The Formula Everyone Gets Wrong
Runway (months) = Cash Balance / Monthly Burn Rate
If you have ₹1 Cr cash and burn ₹20L/month, you have 5 months runway. But this is a lie if:
- Your burn is accelerating (hiring) — it's actually 4 months
- You're growing revenue — it's actually 6 months
- You have a major expense coming (server migration, office renewal) — it's actually 3 months
Rule of thumb: Your stated runway is your best-case number. Subtract 1 month and that's your real comfort zone for making fundraising decisions.
The Three Budget Categories
- Fixed Costs (60%): Salaries, office rent, insurance — hard to cut without damaging the company
- Variable Costs (30%): Infrastructure, cloud services, tools — can scale up/down based on growth
- Strategic Spend (10%): Marketing, R&D, hiring for future — first to cut in downturns, last to add in upturns
When fundraising is delayed, you cut strategic spend first (pause hiring, kill marketing). Fixed costs are the trap — they grow without you noticing.