Unit EconomicsIntermediate6 min read

SaaS Quick Ratio

SaaS Quick Ratio, framed by Tomasz Tunguz (Theory Ventures, formerly Redpoint), measures the quality of your ARR growth by comparing what you GAINED (new + expansion) against what you LOST (contraction + churn). Formula: Quick Ratio = (New ARR + Expansion ARR) ÷ (Churned ARR + Contraction ARR). A Quick Ratio of 4 means you added $4 for every $1 you lost. The KnowMBA POV: net new ARR and revenue growth tell you the score; Quick Ratio tells you HOW you got there. A company with great net growth but a Quick Ratio of 1.2 is treading water — they're acquiring as fast as they're leaking, which breaks the moment growth slows.

Also known asQuick RatioSaaS Growth QualityTunguz Quick RatioARR Quick Ratio

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The Trap

The trap is celebrating positive net new ARR while ignoring leaky churn. Two companies both add $1M net new ARR. Company A: $1.2M new + $0.3M expansion + $0.5M churn = Quick Ratio 3. Company B: $4M new + $1M expansion + $4M churn = Quick Ratio 1.25. Both report '$1M net new ARR' but Company B is a leaky bucket — they spent 4x the S&M to net the same. When growth slows for any reason, Company B collapses while Company A continues compounding.

What to Do

Calculate Quick Ratio quarterly. Tunguz's tiers: >4 'best in class', 2-4 'healthy', <2 'leaky bucket — fix retention before growth.' If Quick Ratio is below 2, churn is your real problem, not pipeline. Adding more sales effort while churn is high is pouring water into a leaky bucket. Diagnose: is churn product-led (poor fit), pricing-led (hostile renewals), or onboarding-led (failed activation)? Fix the leak before scaling acquisition.

Formula

Quick Ratio = (New ARR + Expansion ARR) ÷ (Churned ARR + Contraction ARR)

In Practice

Tomasz Tunguz published the Quick Ratio framework around 2014 after analyzing dozens of SaaS companies' growth quality. He observed that companies with Quick Ratios above 4 raised follow-on rounds at substantially better terms — even at lower top-line growth — than companies with high growth and low Quick Ratios. The lesson stuck: by the early 2020s, Quick Ratio was standard in SaaS investor due-diligence packages. The data point that drove adoption: among Tunguz's analyzed cohort, no company with sustained Quick Ratio below 2 reached $100M ARR profitably.

Pro Tips

01
Quick Ratio above 4 is the magic threshold for venture funding quality. Below 2 is a fundability problem regardless of growth rate. Between 2-4 is the typical range — improvement here moves valuation more than equivalent growth-rate improvement.
02
Decompose Quick Ratio: high expansion ARR (numerator) is healthier than high new ARR alone, because expansion has near-zero CAC. A Quick Ratio of 4 made up of 3 new + 1 expansion is good; 2 new + 2 expansion is great.
03
Track the trend more than the absolute. A Quick Ratio falling from 4 to 2.5 over four quarters signals churn acceleration even if you're 'still healthy.' The derivative matters.

Myth vs Reality

Myth

“Quick Ratio and Net Dollar Retention are the same metric”

Reality

Net Dollar Retention measures only the existing customer base (expansion - churn ÷ starting ARR). Quick Ratio includes new customer acquisition. Two different denominators, two different questions. Both belong on the dashboard.

Myth

“High Quick Ratio means you're fine”

Reality

A startup with $1M new ARR and $0 churn has 'infinite' Quick Ratio — but that's because they're too small to have churn yet. Quick Ratio matures as a meaningful signal once you have a base of >100 customers and 12+ months of cohort data.

Try it

Run the numbers.

Pressure-test the concept against your own knowledge — answer the challenge or try the live scenario.

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Knowledge Check

Quarterly numbers: $3M new ARR, $1M expansion ARR, $0.5M contraction, $1.5M churn. What's your Quick Ratio?

Industry benchmarks

Is your number good?

Calibrate against real-world tiers. Use these ranges as targets — not absolutes.

