Calculate your burn multiple — net cash burn divided by net new ARR — the capital efficiency metric VCs use to evaluate how efficiently you're converting spending into growth.
Burn Multiplelt;1× is exceptional; 1–1.5× good; 2–3× acceptable;
Burn Multiple is one of the most important capital efficiency metrics in SaaS.
It was popularized by David Sacks and measures how much you're spending to
generate each dollar of net new ARR.
The formula
Burn Multiple = Net Cash Burn ÷ Net New ARR
At $3M annual net burn and $2M net new ARR: Burn Multiple = 1.5×
This means you spend $1.50 in cash to generate $1 of recurring revenue.
Net burn vs gross burn
Gross burn: Total cash spent per period (all expenses)
Net burn: Gross burn minus revenue collected
Burn Multiple uses net burn because it accounts for the revenue you're
already collecting. A company at $5M gross burn but $3M in revenue
collection has $2M net burn — and the burn multiple reflects actual
capital efficiency.
Burn Multiple benchmarks
Burn Multiple
Interpretation
< 0
Generating ARR faster than burning cash — exceptional
0–1×
World-class capital efficiency
1–1.5×
Excellent — top quartile
1.5–2×
Good — acceptable for rapid growth
2–3×
Borderline — investors will flag at Series B
> 3×
Concerning — significant capital efficiency problem
Why burn multiple matters more than burn rate alone
A $500k/month burn rate tells you nothing without context. Is it generating
$500k/month in new ARR, or $100k/month? The first is fine; the second is burning
5× for every dollar of ARR — a serious problem.
Burn Multiple gives the context. Two companies with the same burn rate might
have very different capital efficiency depending on their growth velocity.
Burn Multiple and the Rule of 40
Both metrics assess SaaS efficiency, but from different angles:
- Rule of 40: Revenue growth + EBITDA margin ≥ 40 (operating efficiency of the P&L)
- Burn Multiple: Cash burn / net new ARR (capital efficiency of growth spending)
A company can pass Rule of 40 but have a poor burn multiple if it's growing
with unsustainable cash spending relative to ARR additions.
How to improve burn multiple
Reduce CAC — more ARR from the same S&M spend
Reduce churn — net new ARR improves when churned ARR falls
Increase ACV — same headcount, higher ARR per deal
Burn Rate vs Burn Multiple: What's the Difference?
Burn rate measures how fast you spend cash. Burn Multiple measures how efficiently that spending generates ARR. Both matter — here's when to use each.
Founders often confuse burn rate with burn multiple. They're related but measure
fundamentally different things.
Burn rate
Burn rate is a cash flow metric: how many dollars per month are you spending?
Gross burn: total monthly cash out (payroll + rent + software + everything else)
Net burn: gross burn minus revenue received (cash-in basis, not ARR bookings)
A company spending $500k/month with $200k in cash received has a $300k net burn.
Burn rate tells you how long your runway lasts:
Runway = cash balance / net monthly burn
Burn Multiple
Burn Multiple relates spending to output: net burn / net new ARR.
It doesn't care about the absolute dollar amount — it asks whether your spending is
generating proportional growth. A $5M/month burn is fine if you're adding $10M+ in
net new ARR each month.
Which to optimize
Near-term (fundraise planning): focus on burn rate — determines when you run out of cash
Medium-term (investor narrative): focus on Burn Multiple — determines whether your
spending is efficient enough to justify the next round
Long-term (unit economics): focus on Burn Multiple converging toward 0 as ARR
compounds and burn stays flat
Use the Burn Multiple Calculator to track both
your runway and your efficiency multiple in one place.
SaaS Efficiency Metrics: Burn Multiple, Magic Number, and Rule of 40
Compare the three key SaaS efficiency metrics — Burn Multiple, Magic Number, and Rule of 40 — and learn when to use each to evaluate your business.
SaaS has three widely-used efficiency metrics, each measuring a slightly different
aspect of how well you convert inputs to outputs.
The three metrics
Burn Multiple = net burn / net new ARR
Measures total operational efficiency. Best for growth-stage companies where every
dollar of spending should be traceable to ARR generation.
Magic Number = net new ARR (this quarter) / S&M spend (last quarter)
Measures go-to-market efficiency specifically. Useful for diagnosing whether your
sales and marketing motion is working before scaling spend.
Rule of 40 = ARR growth rate % + EBITDA margin %
Measures the growth-profitability tradeoff. Used more by late-stage / pre-IPO
companies evaluating their sustainable growth trajectory.
When to use each
Stage
Primary metric
Why
Seed / pre-PMF
Magic Number
Is the GTM hypothesis working?
Series A
Burn Multiple
Is growth efficient enough to scale?
Series B+
Burn Multiple + Rule of 40
Demonstrate efficiency and durability
Pre-IPO / public
Rule of 40
Compare against public comps
Combining the metrics
A healthy Series A company might show: Magic Number > 0.75, Burn Multiple < 1.5x,
with a clear path to Rule of 40 above 40% as it scales.
