How to calculate the book-to-bill ratio
The book-to-bill ratio is a demand-health indicator borrowed from manufacturing and used across recurring-revenue businesses. It shows whether new orders are keeping ahead of what you are invoicing.
A ratio consistently above 1 signals a growing backlog and expanding future revenue; a ratio below 1 warns that new demand is not replacing what you are delivering and billing.
- Bookings / billings The formula
- Above 1 Demand outpaces delivery
- Below 1 Billings exceed new orders
Short answer
The book-to-bill ratio compares new orders to invoicing. Divide bookings (new orders received) by billings (amount invoiced) in a period. A ratio above 1 means you are booking more than you are billing, a sign demand is outpacing delivery and future revenue is growing. Below 1 means billings exceed new bookings.
Step by step
Total bookings
Sum new orders, or committed contract value, received in the period.
Total billings
Sum the amount actually invoiced in the same period.
Divide bookings by billings
Book-to-bill equals bookings divided by billings. Above 1 means you booked more than you billed; below 1 the reverse.
Read the trend
Track it over several periods. A sustained ratio above 1 signals growing demand and backlog; a slide below 1 warns of softening demand relative to delivery.
Worked example
In the quarter you booked 1,500,000 dollars of new orders and billed 1,200,000 dollars. Book-to-bill = 1,500,000 / 1,200,000 = 1.25.
A ratio of 1.25 means new demand is running 25 percent ahead of what you are invoicing, so backlog and future revenue are growing. If it fell to 0.9 next quarter, new bookings would be lagging billings, an early warning of a demand slowdown.
How Ardovo handles it
Ardovo tracks bookings and billings from the same deal and billing data, so book-to-bill is always current. Rook flags when the ratio dips below 1, surfacing a demand slowdown before it shows up in revenue.
Frequently asked questions
What is the book-to-bill ratio formula?
Bookings (new orders received) divided by billings (amount invoiced) in a period. A ratio above 1 means you are booking more than billing, signaling growing demand; below 1 means billings exceed new bookings.
What does a book-to-bill ratio above 1 mean?
That new orders are outpacing invoicing, so backlog and future revenue are growing. A sustained ratio above 1 is a healthy sign of expanding demand relative to what you are currently delivering and billing.
Is book-to-bill useful for SaaS?
Yes, especially where bookings and billings diverge due to billing schedules or delayed starts. It signals whether new demand is keeping ahead of delivery, complementing bookings, billings, and revenue as separate views.