SaaS Magic Number Calculator
Calculate the SaaS Magic Number — net new ARR divided by previous-quarter sales & marketing spend. Coined by Scale Venture in 2008. Above 1.0 means scale faster; below 0.75 means fix the funnel before adding budget.
SaaS Magic Number Calculator
Net new ARR this quarter
Sales & marketing spend
Sensitivity — Magic Number at different S&M spend levels
Benchmark — public SaaS Magic Numbers
How to use the SaaS Magic Number Calculator
Calculate true net new ARR for the quarter
Net new ARR = ending ARR − starting ARR for the quarter. It already nets new logos and expansion against churn and contraction, so do not subtract churn again. For example, if ARR went from $20M to $22M, net new ARR for the quarter is $2M. If you only have MRR, multiply by 12 to get ARR. Use booked, not billed — Magic Number is a sales-efficiency metric, not a cash metric.
Use the previous quarter's S&M spend
This is the part founders get wrong most often. The convention deliberately uses the prior quarter's S&M spend because sales and marketing dollars typically take one to two quarters to convert into booked ARR — a paid ad today produces a demo next month and a closed deal the month after that. Using the same quarter's S&M understates efficiency for fast-growing businesses and overstates it for businesses that just slashed budgets.
Include fully-loaded S&M, not just ad spend
Fully-loaded S&M = all sales salaries and commissions (AEs, BDRs, SEs, leadership), marketing headcount, paid ad spend, content production, demo and sales-tool subscriptions, events, allocated overhead. Founders who count only paid ads typically understate S&M by 3–5x and produce a Magic Number that looks impossibly good. Investors will always recompute with the full number — use the honest version first.
Read against the four bands and the sensitivity table
Above 1.0 is "scale faster" — pour fuel on the fire. 0.75–1.0 is "healthy, keep pace." 0.5–0.75 is "cautious, fix the funnel before scaling." Below 0.5 is "pull back hard." Then look at the sensitivity table: it shows what happens to your Magic Number if you push S&M up 25%, 50%, or 100%. That tells you how much room you have to scale before crossing into a worse band.
SaaS Magic Number — the metric that tells you whether to step on the gas
The SaaS Magic Number was coined in 2008 by Lars Dalgaard, then CEO of SuccessFactors and a venture partner at Scale Venture Partners. He needed a single ratio that would answer one question for SaaS boards staring at a fundraising decision: is the business efficient enough to justify more capital, or is it about to set fire to the next round? The formula he settled on is brutally simple. Take the net new annualised recurring revenue a company booked in a quarter, multiply by four to annualise it, divide by the sales and marketing spend from the previous quarter, and you have the Magic Number. Above 1.0, every dollar of S&M last quarter generated more than a dollar of new ARR this quarter — pour fuel on the fire. Below 0.75, the engine is sputtering and adding fuel will only stall it harder. Eighteen years later it remains the single most-cited sales-efficiency metric in SaaS board decks, IPO prospectuses, and Series B pitch meetings.
Why the one-quarter S&M lag matters
The lag is what makes the Magic Number honest. SaaS sales cycles are not instantaneous. A demand-generation dollar spent in January funds a webinar in February, which produces a demo in March, which closes as a contract in April. Using this quarter's S&M against this quarter's ARR would credit January spend with March deals it never touched, and starve recently-spent budget of the bookings still in flight. The previous-quarter convention approximates the real conversion lag without requiring the company to build a cohorted pipeline model. For most SaaS businesses with sales cycles under 90 days the one-quarter lag is close enough; for enterprise SaaS with 6-9 month cycles, sophisticated operators sometimes use a two-quarter lag instead, which produces a more flattering (and arguably more accurate) number.
Bessemer's "Net New ARR / S&M" versus Scale Venture's variants
There are at least three "Magic Number" formulas circulating in SaaS finance, and they are not identical. Scale Venture's original 2008 formula is the one we calculate above — annualised net new ARR ÷ prior-quarter S&M. Bessemer publishes a closely related variant in its State of the Cloud report that uses the same numerator but sometimes substitutes current-quarter S&M, producing a slightly lower number for growing companies. A third variant, popular among growth-equity investors, uses gross new ARR (ignoring churn) instead of net new ARR — this is misleading because it credits S&M for revenue you would have had anyway and ignores retention failures. The Scale Venture formula is the conservative, defensible one and the version every investor expects you to compute. The CAC payback shorthand — 4 ÷ Magic Number ≈ payback in months — is a back-of-envelope conversion that holds for businesses with roughly 75% gross margins; lower margins make payback longer than the formula suggests.