What Is Burn Multiple? The Capital Efficiency Metric VCs Use
Burn multiple (net burn / net new ARR) is the capital efficiency metric investors use at Series A and B. This guide explains what it is, how to calculate it, and what benchmarks to target.
Burn multiple is the SaaS capital efficiency metric popularized by David Sacks
(Craft Ventures) and widely adopted by Series A/B investors after 2021.
Burn Multiple = Net Cash Burn ÷ Net New ARR
It answers: for every dollar of ARR you add, how much cash do you consume?
Why it matters more than burn rate alone
Burn rate tells you nothing without growth context. $500k/month burn at a
company adding $1M/month in ARR is world-class efficiency. The same burn
adding $100k/month in ARR is burning through capital dangerously.
Burn multiple combines burn and growth into a single efficiency ratio.
The rise of burn multiple post-2021
During the 2021 bull market, investors tolerated high burn for growth. Post-2022
correction, capital efficiency became a primary investment criterion.
Companies with burn multiples > 3× struggled to raise Series B in 2022–2023
even with good ARR growth. Investors repriced for efficiency.
How burn multiple complements other metrics
Metric
What it tells you
ARR growth %
Are you growing fast?
Burn multiple
Are you growing efficiently?
NRR
Is growth sustainable?
Gross margin
Is the business scalable?
Together, these four metrics paint a complete picture of SaaS health.
Practical tactics to reduce your burn multiple from 3x+ to under 2x — through CAC optimization, churn reduction, expansion revenue, and operational efficiency.
Improving burn multiple means either generating more ARR per dollar of spend,
or spending less to generate the same ARR.
Why burn multiple deteriorates
The most common causes of burn multiple creeping up:
1. Expansion ARR isn't scaling: New ARR relies entirely on expensive acquisition.
If NRR is below 100%, net new ARR is capped by acquisition, and every new customer
costs full CAC.
2. CAC is rising: Paid channels saturate. Cost per lead increases. Conversion
rates drop. Same spend, less ARR.
3. Churn is absorbing expansion: High churned ARR offsets new ARR. The
denominator (net new ARR) shrinks even if gross new ARR grows.
4. Fixed costs grew ahead of revenue: Hiring in anticipation of growth that
didn't materialize. Burn grows; ARR growth doesn't.
Lever 1: Drive expansion ARR
Expansion ARR requires near-zero additional burn. If a customer expands from
$1k to $2k MRR, you generate $12k additional ARR without additional S&M spend.
At 30% expansion ARR as a share of net new ARR, burn multiple improves by
roughly 30% with no other changes.
Lever 2: Reduce CAC through channel optimization
Stop spending on channels with burn multiple > 3× at the channel level.
Identify which channels (paid search, outbound, content, referral) have
the best ARR-per-dollar and reallocate.
Lever 3: Improve churn to lift net new ARR denominator
Every churned dollar reduces net new ARR directly. A company adding $500k gross
new ARR but churning $200k has $300k net new ARR. Fix the $200k churn and
burn multiple improves by 67% without touching acquisition spend.
Lever 4: Cut inefficient non-S&M spend
Burn multiple suffers when operational overhead grows disproportionately.
Audit non-growth spending: infrastructure, G&A, tools, underperforming hires.
Even $50k/month in reduced operational burn improves net burn by $600k/year.
Burn Multiple vs Rule of 40: Which SaaS Efficiency Metric to Use?
Burn multiple and Rule of 40 both measure SaaS efficiency, but they tell different stories. This guide explains when to use each and how they complement each other.
Both burn multiple and Rule of 40 measure SaaS capital efficiency — but from
different angles, for different audiences, and at different stages.
Rule of 40
Score = ARR Growth Rate % + EBITDA Margin %
A 60% ARR growth with -20% EBITDA margin scores 40. A 20% growth with 25%
EBITDA margin also scores 45.
Rule of 40 uses EBITDA — which is an accounting metric that includes depreciation
and doesn't account for cash timing. It's used in investor reporting, public
company comparisons, and valuation discussions.
Burn Multiple
Score = Net Cash Burn ÷ Net New ARR
A company at 1.5× is spending $1.50 for every $1 of new ARR.
Burn multiple uses cash, not EBITDA. It's more relevant for private companies
where cash is finite and runway is a real constraint. It's more actionable
operationally.
When each applies
Context
Use this
VC fundraising deck (Series A/B)
Both — Rule of 40 for scale, burn multiple for efficiency
Internal operational tracking
Burn multiple — cash is real
Public company comparables
Rule of 40 — standard analyst metric
Early stage (< $1M ARR)
Burn multiple — EBITDA is meaningless early
Growth stage ($10M+ ARR)
Both
The key difference
A company can score well on Rule of 40 but poorly on burn multiple if:
- It has non-cash expenses distorting EBITDA
- It uses aggressive revenue recognition that inflates EBITDA
- It has high working capital consumption not reflected in EBITDA
Conversely, a company can have a good burn multiple (efficient cash use)
but score below 40 if growth is decelerating faster than margins improve.
Track both. Burn multiple tells you how efficiently you're scaling.
Rule of 40 tells you if the business is balanced.