 155 inches
- Styled at 65%: 155 x 0.65 = about 101 inches
- 101 / 12 = 8.4, so order 9 feet
Worked example: fireplace built-ins
- Two built-ins, each 4 shelves x 36 inches = 288 inches
- Staging at 55%: 288 x 0.55 = about 158 inches
- 158 / 12 = 13.2, so order 14 feet
Worked example: a single floating shelf
- One 48-inch floating shelf, one upright run and one stack with a plant
- Books on about 50% = 24 inches = 2 feet
Measuring tricky spaces
- Cube organizers: measure one opening's inside width and height and multiply by the number of cubes you want to fill. Leave some cubes for baskets or objects.
- Corner shelves: measure along the back edge of each wall, then subtract the depth of the corner, where books can't sit fully.
- Shelves with face frames: measure the clear opening, not the shelf board behind it.
- Sloped or stair shelves: measure each tread separately.
Measuring in centimeters?
One foot is 30.48 cm, so divide your total in centimeters by about 30.5 to get feet. An 80 cm shelf is about 2.6 feet wide; at a styled 65% fill, that's roughly 1.7 feet of books, so round up to 2.
Measuring coffee tables, mantels and consoles
These surfaces get stacks, not feet:
- Measure the surface length and depth.
- Plan one stack per 3 to 4 feet of length, placed about a third of the way in from one end.
- Check depth. A stack needs a surface at least as deep as its largest book is wide, often about 6 to 9 inches for standard hardcovers. Narrow mantel shelves sometimes can't take a flat stack; use a short upright run with a bookend instead.
- Check height clearance under art, a mirror or a TV. Leave a few inches between the top of the stack (or its topper) and the frame.
A five-book shelf stack is the usual unit. See coffee table book stacking ideas and mantel book styling.
Planning a whole house (staging or a rental)
When you're furnishing several rooms at once, measure every surface and total by color:
| Room | Surface | Inside width | Fill % | Feet | Color |
|---|---|---|---|---|---|
| Living | Bookcase, 5 x 30 in | 150 in | 55% | 7 | Cream 5 / tan 2 |
| Living | Coffee table | n/a | n/a | One 5-book stack | Cream |
| Office | Floating shelves, 2 x 36 in | 72 in | 50% | 3 | Navy 2 / cream 1 |
| Bedroom | Dresser top | n/a | n/a | One 5-book stack | Cream |
| Total | 10 ft + 2 stacks | Cream 6, tan 2, navy 2 |
Totaling by color lets you order in 2-foot lots where possible.
Splitting your total into colors and lot sizes
Once you have a total, split it with the 60-30-10 rule (main, support, accent), then round each color to lot sizes of 1 or 2 feet:
| Total | Main (60%) | Support (30%) | Accent (10%) |
|---|---|---|---|
| 5 ft | 3 ft (2 + 1) | 2 ft | Use a shelf stack |
| 8 ft | 5 ft (2 + 2 + 1) | 2 ft | 1 ft |
| 10 ft | 6 ft (2 + 2 + 2) | 3 ft (2 + 1) | 1 ft |
| 15 ft | 9 ft | 4 ft | 2 ft |
Measuring mistakes to avoid
- Measuring the outside of the case instead of the inside opening.
- Forgetting face frames on built-ins, which narrow the usable opening.
- Skipping height. Books that won't stand upright have to be stacked, which changes your plan.
- Assuming every shelf is the same. Built-ins and older bookcases often vary by an inch or two.
- Planning 100% fill for a styled look. Leave space for objects and air unless you want a library wall.
- Not rounding up. A little extra becomes a coffee-table stack; a shortfall leaves a gap.
Check the shelf can take the weight
Measuring tells you how many feet fit. It doesn't tell you whether the shelf can hold them. As a rough estimate, a foot of 10 to 12 hardcovers can weigh about 10 to 15 pounds or more, so a fully loaded 36-inch shelf may carry 30 to 45 pounds. Built-ins and solid bookcases handle that easily. For floating shelves, wall-mounted ledges and long, thin spans:
- check the rated capacity of the shelf and its brackets,
- mount into studs or with anchors rated for the load,
- keep the heaviest runs near the supports.
More in how to style built-ins and floating shelves.
A two-minute shortcut
No time to measure every shelf? Measure one shelf's inside width, count the shelves, multiply, and use 60% as your fill. For most styled bookcases that gets you within a foot of the careful answer.
Your worksheet
Copy this into your notes app:
| Shelf | Inside width (in) | Height (in) | Depth (in) | Fill % | Feet |
|---|---|---|---|---|---|
| 1 | |||||
| 2 | |||||
| 3 | |||||
| 4 | |||||
| 5 | |||||
| Total |
Before you order: what to check
The easiest way to avoid a box that doesn't suit your shelf is to know what you're getting. Check these before you buy from any seller:
- Is color sorted by spine or cover? Spine is what shows on a shelf. Covers may differ.
- What's the condition? New, like-new and used all look different up close.
- How tall are the books? Make sure they fit your shortest shelf.
- Where does the seller ship, and what does shipping cost? Books are heavy.
- What's the return policy? Know before you open the box.
For River Birch Books, the answers are: color is sorted by spine; condition is "Good used condition: clean and intact, with light shelf wear possible."; shipping is free to the continental U.S. (we don't ship to Alaska, Hawaii, U.S. territories, APO/FPO addresses or internationally); and returns are accepted within 90 days, with the buyer paying return shipping and no restocking fee.
Choosing feet by color
Once you have a total, split it by palette. A common approach is about 60% main color, 30% supporting color and 10% accent. For a calm, neutral room that might be Dunes cream and ivory with Driftwood tan and brown; for coastal, mix in Tidewater navy and blue. For older cloth spines, the Vintage-Look 2 ft lot covers two feet at once. See books by color for decorating for full palettes.
Order by the foot
With your measurements in hand, head to the books by the foot shop. Lots come in 1-foot and 2-foot sizes, plus 5-book coffee-table stacks, all shipping free to the continental U.S.
Frequently asked questions
What does 'books by the foot' mean?
It means books are sold by how much shelf they cover, measured along the spines, rather than by a set number of titles. One linear foot fills 12 inches of shelf when the books stand upright side by side.
How do I measure a shelf for books by the foot?
Measure the inside width of each shelf in inches, add the shelves together, subtract space you want for objects and gaps, and divide by 12. Also check shelf height so your books will stand upright.
How many books come in a foot?
It varies with thickness, typically roughly 8 to 12 average hardcovers. That's why reputable sellers sell by length rather than promising an exact count.
What should I check before buying books by the foot?
Check whether color is sorted by spine or by cover, typical book height, condition, where the seller ships, and the return policy, so you know what you'll get and what happens if it doesn't suit your shelf.