A Magic Number above 1 says: every dollar you spend on sales today generates more than a dollar of recurring revenue tomorrow. Raise more, spend more.
The six-quarter compression pattern
One of the unspoken truths of the Magic Number is that it almost always compresses as a company scales. The peak Magic Numbers happen early — Slack and Datadog reportedly cleared 2.0 in their Series B era, Snowflake hit above 2.0 during the 2020–21 boom — and then decline steadily through the subsequent six to ten quarters as the easiest customers are acquired, the addressable market saturates, and S&M effort shifts to harder-to-reach buyers. The right reaction is not panic but planning. Companies that recognise the pattern raise larger rounds while the Magic Number is high, deploy aggressively, and accept a glide path down toward the long-run mean of 0.7–0.8. Companies that miss the pattern keep spending at the old efficiency assumption and burn through their runway in three quarters.
The ASEAN angle — why regional SaaS Magic Numbers run lower
Singapore and Southeast Asian SaaS businesses face a structural Magic Number disadvantage. The math is unforgiving: with smaller addressable markets, less product-led pull, and longer outbound sales cycles, every dollar of S&M extracts less new ARR than its US counterpart. Carousell, Carro, and Patsnap — three of the region's better-known scaled SaaS plays — all operate against this constraint. The compensation strategies are recognisable: target higher-ARPC enterprise segments earlier than US peers would, lean harder into product-led pricing to compress CAC, and ruthlessly cut underperforming channels from year one. Regional VCs adjust expectations accordingly — a 0.7 Magic Number from a Jakarta-based SaaS is treated like a 1.0 from a comparable San Francisco peer when fundraising. The bar is not lower; it is contextualised to TAM. Founders who can articulate the regional Magic Number drag and show they are managing it actively raise more easily than those who pretend the constraint does not exist.
10 Things to Know About the SaaS Magic Number
The Magic Number was coined in 2008 by Lars Dalgaard, then CEO of SuccessFactors and a venture partner at Scale Venture Partners. He wanted a single ratio that would answer the "should we raise more?" question on a SaaS board.
The convention uses the previous quarter's S&M spend, not the current quarter's — because S&M dollars take 1–2 quarters to convert into booked ARR. Using same-quarter spend understates efficiency for growing businesses.
The shorthand 4 ÷ Magic Number ≈ CAC payback months only holds for businesses with roughly 75% gross margins. A Magic Number of 1.0 implies ~4-month payback; 2.0 implies ~2 months.
Snowflake reportedly cleared Magic Numbers above 2.0 during the 2020–21 ZIRP-era peak — one of the highest sustained ratios for a public SaaS at scale. Few companies maintain that for more than 4–6 quarters.
The Magic Number almost always compresses over time — a six-to-ten-quarter glide path from early peaks of 1.5+ down toward the long-run public-SaaS mean of 0.7–0.8 as TAM saturates and easy customers are exhausted.
Bessemer's State of the Cloud reports that top-quartile public SaaS sit near 1.0 and top-decile clear 1.5. Median public SaaS sits at roughly 0.7, well inside the "cautious" band.
There are three competing variants: Scale Venture (net new ARR ÷ prior-quarter S&M), Bessemer (sometimes uses current-quarter S&M), and growth-equity (uses gross new ARR, ignoring churn). The Scale Venture version is the conservative standard.
Investors love the Magic Number because it is a single forward-looking gauge — it answers "will the next dollar of capital work?" in a way that growth rate alone cannot. Boards use it to decide whether to approve incremental headcount and budget.
ASEAN SaaS Magic Numbers run structurally lower than US peers — smaller TAM, longer outbound cycles, and less product-led pull mean the same S&M dollar buys less new ARR. Carousell, Carro, and Patsnap all operate against this drag.
