Bookshelf calculator
How many books do I need?
Quick answer: shelf inches × fullness ÷ 12 = feet of books, and a foot holds about 10–12 books. A styled 30-inch, five-shelf bookcase needs about 8 feet (80–96 books).
Your result
About 9 ft of books
- Shelves
- 5 × 36 in. = 180 in. of shelf
- Look
- Styled (about 60% full)
- Books needed
- 108 in. ≈ 90–108 books
- Lot mix (Dunes)
- 4 × 2 ft lots + 1 × 1 ft lot
- Total
- $589.95 with free shipping
Each Buy button checks out one lot, so that’s 5 checkouts. Mixing colors? Split the feet, for example 60% main palette and 40% accent. Titles vary.
Not sure which palette? Take the quiz →
Calculated at https://riverbirchbooks.com/bookshelf-calculator
Common setups
| Setup | Fullness | Feet | About how many books |
|---|---|---|---|
| One 30 in. floating shelf | 60% | 2 ft | 20–24 |
| Five-shelf, 30 in. bookcase | 60% | 8 ft | 80–96 |
| Five-shelf, 36 in. bookcase | 60% | 9 ft | 90–108 |
| Pair of 36 in. built-ins, 5 shelves each | 60% | 18 ft | 180–216 |
| Staged five-shelf, 30 in. bookcase | 50% | 7 ft | 70–84 |
| Full library wall: 8 × 36 in. shelves | 75% | 18 ft | 180–216 |
Feet are rounded to whole feet with a little tolerance. Measure the inside width of each shelf. Need more detail? Read how to measure shelves and how many books per foot, or print the free shelf styling cheat sheet.
The formula
Shelf width (in.) × number of shelves × fullness ÷ 12 = feet of books
Feet of books × 10–12 = about how many books
Fullness is how much of each shelf you want covered by books. Styled shelves are usually about 0.6 (60 percent), with the rest left for objects and breathing room. Staged listings often go lighter, around 0.5. A shelf packed edge to edge is 1. Round up to whole feet: a little extra becomes a coffee-table stack, while coming up short leaves a gap.
Worked examples
A single 36-inch shelf
One 36-inch shelf, styled at about 60 percent: 36 in. × 0.6 = 21.6 in., ÷ 12 ≈ 2 ft of books, or about 20–24 books. In lots: 1 × 2 ft lot, $129.99 at standard palette prices with free shipping.
A six-shelf built-in
A built-in with six 36-inch shelves, styled: 216 in. × 0.6 = 129.6 in., ÷ 12 ≈ 11 ft of books, or about 110–132 books. In lots: 5 × 2 ft lots + 1 × 1 ft lot, $719.94 at standard palette prices with free shipping.
How many books to fill a bookcase
A five-shelf, 30-inch bookcase packed full: 150 in. × 1 = 150 in., ÷ 12 ≈ 13 ft of books, or about 130–156 books. In lots: 6 × 2 ft lots + 1 × 1 ft lot, $849.93 at standard palette prices with free shipping.
The same five-shelf, 30-inch bookcase styled at 60 percent needs about 8 feet, roughly 80–96 books. That’s why most styled bookcases need fewer books than people expect.
Books per foot by book type
| Book type | About how many per foot |
|---|---|
| Average hardcovers (our lots) | 10–12 |
| Slim novels and thin hardcovers | 12–16 |
| Large art, reference or coffee-table books | 6–8 |
These are approximate, because thickness varies from book to book. That’s why our lots are sold by length: 1 foot covers about 12 inches of shelf, usually 10–12 books, and 2 feet about 24 inches, usually 20–24 books.
Measuring tips
- Measure the inside width of each shelf, between the uprights, not the outside of the bookcase.
- Check the shelf height. Books should stand upright with a little room to spare. On short shelves, stack them flat instead.
- Subtract space for anything that stays, such as a lamp, a speaker or a pair of bookends.
- Mixing colors? Split your total feet, for example 60 percent main palette and 40 percent accent. The palette quiz can suggest the pair.
When you have your number, choose a palette and order books by the foot. Each Buy button checks out one lot, so a 5 ft order is two 2 ft lots and one 1 ft lot, in three checkouts.
Questions, answered
How many books do I need for a bookshelf?
Multiply the total shelf width in inches by how full you want it (about 0.6 for a styled look), then divide by 12 to get feet. A foot of shelf holds about 10–12 books, so a styled 30-inch, five-shelf bookcase needs about 8 feet, or roughly 80–96 books.
How many books are in a foot?
About 10–12 hardcover books standing upright, depending on thickness.
How full should a styled bookshelf be?
Styled shelves are usually half to two-thirds full, leaving room for objects and open space. Staged listings often go lighter, around half full.
Do I have to buy one palette?
No. Split the feet across two or three palettes, for example 60% main color, 30% supporting and 10% accent.
Why shop with us
- Free shippingContinental U.S. & D.C., included in every price.
- 30-day returnsNo restocking fee. Buyer pays return shipping.
- Real hardcoversSorted by spine color. Good used condition.
- TrackingEmailed on every order. Secure Stripe checkout.