SaaS Magic Number Calculator — Quarterly Sales Efficiency
Enter 4 quarters of ARR and S&M spend — get your Magic Number, Burn Multiple overlay, Bessemer threshold gauge, 8-quarter trend, and a shareable scorecard. No signup.
Last reviewed: April 2026
SaaS Magic Number Calculator
Measure your GTM efficiency. The Magic Number tells VCs whether your S&M spend is generating scalable ARR growth.
Quarter Inputs
| Quarter | Ending ARR ($) | S&M Spend ($) | Net Burn ($) | |
|---|---|---|---|---|
Burn Multiple
Sales Velocity (ARR/$SM)
0.80xNet New ARR: $1.6M
Bessemer GTM Gauge
Magic Number Trend
Quarterly MN with Q5 projected via linear regression. Zone bands: red (kill), amber (optimize), teal (scale carefully), emerald (scale harder).
| Quarter | Magic Number | Burn Multiple | Sales Velocity | Payback (mo) | Verdict |
|---|---|---|---|---|---|
| Q2 2026 | 3.33 | 3.00 | 0.67x | 3.6 mo | SCALE HARDER |
| Q3 2026 | 3.20 | 2.92 | 0.67x | 3.8 mo | SCALE HARDER |
| Q4 2026 | 3.56 | 2.25 | 0.80x | 3.4 mo | SCALE HARDER |
6-Dimension Report Card
Magic Number
Burn Multiple
Sales Velocity
Payback Period
Scale Readiness
Investor Appeal
What-If Simulator
Adjust inputs to model different GTM scenarios on the latest quarter.
Combined impact →
Reverse Calculator
Net New ARR needed per quarter
$500KScenario A vs B
Save your current inputs as Scenario A or B, then compare.
What Is the SaaS Magic Number?
The Magic Number measures go-to-market efficiency: how much ARR growth you generate per dollar of Sales & Marketing spend. A Magic Number of 1.0 means you recover your S&M investment in one quarter. Coined by Lars Dalgaard and popularized by Bessemer Venture Partners, it has become a benchmark metric for SaaS investors evaluating scaling readiness.
How to Calculate the Magic Number
MN ≥ 1.0
Scale Harder
Top-quartile efficiency. VCs love to see this. Pour fuel on the fire.
MN 0.75–1.0
Scale Carefully
Approaching efficient growth. Incremental S&M increases are safe.
MN 0.5–0.75
Optimize
Below threshold. Fix unit economics before scaling.
MN < 0.5
Kill It
Poor efficiency. Stop spend, fix retention and pricing first.
What Is the Burn Multiple?
Coined by David Sacks, the Burn Multiple measures how much cash a company burns per dollar of net new ARR. A Burn Multiple below 1.0 is exceptional; above 2.5 is a red flag for most investors. It complements the Magic Number by showing cash efficiency alongside S&M efficiency.
Frequently Asked Questions
What is a good Magic Number for SaaS?
A Magic Number ≥ 1.0 is considered excellent and a signal to scale S&M aggressively. Between 0.75 and 1.0 is healthy. Below 0.5 typically means pausing or restructuring GTM before adding spend.
How often should I calculate the Magic Number?
Quarterly — it uses quarter-over-quarter ARR growth. Some teams track it monthly for early signals, but quarterly is the standard used by Bessemer and most SaaS-focused VCs.
What does a Magic Number greater than 1.5 mean?
A MN above 1.5 is exceptional and suggests your S&M engine is firing on all cylinders. It often indicates strong product-market fit, high LTV, or an efficient channel mix (e.g., product-led + outbound).
What is the difference between Magic Number and Burn Multiple?
The Magic Number measures S&M efficiency (ARR growth per S&M dollar). The Burn Multiple measures overall cash efficiency (total burn per ARR growth dollar). Both together give a complete picture of GTM and operational efficiency.
Can the Magic Number be negative?
Yes — if ARR is declining (negative net new ARR), the Magic Number is negative. This is the Kill verdict: your go-to-market spend is not growing revenue, and additional S&M spending will only accelerate losses.
How does gross margin affect the Magic Number?
The standard Magic Number formula does not include gross margin. However, the gross-margin-adjusted version (used in the What-If simulator) multiplies net new ARR by gross margin percentage before dividing by S&M, giving a more accurate view of true unit economics.
What S&M spend should I include?
Include all fully-loaded sales and marketing costs: salaries, commissions, tools, advertising, events, and agency fees. Some teams also include a portion of Customer Success if it drives expansion ARR.
How does the Burn Multiple relate to runway?
A high Burn Multiple means you are spending more cash per unit of growth, reducing runway. A Burn Multiple of 2.0x with $5M net new ARR implies $10M in quarterly cash burn — four such quarters at that rate would require substantial reserves or a new funding round.