A Magic Number below 0.5 is treated by investors not as "needs more growth capital" but as "needs a turnaround" — a fundamentally different conversation. Fix the funnel before raising more, or watch the next round's valuation reset.
Frequently Asked Questions
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Above 1.0 is "scale-worthy" — every dollar of S&M produces more than a dollar of new ARR. Between 0.75 and 1.0 is "healthy, keep pace." Between 0.5 and 0.75 is "cautious — audit the funnel before adding spend." Below 0.5 is a serious efficiency problem requiring pull-back, not more capital. Top-quartile public SaaS sits near 1.0; top-decile clears 1.5.
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Because S&M dollars take time to convert. A paid ad in January funds a demo in February and a closed deal in March. Using same-quarter S&M would credit recent spend with bookings still in flight and undercount the ARR that current spend will eventually produce. The one-quarter lag is the convention Lars Dalgaard set in 2008 and it remains the standard. Enterprise SaaS with longer sales cycles sometimes uses a two-quarter lag instead.
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To annualise. A single quarter of net new ARR represents three months of sales effort and three months of customer acquisition. Multiplying by four projects what that pace would produce in a full year, putting it on the same denominator as the annualised CAC payback calculation. Without the ×4, the ratio would be quarterly-to-quarterly rather than annualised — directionally fine but not comparable to industry benchmarks, which are universally annualised.
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The shorthand is CAC payback months ≈ 4 ÷ Magic Number, valid when gross margins sit near 75%. A Magic Number of 1.0 implies roughly 4 months to recoup CAC; a Magic Number of 2.0 implies roughly 2 months; a Magic Number of 0.5 implies roughly 8 months. Lower gross margins stretch the payback further than the formula suggests — at 60% gross margin, divide 4 by your Magic Number and then multiply by 1.25 for a closer estimate.
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Scale Venture's original 2008 formula uses net new ARR ÷ prior-quarter S&M — the conservative, lagged version we calculate here. Bessemer publishes a closely related variant that sometimes uses current-quarter S&M instead, producing a slightly lower (less flattering) number for growing businesses. A third variant popular with growth-equity investors uses gross new ARR (ignoring churn), which inflates the ratio and is generally discouraged. The Scale Venture version is the defensible standard and what most VCs expect to see.
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Fully-loaded S&M, always. Include all sales salaries and commissions (AEs, BDRs, SEs, leadership), marketing headcount, paid ads, content, sales tools, demo infrastructure, events, and allocated overhead. Founders who count only paid-ad spend understate S&M by 3–5x and produce Magic Numbers that look impossibly good. Investors will always recompute with the fully-loaded number — the flattering version only sets you up for a painful diligence conversation.
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Almost every SaaS sees Magic Number compression over six to ten quarters. The earliest customers are the easiest — closest fit, fastest decisions, lowest CAC. As you scale, you must reach further into the addressable market, persuade harder-to-convince buyers, and compete with more incumbents. S&M effort per new ARR dollar inevitably rises. The right reaction is to raise larger rounds while the Magic Number is high, deploy aggressively, and accept a glide path down toward the long-run public-SaaS mean of 0.7–0.8.
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For a US Series B at standard multiples, investors typically want to see a sustained Magic Number of 0.75 or higher across 2–3 consecutive quarters, with at least one quarter above 1.0 demonstrating that the business can scale efficiently when capital is deployed. Below 0.5 closes very few Series B rounds at competitive valuations. Asian regional VCs adjust expectations slightly lower (0.5–0.75 is fundable) to account for smaller TAM, but expect the founder to articulate the structural drag explicitly.
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Smaller addressable markets, less product-led pull, longer outbound sales cycles, and more fragmented buying processes mean every S&M dollar in Southeast Asia extracts less new ARR than its US equivalent. Carousell, Carro, and Patsnap all operate against this drag — their CAC is broadly comparable to US peers (talent and ad costs are global) but their TAM is a fraction. Regional VCs adjust by treating a 0.7 Magic Number from a Jakarta SaaS roughly equivalently to a 1.0 from a San Francisco peer of similar scale.
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No. All calculation happens entirely in your browser via JavaScript — no server call, no analytics on the inputs, nothing sent over the network. Open DevTools → Network and confirm: there is zero outbound traffic from the calculator while you type.
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