Runway calculator — when to fundraise in 2026
Runway calculator — when to fundraise in 2026
Runway is how many months your company survives without new money. It's the most basic finance metric, but the most important one for fundraise timing.
> Runway = Cash on hand / Net Burn per month
Net Burn = expenses − revenue (per month).
If you're cash-positive (Net Burn ≤ 0) — your runway is infinite, and you don't need to fundraise (unless you want to accelerate).
2026 benchmarks (post-ZIRP reality)
| Runway | Status | ||
|---|---|---|---|
| <3 months | Catastrophe — emergency cost cuts, any term sheet is acceptable | ||
| 3-6 months | Critical — raise on non-negotiable terms | ||
| 6-9 months | High pressure — weak negotiating position | ||
| 9-12 months | The right time to start fundraising | ||
| 12-18 months | Healthy norm for seed / Series A | ||
| 18-24 months | Strong position — fundraise from strength | ||
| >24 months | The round was "extra", but not critical |
Worked example
A startup:
- Cash: $2,500,000
- Monthly expenses: $250,000
- Monthly revenue: $50,000
- Net Burn = 250 − 50 = $200,000/mo
- Runway = 2,500,000 / 200,000 = 12.5 months
The catch: which burn to use?
3 types:
| Type | Formula | When to use | ||
|---|---|---|---|---|
| Gross Burn | Total expenses | If revenue is unstable (early stage) — conservative | ||
| Net Burn | Expenses − revenue | Standard, balanced | ||
| Adjusted Net Burn | Net Burn − one-time expenses | If there was a large capex event — normalize |
When to start fundraising — in detail
| Runway when you start | Outcome | ||
|---|---|---|---|
| 12+ months | Best position. Multiple term sheets. Can negotiate. | ||
| 9-12 months | Good. 1-2 term sheets likely. | ||
| 6-9 months | Tense. Investors see weakness, lowball offers. | ||
| <6 months | "Bridge financing" trap. Existing investors at unfair terms. |
- Preliminary outreach + decks: 3-4 weeks
- Partner meetings: 4-6 weeks
- Due diligence: 2-4 weeks
- Term sheet → close: 4-6 weeks
- Total: 13-20 weeks = 3-5 months minimum
If you have 6 months of runway, you'll have 1 month left by close. That's a very thin position.
5 levers to extend runway without external capital
1. Hire freeze + selective layoffs (-30% burn realistic)
70% of a SaaS budget = payroll. Each person let go = $5-15k/mo of runway extension. Hard, but the most effective lever.2. Annual prepay (+20-30% to immediate cash)
A −15-20% discount for annual prepay. The customer is happy (saves money). You get 12 months of cash upfront → runway extends mathematically.3. Price increase (+10-15% revenue without new customers)
Boring but it works. An annual price review should be automatic. If you haven't raised prices in 12+ months — raise +15% tomorrow. You'll lean on existing customers and acquire new ones a touch slower — net positive for runway.4. Venture debt (+6-12 months runway, non-dilutive)
- Brex Credit, SVB Credit Line, Silicon Valley Bridge
- Cost: ~10-15% APR
- Condition: an existing equity raise <12 months ago
- Doesn't fix the underlying problem, but buys time
5. Bridge from existing investors
If existing investors don't want to bridge → a bad market signal. If they do — fine, but new investors will price-shop after a bridge. A bridge says "we won't reach the next round in our current shape".What to do when runway is <6 months
Day 1:
1. Stop all non-essential spend (tools, contractors, events, marketing experiments)
2. Layoff conversation with CFO/board
Week 1:
3. Annual prepay campaign — 20% discount for upfront annual
4. Reach out to existing investors about a bridge
5. Reach out to venture debt providers
Week 2-3:
6. Execute layoffs (if needed)
7. Reduced burn rate fixed → recalculate runway
8. Re-prioritize roadmap to revenue-impact features only
Week 4+:
9. Fundraise process kicks off with the new lower burn rate in the pitch (it shows discipline)
When runway >24 months is also bad
Paradoxically:
- Lots of cash → you relax psychologically
- You spend on "nice-to-haves" instead of essentials
- You don't learn a scrappy mindset
- When the round runs out — shock
Top-tier SaaS startups deliberately size rounds to 18-24 months, not 36+, to keep urgency.
Relationship to other metrics
| Metric | Relationship | ||
|---|---|---|---|
| Burn Multiple | Capital efficiency drives sustainable burn → affects runway | ||
| MRR Growth Rate | If revenue grows fast → Net Burn falls → runway extends | ||
| Gross Margin | Higher margin → less cash burned per $ of revenue → runway extends |
Bottom line
Runway is the single most important number for founders. Know it every Monday morning. If it's <12 months — you have 1-3 months to either resolve it via cost cuts / revenue growth, or start a serious fundraise.
Calculate your Runway below + Goal mode to find the target burn for a given runway.
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Further resources
- /en/burnRate — Burn Rate on its own
- /en/burnMultiple — Burn Multiple for efficiency
- /en/grossMargin — Gross Margin affects burn
- /en/blog/burn-multiple-saas-2026 — Burn Multiple deep dive