How the Magic Number Formula Works
The SaaS Magic Number was introduced by Scale Venture Partners around 2008 and later adopted by Bessemer Venture Partners as the canonical sales efficiency metric for growth-stage SaaS. It answers a single question: for every dollar of S&M investment, how many dollars of annualized new ARR did we generate?
Magic Number Formula
MN = (ARR_Q4 − ARR_Q3) × 4 ÷ SM_Q3
×4 annualizes the quarterly net new ARR. Prior-quarter S&M in the denominator reflects the industry convention that this quarter's ARR results from last quarter's investment.
Example
Q3 ARR $5.2M → Q4 ARR $6.8M. Net new ARR $1.6M × 4 = $6.4M annualized. Q3 S&M spend $1.8M. Magic Number = $6.4M ÷ $1.8M = 3.56. Well above the Bessemer "scale harder" threshold.
The ×4 annualization matters because S&M spend is typically tracked annually in budgets and investor reports. A quarterly net new ARR of $400K equates to $1.6M annualized — a very different number for budgeting discussions than the raw $400K figure. The formula normalizes both numerator and denominator to annual equivalents, making Magic Number directly comparable to ARR multiples and LTV:CAC ratios used in the same board decks.
Bessemer Magic Number Thresholds (0.5 / 0.75 / 1.0)
Bessemer Venture Partners popularized four actionable zones that link the Magic Number directly to a scaling decision. These are the thresholds used in the Bessemer State of the Cloud report, and they have become the standard reference for VC-backed SaaS companies worldwide.
Your sales motion generates > $1 of annualized ARR per $1 of S&M. Increase investment aggressively — the ROI justifies it.
The motion is working. Scale investment, but monitor efficiency closely. Fix any weak points before accelerating.
Improve ICP, close rates, and onboarding before increasing spend. Scaling an inefficient motion compounds waste.
The unit economics are broken. Cutting S&M and focusing on product-market fit is almost always the right move here.
The 0.75 threshold is particularly important because it accounts for the gross margin on the $0.75 of ARR. At 75% gross margin, $0.75 of ARR generates $0.56 of gross profit — still positive after accounting for SaaS cost of goods. Below 0.5, even with 80% gross margin, the returns are marginal relative to the investment risk.
Magic Number vs Burn Multiple — Why You Need Both
The Magic Number and the Burn Multiple answer different questions. VCs and board members triangulate both because a company that optimizes one while ignoring the other can mask serious problems.
The TikTok insight: a Magic Number of 0.9 (looks fine) paired with a Burn Multiple of 3.4 (very bad) means the sales motion is mediocre but the company is hemorrhaging cash on non-sales expenses. This is the sign of a "grow at all costs" culture that has not yet had its efficiency reckoning. Both metrics together paint the complete picture.
Quarterly Sales Efficiency Ratio, Explained
The quarterly sales efficiency ratio (QSER) is the non-annualized version of the Magic Number: net new ARR this quarter ÷ S&M spend this quarter. The distinction between QSER and the Magic Number matters when comparing across companies with different reporting conventions.
QSER of 0.25 × 4 = Magic Number of 1.0. Many founders confuse the two when reading Bessemer essays that quote "Magic Number of 1.0" as the threshold — if you compute QSER without the ×4 and compare it to the Bessemer threshold, you will think your efficiency is 4× worse than it is. This calculator uses the correct annualized Magic Number formula throughout.
The 4-quarter grid in this calculator lets you track trend, not just snapshots. A single quarter is noise — it can be inflated by a large deal signed in week one of the quarter or deflated by a holiday-heavy close period. Four quarters of data reveals the underlying trajectory, which is what matters for investment decisions.
Magic Number Benchmarks by Funding Stage (Seed, Series A, Series B)
Based on Bessemer State of the Cloud 2024 data, OpenView 2024 SaaS Benchmarks, and SaaStr efficiency reports, here are the Magic Number benchmarks by stage:
Snowflake filed its S-1 with a trailing 4-quarter average Magic Number of approximately 1.4. Datadog's was around 1.2. Klaviyo's was approximately 1.1. These are the real-world benchmarks the Bessemer thresholds are calibrated against. The median VC-backed SaaS company is closer to 0.6–0.8 — most companies never clear 1.0 consistently, which is why it's the elite zone.
Participating vs Non-Participating S&M Expense Treatment
A common Magic Number mistake is inconsistent S&M expense treatment. The denominator should include only the expenses directly tied to acquiring new customers — not customer success (retention), renewals management, or account management for existing customers.
Include in S&M: Sales rep salaries and OTE, SDR salaries, sales management salaries (pro-rated), marketing programs, paid acquisition spend, demand gen headcount, brand spend, conference sponsorships, and PR costs when tied to pipeline generation.
Exclude from S&M: Customer success managers (CSMs) focused on retention, renewal AEs (unless tied to new logo expansion), account management, and post-sale implementation. These costs belong in a separate retention efficiency calculation. Misclassifying CSMs as S&M artificially deflates your Magic Number — the most common self-deceiving mistake in SaaS finance.
