Sales Efficiency Calculator — ARR Booked per S&M Dollar

Background.

Sales efficiency asks a single question: how much annual recurring revenue did a dollar of sales and marketing buy? Divide the ARR booked in a period by the sales and marketing spend of that same period and you have the gross figure. Subtract churn and contraction first and you have the net figure, which is the one that describes what the business actually kept. A company booking $3,000,000 of new ARR and $1,200,000 of expansion against $4,000,000 of S&M spend, while losing $1,000,000 to churn and downgrades, has gross sales efficiency of 1.05 and net sales efficiency of 0.80 — $1.25 of sales and marketing bought each dollar of net new ARR.

The gap between those two numbers is the point of computing both. Gross efficiency of 1.05 says the acquisition engine converts spend into bookings at slightly better than parity. Net efficiency of 0.80 says that after retention takes its share, the same spend produces only eighty cents of durable ARR. Just under a quarter of gross additions — 23.81% — went to replacing revenue the company already had. A business can have a perfectly good sales team and a bad net number, and the two ratios read together are what separate an acquisition problem from a retention one.

One thing this page will not do is tell you whether your number is good. Unlike the SaaS magic number, which carries Lars Leckie's published 0.75 and 1.5 levels from 2008 and Scale Venture Partners' own 0.7x baseline, no primary authority publishes a benchmark for the bookings-based sales-efficiency ratio. Figures do circulate — 1.0 is often quoted as the line — but none traces to a source that states its methodology, so this calculator states the result and its reciprocal in plain dollars and declines to band it. If you want a benchmarked cousin, use the magic number page, and read its thresholds as what they are: two investors' opinions with a publication date.

The distinction from the magic number is worth being precise about, because the two are often confused. This page is the operator's version: it uses ARR bookings that only the company can measure, paired with the same period's spend. The magic number is the analyst's version: it uses the change in recognised quarterly revenue, annualised by multiplying by four, over the previous quarter's spend — every input available from a public filing. Neither can be computed from the other's inputs, they will disagree for any company whose bookings and recognised revenue diverge, and that is every growing subscription business.

Two definitional cautions belong beside the result rather than behind it. First, only recurring ARR belongs in the numerator: a16z states that ARR "should exclude one-time (non-recurring) fees and professional service fees", and Bessemer draws the same line, so implementation and services revenue must not be counted as bookings here. Counting them inflates the ratio with money that will not repeat. Second, the S&M figure should be fully loaded — salaries, commissions, benefits, advertising, events, tooling and allocated overhead. A ratio computed against advertising spend alone is not comparable to one computed against a full S&M line, and the difference is usually larger than any real change in efficiency the metric would otherwise detect.

What is sales efficiency calculator?

Sales efficiency is the ratio of annual recurring revenue booked in a period to the sales and marketing expense of that same period. In its gross form the numerator is new ARR plus expansion ARR; in its net form churned and contracted ARR are subtracted first. A gross ratio of 1.05 means a dollar of sales and marketing produced $1.05 of gross ARR bookings; a net ratio of 0.80 means the same dollar produced 80 cents of ARR the company kept. It is an internal operating metric, because ARR bookings are not disclosed in financial statements — which distinguishes it from the SaaS magic number, an outside-in approximation built from recognised revenue in public filings. Sales efficiency is not a GAAP or IFRS measure, is not defined by any standard-setter, and — unlike the magic number — has no benchmark published by a primary source. It is closely related to, but not the same as, the CAC ratio and CAC payback period: those normalise by customer counts or by gross-margin-adjusted revenue per customer, while sales efficiency normalises by ARR dollars alone.

How to use this calculator.

1. 01Pick a period and use it consistently for both numerator and denominator. A quarter is the usual choice for enterprise businesses; a month works for high-velocity ones. Mixing periods is the fastest way to produce a meaningless number.
2. 02Enter new ARR booked in the period — recurring revenue from customers who were not customers at the start. Exclude implementation, onboarding and professional-services fees, which are not recurring.
3. 03Enter expansion ARR from existing customers upgrading or adding seats.
4. 04Enter churned and contracted ARR as a positive amount. It is left out of the gross ratio and subtracted for the net one.
5. 05Enter fully loaded sales and marketing spend for the same period — salaries, commissions, benefits, advertising, events, tooling and allocated overhead. Not advertising alone.
6. 06Read gross and net together. Gross tells you whether the acquisition engine works; the gap to net tells you how much retention is giving back.
7. 07Treat the number as a trend, not a grade. There is no sourced threshold for this ratio, so its value is in how it moves quarter over quarter and how it compares against your own history at the same segment mix.

The formula.

Gross sales efficiency divides the sum of new and expansion ARR by the period's sales and marketing spend. Net sales efficiency subtracts churned and contracted ARR from that numerator first. The churn-offset percentage divides the lost ARR by gross additions, showing what share of the period's bookings went to replacing revenue the business already had; it exceeds 100% when losses were larger than everything booked, which the calculator reports rather than clamping. All arithmetic is carried at full decimal precision and rounded only at the return boundary, to two decimal places for ratios and percentages and two for currency. One consequence of that display rounding is worth knowing if you reconcile figures by hand: two-decimal ratios do not compose. Doubling the spend on the worked example gives a true gross efficiency of 0.525, which renders as 0.53 — not half of the 1.05 shown at the original spend. The underlying arithmetic is exact; only the rendered value is rounded. The text reading branches on the sign of net new ARR, evaluated after rounding, so it never contradicts the figure displayed beside it: positive periods state how many dollars of S&M bought one dollar of net new ARR, a zero period states that churn consumed the whole of gross additions, and a negative period says explicitly that gross and net must be read together because the acquisition engine may be working while retention is not.

A worked example.

Frequently asked questions.

References& sources.

1. [1]Jordan, J., Hariharan, A., Chen, F., & Kasireddy, P. (21 August 2015). "16 Startup Metrics." Andreessen Horowitz. Governs what may enter the numerator: ARR "should exclude one-time (non-recurring) fees and professional service fees", and "counting bookings" of non-recurring items is named as a classic error. Retrieved 29 July 2026; quotes verified against the live page.
2. [2]Deeter, B. (2 October 2012). "The five accounting metrics for cloud companies." Bessemer Venture Partners Atlas. Independent second authority on the same recurring/non-recurring boundary: "ARRR is the ARR, plus any non-recurring revenue related to items such as professional services, transactions, and implementations." Retrieved 29 July 2026; quote verified.
3. [3]Leckie, L. (4 March 2008). "Magic Number for SaaS Companies." Guest post on Will Price's blog. Cited on this page as the nearest metric that DOES carry published thresholds — "below 0.75 … step back", "above 1.5 call me immediately" — and to define precisely how the magic number differs from the ratio computed here. Retrieved 29 July 2026; formula and thresholds verified verbatim.
4. [4]Scale Venture Partners. "SaaS Metrics: A History of the Magic Number." Source for the alternative 0.7x baseline and for why an outside-in metric built on recognised revenue exists at all: public SaaS companies do not disclose internal ARR bookings. Retrieved 29 July 2026.
5. [5]U.S. Securities and Exchange Commission (30 January 2020). Release No. 33-10751, "Commission Guidance on Management's Discussion and Analysis of Financial Condition and Results of Operations." Requires a registrant presenting an operating metric to disclose its definition and method of calculation — relevant because what counts as "sales and marketing spend" varies materially between companies. sec.gov returns HTTP 403 to automated fetchers; release identifiers verified independently.