What is spend as a percent of revenue?
Spend as a percent of revenue expresses any spending line as a share of the revenue it supports. It works for sales and marketing, research and development, or general and administrative costs.
It is a scaling check. Tracking a category of spend against revenue shows whether that spend is growing in proportion to the business or pulling ahead of it.
The formula.
Spend as a percent of revenue = (the spend line divided by revenue) times 100. Use the same period for both, and pick one category at a time for a clean read.
The same calculation answers very different questions depending on the input. Sales and marketing as a percent of revenue speaks to go-to-market efficiency; R&D as a percent speaks to investment in the product.
A worked example.
A company spends 40,000 on sales and marketing against 100,000 in revenue. Spend as a percent of revenue is 40,000 divided by 100,000, times 100, which is 40%.
What is a good level?
It depends entirely on the category and the stage. Early-stage SaaS routinely spends a high share of revenue on sales and marketing to grow, while mature companies spend far less, so there is no fixed target.
This ratio is the top-down view; the bottom-up view is cost per customer. Reading it against the blended efficiency of marketing shows whether a high spend share is actually buying efficient growth.
How to read it.
Watch the direction. A spend category rising as a share of revenue is only a concern if it is not buying proportional growth, so always pair the ratio with what the spend produced.
For sales and marketing specifically, shifting spend toward channels that compound lowers the ratio over time. Organic search is spend that compounds instead of recurring.