What "Is My Magic Number Good?" Actually Means
"Good" depends on three contextual factors: your funding stage, your burn rate, and your trend direction. A Magic Number of 0.8 at Series A with a declining trend is a warning sign. The same 0.8 at Series A with an improving trend for 3 consecutive quarters is a buy signal.
The Burn Multiple adds the second dimension. A Magic Number of 0.8 with Burn Multiple of 0.9 is exceptional — you're nearly at the "scale harder" threshold with almost no incremental burn per dollar of new ARR. A Magic Number of 0.8 with Burn Multiple of 4.0 means the sales motion is mediocre and the overall company is burning cash at an unsustainable rate.
The trend line in the 4-quarter chart is often more important than the current number. A company improving from 0.4 → 0.6 → 0.9 → 1.1 is a Series B story. A company stuck at 0.7–0.8 for 6 quarters is showing market saturation or a capped ceiling in its current GTM. Use the 8-quarter projection in this tool to extrapolate your efficiency trajectory.
Frequently Asked Questions
What is the SaaS Magic Number formula?
Magic Number = (Current Quarter ARR − Prior Quarter ARR) × 4 ÷ Prior Quarter S&M Spend. The ×4 annualizes quarterly net new ARR. A Magic Number of 1.0 means $1 of annualized new ARR generated per $1 of S&M invested.
What is a good Bessemer Magic Number threshold?
Bessemer thresholds: > 1.0 = scale harder, 0.75–1.0 = scale carefully, 0.5–0.75 = optimize first, < 0.5 = stop and fix unit economics. Above 1.0 is elite territory — the median VC-backed SaaS company achieves 0.6–0.8.
What's the difference between Magic Number and Burn Multiple?
Magic Number measures sales motion efficiency (how much ARR per $1 of S&M). Burn Multiple measures total capital efficiency (net burn ÷ net new ARR). Magic Number can look fine while Burn Multiple is terrible if R&D or G&A spend is out of control. VCs use both together.
How is sales efficiency ratio calculated for SaaS?
Quarterly sales efficiency ratio = net new ARR ÷ S&M spend (same quarter). Magic Number adds ×4 annualization. Both are shown in this calculator's 6-dimension scorecard under "Magic Number" (annualized) and "Sales Velocity" (raw ratio).
What is a good Burn Multiple for a Series A SaaS?
Sacks benchmarks: < 1.0 = amazing, 1.0–1.5 = great, 1.5–2.0 = OK, 2.0–3.0 = suspect, > 3.0 = bad. Series B investors typically want Burn Multiple < 1.5. The median Series A SaaS company runs 1.8–2.5.
What's a healthy Magic Number at Series A?
MN > 0.75 at Series A is healthy — the sales motion is working and worth scaling. MN > 1.0 at Series A is exceptional and justifies accelerating investment. Below 0.75, focus on ICP and sales playbook before increasing spend.
How does sales efficiency vary by funding stage?
Seed: MN 0.4–0.8, any positive validates the sales motion. Series A: MN 0.6–0.9, top quartile > 1.0. Series B: MN 0.8–1.2, investors expect > 1.0. Series C+: consistency across 4+ quarters matters more than a single peak.
Is my Magic Number good?
Above 1.0 is excellent. 0.75–1.0 is healthy — scale carefully. 0.5–0.75 means optimize before scaling more. Below 0.5 means the unit economics need repair. Use the What-If Simulator to see what changes (lower S&M, higher close rate, larger deal size) move you to the next zone.
What does Magic Number 0.75 vs 1.0 actually mean?
MN 0.75 = $0.75 of annualized new ARR per $1 of prior S&M spend (75% return). MN 1.0 = $1.00 of new ARR per $1 of S&M (100% return). Above 1.0, S&M investment generates net positive returns immediately — the reason Bessemer calls it "scale harder."
How do you calculate quarterly sales efficiency ratio?
QSER = net new ARR this quarter ÷ S&M spend this quarter. Magic Number = QSER × 4 (annualized), using prior-quarter S&M in the denominator. Enter your 4 quarters of ARR and S&M spend above to compute both automatically.
What is net new ARR per S&M dollar?
Net new ARR per S&M dollar = (ending ARR this quarter − ending ARR last quarter) ÷ S&M spend last quarter. This is the raw Sales Velocity metric. Multiply by 4 for the annualized Magic Number. Both are shown in the 6-dimension scorecard.
Should I use current-quarter or prior-quarter S&M in the denominator?
Industry convention (Bessemer, Scale VP, OpenView) uses prior-quarter S&M. Rationale: SaaS sales cycles span 1–3 months, so this quarter's ARR results from last quarter's pipeline investment. This calculator uses prior-quarter S&M consistently.