Your Real Runway: How Long Does Your Business Have?

As a founder, you're constantly looking ahead: new customers, new features, new markets. That forward momentum is essential. But sometimes, looking forward means looking squarely at your bank balance and asking a tough question: how much time do I really have?

This isn't about fear. It's about control. Your "runway" is the number of months your business can keep operating before it runs out of cash, assuming your current spending and no new income. It's the most fundamental number in your business because it dictates every strategic decision you make.

Miscalculating your runway, or ignoring it, is a common trap. It can force you into desperate decisions, make fundraising impossible, or worse, lead to a sudden, painful shutdown. But when you know your runway, you can act early, decisively, and with confidence.

What Your Runway Really Means

At its simplest, your runway tells you how many months you can survive. It comes down to two key figures: how much cash you have right now, and how quickly you're spending it.

The amount you're spending more than you're making each month is called your net burn rate. It’s not just your expenses; it’s your expenses minus any actual cash income you receive. If your business is profitable, you have a negative burn rate (or positive cash flow), which means your runway is theoretically infinite – you're adding to your cash balance each month. But for most early-stage businesses, especially those growing fast, there's a positive net burn rate.

Your runway is calculated with a straightforward formula:

Cash in Bank / Monthly Net Burn Rate = Runway in Months

This number is your operating horizon. It tells you how long you have to hit a major milestone, become profitable, or raise more capital. The longer your runway, the more time you have to experiment, learn, and adapt without panic.

How to Calculate Your True Runway

Let’s break down how to get this number right, step by step. This isn't about guesswork or optimistic projections; it's about being brutally honest with yourself and your numbers.

Step 1: Get an Honest Cash Balance

Start by knowing exactly how much cash you truly have. This means looking at your bank accounts, not just your accounting software.

First, consolidate all your accounts. If you use multiple bank accounts (personal, business, different banks, mobile money wallets), add up the balances from all of them. Second, exclude unavailable funds. Don't count money that's locked up in fixed deposits, funds you've earmarked for specific liabilities (like customer refunds or VAT collected), or money that has been committed to a future expense you can't cancel. Only count cash that is immediately available for general operations. Finally, don't count receivables. Money owed to you by customers isn't cash until it hits your account. Ignore it for this calculation.

Write down this total. This is your starting point. For a hypothetical example, let's say you have ₦5,000,000 in available cash.

Step 2: Calculate Your True Monthly Net Burn Rate

This is where many founders trip up. You need to identify all the cash that leaves your business each month, and then subtract the cash that comes in.

1. List all cash outflows: Go through your bank statements for the past three to six months and list every single expense. Don't miss anything. Include fixed costs like salaries, rent, internet, software subscriptions, generator fuel, and security. Also account for variable costs such as cost of goods sold, delivery fees, marketing spend, and commissions. Crucially, don't forget irregular but predictable costs. Think about things that don't happen every month but are guaranteed: quarterly tax payments, annual software renewals (divide these by 12 to get a monthly average), equipment maintenance, and loan repayments. If you're paying yourself from the business, include this as a real cash outflow. For many early-stage founders, business and personal finances are intertwined; be honest about what business cash is covering for personal needs and add it to your burn.

   • Example: For instance, let's say over the last 3 months, your total outflows were ₦1,500,000. Your average monthly outflow is ₦500,000.

2. List all cash inflows: In the same period, list all the actual cash income received from sales, services, or other sources. Again, only count what has hit your bank account.

   • Example: Similarly, let's say over the last 3 months, your total inflows were ₦900,000. Your average monthly inflow is ₦300,000.

3. Calculate Net Burn: Subtract your average monthly cash inflow from your average monthly cash outflow.

   • Example: Subtracting your average monthly cash inflow from your average monthly cash outflow, we get ₦500,000 (outflows) - ₦300,000 (inflows) = ₦200,000 monthly net burn.

Step 3: Account for One-Off and Future Costs

Your average burn might not capture everything. Consider any significant, upcoming expenses that aren't part of your regular monthly operations. For example, are you planning to buy a new delivery bike next month (e.g., ₦300,000)? Do you have a large inventory purchase coming up for a peak season? Are you due for a major server upgrade or a new marketing campaign? Is a large loan repayment due in 2 months?

You can handle these in two ways:

• Deduct from cash: Reduce your current cash balance by the amount of these known future expenses.
• Adjust burn: If they're spread out, add a portion to your monthly burn.

For simplicity, let's say you have a known, unavoidable expense of ₦300,000 next month. You can either deduct this from your starting cash balance now, or factor it into a higher burn for that specific month.

Step 4: Project Income Realistically (or Not at All)

This is the most dangerous part of runway calculation if you're not disciplined. Be brutally conservative: for early-stage businesses with unpredictable revenue, the safest approach is to calculate your burn assuming zero new income. This gives you the absolute minimum runway you have. Only count guaranteed income. If you have recurring revenue from subscriptions, or signed contracts with clear payment schedules, you can include that. But don't count sales targets, leads, or hopeful deals. Perform a local reality check: payment reliability can be an issue. Even with signed contracts, actual cash hitting your account might be delayed. Factor this in by only counting cash received, not just invoiced.

For our example, let's stick with the ₦300,000 average monthly income, but be prepared to calculate a scenario with ₦0 income.

Step 5: Calculate Your Runway and Stress Test It

Now, put it all together.

Initial Calculation: For our hypothetical example: Available Cash: ₦5,000,000. Monthly Net Burn: ₦200,000. Runway: ₦5,000,000 / ₦200,000 = 25 months.

Adjust for One-Offs: If you deduct the ₦300,000 future expense from your cash now, your adjusted cash becomes ₦5,000,000 - ₦300,000 = ₦4,700,000. Your runway then becomes ