Sales Efficiency Calculator — ARR Booked per S&M Dollar

Background.

A software company spends $4,000,000 on sales and marketing in a quarter and books $4,200,000 of new and expansion ARR. Read that way, each dollar of spend bought $1.05 of annual recurring revenue. In the same quarter, cancellations and downgrades took away $1,000,000 of ARR, so the business ended the quarter only $3,200,000 larger: 80 cents of kept revenue per dollar spent, or $1.25 of spend for every dollar of ARR that stayed.

Those two ratios, gross and net sales efficiency, point at different parts of the business. Gross efficiency judges acquisition: how well marketing and sales turn money into signed recurring contracts, upgrades included. The distance from gross to net is retention. In the example, 23.81 % of everything booked went to replacing revenue the company already had, a problem no amount of extra selling solves.

This is an operator's metric: it needs ARR bookings, which a company tracks internally but rarely publishes, set against the same period's sales and marketing expense. That is what separates it from the SaaS magic number, which an outsider can compute from public filings.

No standard-setter or primary source publishes a benchmark for bookings-based sales efficiency, so the result here is reported without a grade. Rules of thumb circulate, but none comes with a stated method or sample. The comparison that holds up is your own trend, quarter against quarter, at a similar mix of customers and deal sizes.

What is sales efficiency calculator?

Sales efficiency is annual recurring revenue booked in a period divided by the sales and marketing expense of that same period. The gross version counts new ARR plus expansion ARR; the net version subtracts churned and contracted ARR first. Both are dollars of ARR per dollar of spend. It is not a GAAP or IFRS measure, and companies define both halves differently, which is why the SEC's 2020 guidance on management's discussion asks a registrant that presents an operating metric to disclose how it is defined and calculated.

How to use this calculator.

1. 01Choose one period, usually a quarter, and take every figure from it. Mixing a quarter's bookings with a month's spend produces a meaningless ratio.
2. 02Enter new ARR from customers who were not customers when the period began. Leave out implementation, onboarding and professional-services fees; they do not recur.
3. 03Enter expansion ARR from existing customers adding seats or upgrading, then churned and contracted ARR as a positive amount. The calculator subtracts it for the net figure.
4. 04Enter fully loaded sales and marketing spend: salaries, commissions, benefits, advertising, events, tools and any overhead your finance team allocates to the function. Advertising alone gives a ratio several times too flattering.
5. 05Read gross and net together, then the churn share, which tells you how much of the period's selling went to standing still.

The formula.

Gross sales efficiency = (New + Exp) ÷ S&M. Net sales efficiency = (New + Exp − Lost) ÷ S&M. New is new-logo ARR, Exp is expansion ARR, Lost is churned and contracted ARR, and S&M is the period's sales and marketing expense. The churn share is Lost ÷ (New + Exp) × 100: the percentage of gross additions consumed by losses. It can exceed 100 %, and when it does net new ARR and net efficiency go negative while gross efficiency stays positive.

The reading beside the results turns the net ratio over: S&M ÷ net new ARR is what one dollar of kept ARR cost. Turned over that way it is easier to set against a budget or a customer's lifetime value than a decimal is.

The definitions of the numerator come from published ARR conventions. Andreessen Horowitz's 16 Startup Metrics says ARR should exclude one-time fees and professional service fees, and Bessemer separates ARR from the broader figure that adds non-recurring services and implementation revenue. Counting those fees as bookings inflates the ratio with money that will not repeat.

Pairing bookings with same-period spend is the metric's main simplification. When deals take months to close, this quarter's bookings were partly bought with last quarter's spend, so a quarter of heavy hiring can depress the ratio before the new reps sell anything. The magic number deals with that lag by dividing the change in quarterly revenue, annualised by multiplying by four, by the prior quarter's sales and marketing expense.

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.