Startup Runway
Startup runway is the number of months a startup can continue operating before running out of cash, given its current burn rate and cash balance.
Formula
In depth
Runway is the single most important operational metric for pre-profitable startups. It determines how long you have to reach the next milestone before needing to raise again.
Key rules of thumb: - Raise when you have 6+ months of runway left (not 2 — fundraising takes longer than founders think) - Keep minimum 12 months of runway at all times post-raise - Default assumption: fundraising takes 3–6 months - Series A fundraising can take 6–9 months
Ways to extend runway without cutting team: - Reduce CAC by shifting to organic channels - Raise prices — a 20% price increase on existing customers adds revenue immediately - Cut software subscriptions — most startups spend 20–30% too much on SaaS tools - Annual prepay offers: give customers 2 months free for annual payment - Delay non-critical hiring
Fixed-price development vs hourly: hourly development is one of the biggest runway drains for technical startups. A fixed-price agency protects runway by eliminating open-ended dev spend.
Real example
$200,000 in the bank. Monthly expenses: $30,000. Monthly revenue: $8,000. Net burn = $22,000/month. Runway = $200,000 ÷ $22,000 = 9.1 months.
Tools & calculators
Related terms
MVP (Minimum Viable Product)
A Minimum Viable Product (MVP) is the simplest version of a product that can be released to early users to validate core assumptions, gather feedback, and begin learning — with the minimum amount of effort and cost.
MRR (Monthly Recurring Revenue)
Monthly Recurring Revenue (MRR) is the predictable, normalized monthly revenue generated from all active subscriptions. It's the north star metric for SaaS companies.
CAC (Customer Acquisition Cost)
Customer Acquisition Cost (CAC) is the total cost of acquiring one new paying customer, including all marketing and sales spend.
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