SaaS Burn Rate & Cash Runway: The Complete Guide (2026)

What’s Included in Cash Runway? 💼

Cash Components:

• Current cash balance
• Cash equivalents
• Short-term investments
• Available credit lines
• Committed funding

Burn Rate Components:

Operating Activities:

• Employee costs
• Rent and utilities
• Marketing expenses
• Other operating costs

Investing Activities:

• Planned capital expenditures
• Expected investment needs

Financing Activities:

• Debt payments
• Interest obligations

How to Calculate Cash Runway

The basic formula for Cash Runway is:

Cash Runway = (Cash + Cash Equivalents) ÷ Monthly Net BurnNet burn = costs − revenue

Example:

• Current Cash and Cash Equivalents: $1,000,000
• Monthly Net Burn: $100,000

Cash Runway = $1,000,000 ÷ $100,000 = 10 months

You can also cross-check your own numbers with our free cash runway calculator.

Gross Burn vs. Net Burn

Which burn figure you divide by changes the answer, so it pays to know the difference:

Worked contrast: a startup with $750,000 in the bank spends $80,000/month and earns $50,000/month.

Net runway = $750,000 ÷ ($80,000 − $50,000) = 25 monthsNet burn $30,000/mo

Gross runway = $750,000 ÷ $80,000 = 9.4 monthsIf revenue dropped to zero

Net burn shows the likely path; gross burn shows how quickly things unravel if revenue disappears. Investors usually look at both.

Runway Benchmarks by Stage (2026)

How much runway you should hold rises with stage, and the old "12-month rule" has stretched. Rough 2026 targets:

These are targets to raise to, not floors to run down to. Hold more in a slow funding market, and remember the number that matters is runway to your next fundable milestone, not just to zero.

The Burn Multiple: Is Your Burn Efficient?

Runway tells you how long you last; the burn multiple tells you whether the burn is buying growth. Popularized by David Sacks of Craft Ventures, it divides net burn by the new recurring revenue it produced:

Net Burn ÷ Net New ARR = Burn MultipleLower is better — how many dollars burned per $1 of new ARR

Sacks' rough scale: under 1.0× is amazing, 1–1.5× great, 1.5–2× ok for early high-growth, and over 2× draws scrutiny. Early-stage reality runs higher — seed companies often sit around 2.5–3.4×, and above ~3× at seed is a risk flag. It's the cleanest one-number read on capital efficiency, which is exactly what investors reward in the current market.

Default Alive vs Default Dead

Paul Graham's framing (in his essay "Default Alive or Default Dead?") is the question every founder should be able to answer: at your current growth rate and spending, will you reach profitability before the money runs out? If yes, you're default alive; if no, default dead. The point isn't that default-dead is fatal — it's that founders often don't know which they are until it's late. In 2026, investors increasingly fund default-alive companies to accelerate, not default-dead ones to survive. Run the number early and honestly, and if you're default dead, know exactly which lever (growth or burn) closes the gap.

Why It Matters

Running out of cash is one of the most common reasons startups fail — in CB Insights' analysis of startup post-mortems, running out of cash was cited in about 29% of failures, second only to "no market need." It's usually the final cause rather than the root one, which is exactly why watching runway buys you time to fix the deeper problem. Runway is the single number that tells you how much time you have to fix that. Understanding it is crucial for:

• Planning fundraising timing
• Making hiring decisions
• Managing growth rate
• Setting spending priorities
• Strategic planning
• Survival planning

Types of Runway Analysis

Conservative Runway:

• Uses gross burn rate
• Ignores potential revenue
• Most conservative estimate

Realistic Runway:

• Uses net burn rate
• Includes predictable revenue
• Most commonly used

Optimistic Runway:

• Includes potential revenue increases
• Considers cost optimizations
• Used for best-case scenarios

Managing Cash Runway

To extend your runway:

Reduce Burn Rate:

• Optimize operations
• Cut non-essential costs
• Delay expansion plans
• Negotiate better terms

Increase Cash:

• Accelerate revenue
• Collect receivables faster
• Seek additional funding
• Sell non-core assets

Pro Tip: A long-standing rule of thumb from investors like Fred Wilson and Sequoia is to keep roughly 18–24 months of runway — enough to hit your next milestone and still have time to raise, since a round itself can take six months to close. In slower funding markets, founders often target the higher end.

Runway is an output of your whole financial model — the fastest way to extend it sustainably is to improve the drivers underneath, especially your unit economics. Adlega projects your runway, gross burn, and net burn from your assumptions and shows a cash-out chart, so you can see the raise-or-cut decision months ahead. Model a slice first with the free runway calculator or the P&L money-map.