🔥 Burn Rate & Runway Calculator

The Burn Rate & Runway Calculator tells you two things every founder needs to track constantly: how fast you're spending cash, and how many months you have left before the balance hits zero. It goes beyond a single static snapshot by projecting your cash balance forward up to 24 months, compounding your revenue and expense growth rates each month, so you can see whether growth will outrun spending before cash runs out.

How It Works

Net Burn is your Monthly Expenses minus your Monthly Revenue — the actual cash leaving your account each month. Gross Burn is simply your total monthly expenses regardless of revenue. The simple Runway figure divides your Current Cash Balance by Net Burn for an instant estimate. The calculator then runs a month-by-month projection: each month's revenue and expenses compound by your entered growth rates, the resulting net burn is subtracted from the prior month's balance, and the first month the balance drops to zero or below is flagged as your Projected Zero-Cash Month.

Why It Matters

A single "cash ÷ burn" number can be misleading if your revenue is growing quickly — you might have far more real runway than the simple math suggests, or far less if expenses are growing faster than revenue. Projecting month by month gives you an early warning of exactly when to start fundraising, cut costs, or push harder on revenue, instead of finding out when the bank balance is already critical.

Tips for Accurate Results

• Use your most recent 1-3 months of actuals for revenue and expenses rather than a budget or plan — burn rate should reflect reality.
• Keep growth rate assumptions conservative; overestimating revenue growth is the most common way founders overstate their runway.
• Re-run this calculation monthly — burn rate and runway change constantly as spending and revenue shift.
• Start fundraising or cutting costs well before the projected zero-cash month, since raising capital typically takes 3-6 months.