Startup Runway Planning Guide

You closed a $500,000 seed round in January. Monthly burn is $45,000 — two engineers, a designer, and your own salary. The math is straightforward: $500,000 / $45,000 = 11.1 months of runway.

That sounds like nearly a year. It isn't, practically speaking. You need to start your next raise at month 7 or 8 to close before you run out of cash (fundraising typically takes 3-6 months). That means you have 5-6 months of actual operating time before you need to be deep in conversations with investors.

Understanding runway isn't just division. It's about what that number means for your decisions right now.

The Default Alive / Default Dead Framework

Paul Graham introduced this framework because it reframes how founders think about their financial position. The question isn't "how many months do we have?" It's:

If we keep doing what we're doing with current revenue growth, do we reach profitability before running out of cash?

• Default alive: Current growth rate × current burn → profitable before cash runs out
• Default dead: Current trajectory → out of cash before break-even

At $500K with $45K/month burn and no revenue: clearly default dead. The clock is running.

But add $15K/month in revenue growing at 15% month-over-month:

• Month 1: $15K revenue, $45K burn → net burn $30K
• Month 4: ~$23K revenue, $45K burn → net burn $22K
• Month 7: ~$35K revenue, $45K burn → net burn $10K
• Month 9: ~$45K revenue — break-even

In this scenario, you'd use roughly $180,000 of your $500K before reaching break-even. You'd be default alive by month 9, with $320K in the bank as cushion. That's a fundamentally different company than one with flat revenue.

What Moves the Runway Number

Every dollar reduction in monthly burn adds $1 / remaining_burn months to your runway. At $45K burn, cutting $5,000/month adds just 11% more time immediately, but the compounding effect matters more:

Scenario: Cut burn from $45K to $35K

• Original runway: $500K / $45K = 11.1 months
• New runway: $500K / $35K = 14.3 months (+3.2 months)
• More importantly: you now need to raise 3.2 months later, which means product can be 3.2 months further along when you start conversations

Where founders typically find $5,000-$10,000/month in cuts:

• Delay a hire by 60 days: ~$10,000-$20,000 savings depending on salary
• Cut unused SaaS subscriptions: $500-$2,000/month (use the Subscription Audit Calculator to find these)
• Move from office space to co-working: $1,500-$4,000/month in many cities
• Reduce AWS/infrastructure costs via right-sizing: $500-$3,000/month for early-stage companies

None of these cuts are catastrophic. Together they can add 2-4 months of runway, which may be the difference between closing a Series A with strong metrics vs. closing it under duress.

Calculating Your True Burn Rate

Net burn vs. gross burn matters more than most founders track:

• Gross burn: total cash out per month ($45K in our example)
• Net burn: cash out minus cash in ($45K - $15K revenue = $30K net burn)

Investors ask about both. When they say "what's your burn?" they usually mean net burn. But gross burn tells you the fixed cost structure — what you'd burn with zero revenue.

Track both monthly. When investors ask about burn rate, lead with net and clarify: "Net burn is $30K/month; gross burn is $45K."

The Fundraising Timeline Math

The standard rule: start your next raise 18 months before your expected close date — but that assumes you want 18 months of post-raise runway. In practice:

For seed to Series A:

• Typical raise timeline: 3-6 months from first meetings to close
• Ideal time to start: when you have 6-8 months of runway left
• That means: with 11 months of runway, you should be active in conversations at month 3-5

What "starting a raise" means:

• Month 1-2: update deck, refresh model, get intros from seed investors
• Month 3-4: first meetings with target leads
• Month 5-6: term sheet negotiations
• Month 7-8: diligence, legal, close

If you wait until month 8 to start because you feel comfortable, you'll close at month 14 (if you're lucky) — 3 months past when you should have started.

Milestone-Based Runway Thinking

The best founders don't just track runway in months — they track it in milestones. The question isn't "do we have 11 months?" but "can we hit the metric we need to raise a Series A in 11 months?"

Typical Series A thresholds in 2026 (vary by sector):

• SaaS: $1-2M ARR with <5% monthly churn and 3x+ YoY growth
• Marketplace: $1-3M GMV/month with positive unit economics
• Consumer: 100K+ MAU with demonstrated retention (D30 > 25%)

Map your current metrics to the threshold. If you're at $200K ARR and need $1.5M ARR in 11 months, that's 7.5x growth — roughly 20% month-over-month, every month, for 11 months. Is that achievable? If yes, proceed. If not, either adjust the milestone target (Series A at $800K ARR in some markets) or extend runway now by cutting burn.

When to Cut vs. When to Invest

Cutting burn extends runway but can slow growth. The framework:

Cut without hesitation when:

• The expense doesn't directly drive revenue or product (office snacks, excess tooling, redundant subscriptions)
• The hire is a "nice to have" delayed less than 90 days

Don't cut when:

• Cutting removes a revenue-generating team member (sales, growth)
• Cutting reduces product velocity below what's needed to hit fundraising milestones

One founder cutting one engineer to extend runway by 3 months may miss their product milestone. The 3-month extension becomes irrelevant if the milestone slip causes the raise to fail.

This article provides general business guidance. Consult appropriate professionals for decisions involving significant financial commitments.