When a publisher places a print order for 10,000 books, it is natural to expect 10,000 books to arrive at the warehouse. In practice, book manufacturing does not always work that way. Production involves multiple steps, from printing and folding through binding and finishing, and some copies may not make it through the process as finished, sellable books. That is where over/under comes into the conversation.
Over/under refers to the acceptable variation between the quantity ordered and the final quantity delivered. Depending on the printer and the terms of the job, a printer may produce somewhat more or somewhat fewer finished copies than the exact quantity ordered. For publishers, understanding how that tolerance works is important, particularly when inventory needs to be carefully planned around adoptions, school-year demand, customer commitments, or a title’s next scheduled print run.
The important thing to remember is that over/under is not the same thing as intentionally ordering extra inventory. It is a normal part of managing the realities of print production. Knowing the difference can help publishers plan their quantities more accurately and avoid building unnecessary inventory into every print order.
Why Does Over/Under Happen?
A book goes through several production stages before it becomes a finished product. During those stages, copies can be lost to setup, makeready, quality control, binding, trimming, finishing, or other production variables. A printer needs to account for those realities when planning the manufacturing process.
For example, if a publisher orders 10,000 finished books, the printer may need to run more than 10,000 copies through portions of the production process to account for expected production waste. The goal is to finish with the quantity required by the customer, within the agreed over/under tolerance.
There can also be situations where the final quantity comes in slightly below the order quantity. Rather than treating every difference as an exception, the industry generally accounts for reasonable production variation through an agreed tolerance. The specific percentage or terms can vary, so publishers should understand what their printer includes in its quote and how the final quantity is handled.
Over/Under Is Not a Reason to Automatically Add More Books to the Order
This is where the terminology can get confusing. If you need 10,000 books, you do not necessarily need to place an order for 10,500 simply because your printer has an over/under allowance. The printer’s production tolerance and your inventory planning are two separate decisions.
The over/under allowance addresses the quantity that can reasonably be produced and delivered from a manufacturing run. Your print quantity should be based on how many finished copies you actually expect to need.
That distinction matters when inventory is tight. If a publisher is trying to avoid overordering, the goal should be to determine the quantity that makes sense based on actual demand, current inventory, and the timing of the next opportunity to reprint. The printer’s over/under policy should then be factored into that expectation rather than treated as additional inventory that automatically needs to be added to every order.
How Much Over/Under Is Typical?
There is not one universal over/under percentage that applies to every book printer or every job. The allowable variation can depend on the printer, the type of work, the quantity, the manufacturing process, and the terms agreed upon when the job is quoted.
That is why it is worth asking about over/under when comparing print quotes. Two printers may quote the same base quantity but handle production tolerances differently. One may have a specific percentage built into its terms, while another may handle quantities differently depending on the job.
Publishers should also find out whether they are billed for the actual quantity delivered, the quantity ordered, or according to another arrangement outlined in the printer’s terms. Those details can affect both the final cost of the job and the number of books that ultimately go into inventory.
Think About Over/Under When You Plan Inventory
The real value of understanding over/under comes when you connect it to inventory planning.
Suppose you are expecting demand for 10,000 copies of a title. You have 2,000 copies already in the warehouse, another 1,000 committed to existing orders, and a new print run will take several weeks to produce and deliver. The decision is not simply whether to print 10,000 more copies. You need to look at how much inventory you actually need to cover expected demand until the next replenishment opportunity.
This is where historical sales data becomes useful. If a title has consistently sold at a certain rate, that history can help establish a reasonable print quantity. If demand is seasonal, you may need to account for a higher sales period. If the title is tied to a school adoption or known customer order, those commitments should be considered differently from an uncommitted sales forecast.
The same thinking applies in the other direction. If a title has been selling slowly and there is already substantial inventory on hand, adding a large quantity to the next print order simply to create a cushion may leave you with books sitting in the warehouse long after they were needed.
Consider the Cost of Being Short
Avoiding overordering does not mean trying to keep inventory as low as possible in every situation. There are times when carrying some additional inventory makes sense.
A stockout can be particularly disruptive for educational publishers. A title may be needed for a new school year, a course launch, a curriculum adoption, or a customer’s scheduled shipment. If the title is unavailable, the cost may go beyond the lost sale. It could mean expedited freight, a rushed production schedule, a delayed customer order, or an opportunity that cannot be recovered once the selling window has passed.
That is why the right print quantity is a balance. You are weighing the cost and risk of carrying additional inventory against the cost and consequences of running short. Over/under is one part of that equation, but it should not determine the entire print quantity.
Don’t Use the Same Approach for Every Title
A blanket rule such as “always print 5% over forecast” may be easy to apply, but it does not necessarily reflect how different titles behave.
An established textbook with several years of reliable sales history may have a very different inventory profile from a new workbook launching into an uncertain market. A seasonal curriculum title may need additional coverage before its peak selling period, while a slow-moving backlist title may be better managed with smaller, more frequent print quantities.
The more predictable the demand, the easier it is to make a print decision based on actual history. When demand is less certain, publishers may need to put more emphasis on customer commitments, upcoming sales opportunities, reprint lead times, and the potential consequences of being out of stock.
Ask Your Printer How Its Over/Under Policy Works
Over/under is one of those details that can be easy to overlook when a publisher is focused on getting a quote, meeting a production deadline, or comparing unit pricing. It is worth asking a few straightforward questions before placing the order.
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What is the allowable over/under percentage?
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Is the tolerance different depending on quantity or product type?
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Will you be billed based on the quantity ordered or the quantity actually delivered?
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How will an underrun be communicated?
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If additional copies are produced, how are those copies handled?
Understanding those terms upfront removes some of the uncertainty from inventory planning and makes it easier to compare quotes on an apples-to-apples basis.
The Bottom Line
Over/under is a normal part of book manufacturing, not a reason to automatically increase every print quantity. The printer is accounting for the realities of production, while the publisher is making a separate decision about how many finished books the business actually needs.
The best print planning takes both into account. Start with expected demand, look at inventory already available, consider committed orders and seasonal fluctuations, and understand how long it will take to produce the next run. Then make sure you know how your printer’s over/under terms affect the final quantity and cost.
A little planning upfront can make it easier to avoid two common problems: having too many books sitting in inventory or finding out you need a reprint sooner than expected.
