360 cm of shelving, mixed books
At 3 cm per book, 360 cm of shelf holds about 120 books.
Book shelf capacity calculator
How many books fit on a shelf? Add up your shelf lengths, set your average book thickness, and this book shelf capacity calculator gives the count.
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Use positive measurements and valid numbers.
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BOOKS · SHELFBooks that fit
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yours
Do you need more shelving?
Hand-picked for this exact result — no generic lists.
Shelve them like a librarian.
Total usable shelf length divided by average book thickness — the whole formula.
- Measure a real 20-book stack.
Paperbacks and hardcovers differ wildly; a measured average beats any guess.
- Count every shelf.
Add up all shelves the books will actually occupy — not the bookcase's footprint.
- Leave a finger of air.
Books packed drum-tight are miserable to pull out.
- Got a Billy?
See exactly how many books fit in a Billy bookcase for IKEA-specific math.
Worked example
One concrete case, with the assumptions spelled out.
ƒ(x)
books = floor(total shelf length ÷ average thickness)Related calculators
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