Shelf counts, order quantities

June Loves Author

A 6-foot shelf with a 25 mm centre divider leaves 1.80 m of usable run — enough for roughly 60–95 trade paperbacks or 95–140 mass-market paperbacks. For stock quantities, order 1.5–2 times the copies sold in the same period last year and reorder when 2–3 weeks of average sales remain. The rest of this page is the working: formats, fit counts, print runs and ISBN checks.

Formats, spines and fit counts for a 6 ft shelf with 1.80 m of usable run
Format or display	Size
Trade paperback	135 × 216 mm (5.25 × 8.5 in)
Mass-market paperback	110 × 178 mm (4.25 × 7 in)
Hardcover, 6 × 9 in	152 × 229 mm
Spine-out display	one spine width per title
Face-out display	one cover width per title
Face-out, 30 cm title	300 mm face
Face-out, 13 cm slimline	130 mm face

Terms used at the shelf

Trade paperback: The larger paperback format, about 135 × 216 mm (5.25 × 8.5 in) and 250–450 pages. A block of that length stands 15–28 mm thick on the shelf.
Mass-market paperback: The compact rack format, about 110 × 178 mm (4.25 × 7 in) and 175–300 pages. Slimmer spines push the fit count to 95–140 per 1.80 m of run.
Usable run: The shelf length left after dividers are subtracted. A 1.83 m shelf with a 25 mm centre divider has about 1.80 m of usable run.
Face-out: Display with the cover facing the browser. It costs 0.13–0.30 m of run per title and cuts what a metre holds from about 30 titles to about 10.
Remainder: In-print surplus stock, traded at 40–60% off cover price. A remainder is a different price band from a first printing, not a cheap copy of one.
Reorder point: The stock level at which a title goes back on order: 2–3 weeks of average sales, checked weekly.

How many paperbacks fit on a 6-foot shelf?

Roughly 60–95 trade paperbacks or 95–140 mass-market paperbacks, on the 1.80 m of run a divided 6 ft shelf actually offers.

Start with the run, not the shelf. A 1.83 m (6 ft) shelf with a 25 mm centre divider leaves about 1.80 m of usable run; every fit count on this page is reckoned against that 1.80 m, not against the nominal 6 ft.

Then divide by the spine. A 250–450 page paperback block stands 15–28 mm thick, which is why the trade count lands in a band rather than a single number: 1,800 mm of run at 15–28 mm a copy gives 60–95 books. Mass-market stock, slimmer again, reaches 95–140.

Format swings the count harder than any other choice. Between the thickest hardcover spines (25–40 mm) and the slimmest mass-market, a shelf's book count varies roughly threefold — the full workings sit in the format table at /book-format-sizes.

A delivery day, hour by hour

Durations rather than dates: the six checks above run from the morning a carton lands to the weekly reorder review.

A map of this guide's sections

How many copies of a title should you stock?

For a new title, 1.5–2 times the copies sold in the same period of the previous year; reorder when 2–3 weeks of average sales remain on the shelf.

The working stock rule pegs the opening order to history: take the copies sold in the same period of the previous year and multiply by 1.5–2. The multiple covers the display copy, the browser's copy and the one in the reading room without tying up cash in a full carton.

The reorder point is a time buffer, not a pile: when on-hand stock equals 2–3 weeks of average sales, the title goes back on order. Counted weekly, that window absorbs a slow week and a busy one without a gap on the shelf.

Second-hand buying uses the same arithmetic in reverse: the price bands — out-of-print at 3–10× cover, remainders at 40–60% off, current hardcovers at 30–50% off — tell you what a copy is worth before you decide how many of it the run can hold. The step-by-step version is at /how-many-books-fit-on-a-shelf.

The signature mark of this site, drawn as a plate

From carton to shelf: the counting procedure

Six checks in order, from the morning the delivery lands to the weekly reorder review — each one named for the failure it catches.

Run the checks in the order below; each is cheaper than the mistake it prevents. The timings are working timings — morning, same day, weekly — because stock errors compound by the day, not by the month.

Two of the six catch money errors: a short-shipped carton signed as complete, and a remainder priced as a first printing. The other four catch space errors, and a space error surfaces as a shelf that will not take the delivery it was planned for.

Delivery morning — count cartons against the invoice before signing. Failure caught: the short shipment signed off as complete.
Within the hour — validate every ISBN's mod-10 check digit. Failure caught: the mis-keyed ISBN that becomes a double order.
Same day — sort by format: trade, mass-market, hardcover. Failure caught: the shelf plan built for one format and filled with another, at a threefold swing in count.
Same day — separate first printings, reprints and remainders. Failure caught: the remainder priced as a first printing.
Before shelving — measure the run each section needs at 15–28 mm per trade spine. Failure caught: face-out creep, where faced titles quietly take 0.13–0.30 m each.
Weekly — compare on-hand counts with the 2–3 week reorder point. Failure caught: the silent sell-out, noticed only when a reader asks.