Cost of Sales Ratio

The cost of sales ratio, or cost of sales percentage, is a cost divided by revenue, times 100. In B2B SaaS it means sales cost as a share of the revenue that cost won. In accounting it means cost of goods sold as a share of revenue. Same math, different cost on top, so say which one you mean. Updated October 2026: both formulas up front, the gross margin link for the accounting version, and a clear split between this page and the calculator.

This page explains what the percentage means and what to compare it with. To work out the number from your own books, use the cost of sales calculator, which has separate tabs for goods, SaaS cost of revenue and the cost of selling.

This page leads with the operator view: what it costs to sell a dollar of ARR. The accounting view gets its own column below, because many readers search the same words for it. For which costs go on which line, see cost of sales vs cost of goods sold.

What Does Cost of Sales Percentage Mean?

It means one of two ratios, and both use the same words. Pick the column that fits your question.

How Do You Calculate the Cost of Sales Ratio?

Divide the cost by the revenue it is matched to, then multiply by 100. The division is easy. The hard part is the match. To run each version on your own numbers, use the cost of sales calculator.

``` Cost of sales ratio (accounting) = Cost of goods sold / Revenue x 100 Cost of sales ratio (cost of selling) = Fully loaded sales cost / New and expansion ARR x 100 ```

The accounting version is the mirror of gross margin. For example, a business with a 70% gross margin has a 30% cost of sales ratio in the accounting sense. The rest of this section covers the cost of selling version, because that is where the inputs are harder to pin down.

Fully loaded sales cost includes base salary, commission paid, benefits and taxes, sales management, sales engineering, enablement, and the tooling the selling org uses. It excludes marketing program spend, which belongs in customer acquisition cost, and excludes hosting and support, which belong in cost of goods sold. On the P&L, this sales cost sits in the sales and marketing line, the selling half of SG&A.

You will see three versions of the bottom line:

- Sales cost over total revenue. This is the P&L view. It is easy to pull from the books, but it mixes in renewals the sales team never worked. - Sales cost over new and expansion ARR. This is ORM's default. It matches the cost to the revenue that cost won in the same period. - Sales and marketing cost over new customer ARR. Benchmarkit calls this the New CAC Ratio. It adds marketing and leaves out expansion.

A worked example

One company, one year. These numbers are illustrative, made up to show the math.

How Does the Cost of Sales Ratio Relate to CAC, Magic Number and Sales Efficiency?

They share the same cost and change what sits below it. The cost of sales ratio is the sales-only slice. CAC adds marketing. Sales efficiency and the magic number flip the ratio over to show revenue per dollar spent.

- CAC divides sales and marketing cost by the number of new customers won. It is the same cost, counted per customer. Run your own numbers in the CAC calculator. - CAC ratio divides sales and marketing cost by new ARR. Benchmarkit's 2025 median New CAC Ratio is $2.00 per $1.00 of new customer ARR, and the bottom quartile spends $2.82. Its median Expansion CAC Ratio is $1.00 (Benchmarkit, 2025). - Sales efficiency is new ARR divided by sales and marketing cost, the same ratio upside down. In the example, $10.0M of new and expansion ARR over $9.0M of spend is about 1.1. Scale Venture Partners puts the long-term median near 0.7 (Scale VP). - Magic number is the change in quarterly revenue times 4, divided by the prior quarter's sales and marketing cost. It adds a lag, so spend is judged against the revenue it later produced.

One thing falls out of the Benchmarkit medians: a new-logo dollar costs twice what an expansion dollar costs. A shift in mix toward expansion lowers the ratio with no change in the sales team. Split the ratio by new and expansion before you judge the team.

What Is a Good Cost of Sales Percentage?

There is no single good number, because the versions differ. For SaaS sales and marketing as a share of revenue, Benchmarkit's 2025 survey puts the median at 37%. VC-backed firms run 47% and PE-backed firms run 33% (Benchmarkit, 2025).

A sales-only ratio sits below those, since marketing is out. To plan the ratio before the year starts, build it into the sales budget from heads, commissions and the bookings target. For the accounting version, there is no cross-industry norm worth quoting. A reseller and a software firm live in different worlds. Track it against your own gross margin.

The peer number matters less than two things: your trend, and which side of the ratio moved.

Why the ratio drifts

Four mechanisms move this number without anyone deciding to move it.

How Do You Lower the Cost of Sales Ratio?

Raise what each sales dollar produces before you cut the dollars. Cutting heads after a pricing hit makes the next period worse.

Start with capacity. Assigned quota is what you ask a rep to sell. Productive quota is what you should expect from them at their point on the ramp. Build ramp curves by role and region instead of one company average, then plan hires so capacity is ready before the revenue is due.

ORM sets this up as a math problem: hit the bookings target at the lowest sales cost, or get the most bookings from a fixed budget. Pete Furseth says that done well, this cuts sales cost by roughly 10 to 15% for the same target, or adds 10 to 15% more productive capacity for the same spend. Even moving from a one-year to a two-year capacity plan can cut cost by about 5%. You see the shortage early enough to hire and ramp for it.

What Should You Compare the Cost of Sales Ratio Against?

The cost of sales ratio is a cost question. It cannot tell you whether the pipeline that produced the bookings was healthy, so pair it with pipeline coverage and win rate. A stable ratio built on a falling win rate means reps are working more deals for the same output, and that pattern breaks the moment headcount stops growing.

Track the ratio on a rolling four-quarter basis rather than quarter by quarter. Single quarters carry hiring lumps and seasonality that swamp the underlying trend, and the fix you would apply to a real deterioration is different from the fix you would apply to a hiring class that has not ramped. For the forecasting side of the same question, see sales forecasting.

Reading the ratio when it moves

Cost of sales ratio moves when either the numerator or the denominator moves, and the two have different owners. Diagnosing which side moved comes before any decision about spend.

Which Revenue Belongs in the Denominator?

Use the revenue the selling team produced in the period: new plus expansion bookings. Leave out renewals run by a separate customer success team, unless that team's cost is also on top. Match the revenue to the cost that won it.

Plans built on the ratio often use pipeline value instead, and that breaks it. Most deals close for less than the amount recorded in the CRM. And only about 20 percent of the pipeline dated to close inside a quarter actually closes in it.

Where open pipeline averages twice what closed-won averages, a forward-looking cost of sales ratio built on pipeline is understating true cost by roughly half. Derive a realization factor from your own closed-won history and apply it before using pipeline anywhere in the calculation.

See which sales velocity lever moves first and why your pipeline average deal size lies.