Series A Runway Extension Calculator

The 18/24 Month Question

Standard Series A runway target is 18-24 months to the next milestone (usually Series B or profitability). With more uncertain markets, founders increasingly target 24-36 months. Less than 12 months runway is yellow zone; less than 6 months is red zone (urgent action required).

Calculate runway = cash / (monthly burn − monthly revenue). If revenue is growing, the math gets more complex — your effective burn declines each month as revenue grows. Use a spreadsheet model that simulates monthly cash flow with revenue compounding.

Cost Cut Hierarchy

Tier 1 (lowest pain): pause discretionary spend, vendor renegotiation, freeze hiring. Saves 10-20% of burn typically. No team impact.

Tier 2 (moderate pain): cut marketing programs not driving SQLs, reduce contractor spend, pause low-ROI experiments. Saves another 10-20%. Slows growth but preserves team.

Tier 3 — The Hard Cut

Layoffs. Cutting 15-25% of headcount typically saves 10-20% of burn (depending on team composition). High emotional cost, signals weakness to remaining team and investors. Only do once — repeated layoffs destroy team trust.

When you do, cut deeper than you think you need to. The biggest mistake is too-small a cut that requires a second round in 3 months. Better to cut once cleanly. Communicate clearly, treat exiting employees with dignity, and document the strategy shift this enables.

Bridge Round Strategy

Bridge rounds (typically convertible notes or SAFEs from existing investors) extend runway 6-18 months. Investors usually price at the previous round's valuation (or with a discount). Avoid taking from new investors at a punitive valuation cut — better to do an inside round.

Best path: combine modest cuts + bridge round + revenue acceleration. The bridge gets you 6-12 months; the cuts extend that by 4-6 more; revenue growth compounds. Total: 24+ months from a 9-month start.

WARN-Act and Layoff Compliance (US Startups)

Before any layoff cut at a US startup with 100+ employees, you must comply with the federal WARN Act (U.S. Department of Labor): 60 days written notice to employees, the state, and the local government for any "mass layoff" (50+ workers OR 33%+ of workforce at a single site). Several states (California, New York, New Jersey, Illinois) have stricter "mini-WARN" laws that trigger at lower headcounts. Severance is not federally required, but startup convention is 2-4 weeks base + 1 week per year of service + healthcare continuation (COBRA) — budget this into the layoff savings calculation, not just monthly burn reduction. Skipping WARN exposes the company to back-pay plus penalties up to $500/day, which can exceed the savings. Always have employment counsel review the cut plan before announcement day.

Path to Default-Alive: Profitability Without a Bridge

"Default-alive" — coined by Paul Graham — means your trajectory reaches profitability before cash runs out. Calculate by projecting monthly revenue growth, monthly burn, and cash on hand. If revenue × growth rate × gross margin exceeds burn within your runway, you are default-alive; otherwise default-dead. The path: combine 30% burn cut + 5% monthly revenue growth + a one-time pricing increase on existing customers. Many post-pandemic SaaS companies took this route over raising at down-round valuations — by month 18, they were profitable and never needed a Series B. The Series B is no longer the only credible exit; default-alive plus eventual M&A or PE rollup is increasingly the playbook for capital-efficient SaaS. Updated 2026-06-25.