SaaS Quick Ratio (Tunguz Framework)

B2B SaaS at $5M+ ARR (needs cohort base to be meaningful)

Best in Class

> 4.0

Healthy

2.0-4.0

Leaky Bucket

1.0-2.0

Negative Growth

< 1.0

Source: Tomasz Tunguz / Theory Ventures (originally Redpoint, ~2014)

Real-world cases

Companies that lived this.

Verified narratives with the numbers that prove (or break) the concept.

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Tomasz Tunguz / Theory Ventures

2014-present

success

Tomasz Tunguz introduced SaaS Quick Ratio in his Redpoint blog around 2014, after analyzing dozens of SaaS companies and noticing that quality-of-growth predicted long-term success better than growth rate alone. The framework became standard SaaS investor diligence by 2018-2020, and is now in virtually every Series B+ board deck. Tunguz's data: among the cohort he analyzed, sustained Quick Ratio above 4 correlated more strongly with reaching $100M ARR than any other single metric — including raw growth rate.

Framework Origin

~2014 (Redpoint)

Adoption

Standard by 2018-2020

Predictive Threshold

Sustained QR > 4

Net new ARR is the headline; Quick Ratio is the underlying truth. Two companies with the same growth rate can have wildly different odds of compounding to $100M.

Source ↗

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Hypothetical: $25M ARR Late-Stage SaaS

2023

success

Hypothetical: A vertical SaaS at $25M ARR was growing 60% YoY — a number the board celebrated. New analyst on the team calculated Quick Ratio: 1.8. Investigation showed: $14M new + $4M expansion = $18M growth, against $9M churn + $1M contraction = $10M loss. Net $8M (the headline 60% growth). They were spending S&M to acquire double the ARR they actually netted. Pause-and-fix cycle: 90 days on retention, churn dropped from 36% to 22%, Quick Ratio rose to 3.2, and 12 months later growth was 50% but on a much higher quality base.

Reported Growth

60% YoY

Quick Ratio (initial)

1.8

Annual Churn (initial)

36%

Quick Ratio (12mo later)

3.2

Growth rate without Quick Ratio is half the story. The bucket may be filling, but if it's leaking faster than you realize, scaling fixes nothing.

Decision scenario

The Quick Ratio Wake-Up Call

Your $30M ARR SaaS is growing 70% YoY — board loves it. CFO calculated SaaS Quick Ratio for the first time: 1.9. Churn ran 28% last year. Pipeline for next quarter is strong but you have decisions to make about whether to push gas or fix the bucket.

ARR

$30M

Annual Growth

70% YoY

Quick Ratio

1.9

Annual Gross Churn

28%

S&M Spend (annual)

$22M

Decision 1

Adding more S&M without addressing churn means each new customer acquired faces the same product/onboarding issues that drove the 28% churn — you'll repeat the leak. But pausing growth investment means giving up market share to faster competitors.

Push growth — add 6 more AEs, hit 100% YoY growth target. Tackle churn next year when there's more revenue to fund retention investment.Reveal

Growth hits 95% YoY (close to target). Churn rises to 33% (more customers in poor-fit segments). Quick Ratio drops to 1.4. By Q3 next year, board insists on cuts. You fire 4 of 6 new AEs. The 'growth at all costs' year cost $6M and produced no permanent ARR lift — net new ARR after churn was barely better than scenario where you'd fixed the bucket first.

Quick Ratio: 1.9 → 1.4Annual Churn: 28% → 33%S&M Spend (year): +$6M, no permanent lift

90-day pause: freeze sales hiring, deploy CS team on top 50 at-risk accounts, redesign onboarding for new customers, introduce lighter pricing tier for at-risk segments. Then resume aggressive sales hiring once Quick Ratio hits 3.0.Reveal

Churn drops from 28% to 17% within two quarters. Quick Ratio reaches 3.4 (best in class). When you resume aggressive S&M after 6 months, every new customer compounds because they don't immediately leak out the bottom. Year-end: ARR growth is 75% YoY (slightly higher than starting point, much higher quality). Series C term sheet is 25% better than peers because of the rare 'high growth + best-in-class quality' profile.

Quick Ratio: 1.9 → 3.4Annual Churn: 28% → 17%Series C Multiple: +25% vs peers

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