Glossary term
Book-to-Bill
Book-to-bill compares new orders booked to sales or shipments billed, showing whether demand is running ahead of current fulfillment.
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What Is Book-to-Bill?
Book-to-bill is a ratio that compares the value of new orders booked during a period with the value of products shipped, billed, or recognized during that same period. It is used to read demand momentum in industries where orders arrive before revenue is delivered.
The metric is especially associated with semiconductors, semiconductor equipment, electronics, industrial machinery, aerospace, and other order-driven businesses. A ratio above 1.0 means new orders exceed current billings. A ratio below 1.0 means billings exceed new orders.
Key Takeaways
- Book-to-bill compares bookings, or new orders, with billings, or shipped/recognized sales.
- A ratio above 1.0 usually signals expanding backlog or stronger demand.
- A ratio below 1.0 can signal slowing demand, backlog drawdown, or weaker future revenue.
- The metric is most useful in industries where orders lead production and revenue.
- It should be read with backlog, cancellations, margins, capacity, and delivery timing.
Book-to-Bill Formula
The basic formula is:
New orders booked are the value of orders received during the period. Billings or shipments are the value of goods delivered, invoiced, or otherwise recognized under the company's reporting convention.
If a manufacturer books $120 million in new orders and bills $100 million in shipments, its book-to-bill ratio is 1.2. That suggests demand is running ahead of current fulfillment. If it books $80 million and bills $100 million, the ratio is 0.8, suggesting new demand is not replacing current shipments at the same pace.
How Investors Read It
A high book-to-bill ratio can suggest revenue growth ahead because the backlog may be building. But it can also signal capacity strain if the company cannot deliver on time. A low ratio may signal weakening demand, but it can also appear temporarily if a company is shipping from an unusually large backlog.
The trend matters more than one month. Cyclical industries can show noisy order patterns. Analysts often compare book-to-bill with backlog, lead times, cancellation rates, pricing, gross margins, inventory, and customer concentration to judge whether the signal is durable.
Where It Can Mislead
Book-to-bill can look strong when orders are booked far in advance, but customers may later delay or cancel. It can look weak when a company is intentionally clearing backlog. It may also be distorted by one large contract, currency changes, supply constraints, or reporting differences between companies.
For service businesses, subscription companies, and retailers, other metrics may be more useful. Book-to-bill is most informative when the order pipeline and fulfillment cycle are economically meaningful.
The Bottom Line
Book-to-bill is a demand-momentum measure for order-driven businesses. It matters because the relationship between new orders and current billings can preview future revenue, capacity pressure, and industry-cycle changes before they fully appear in reported sales.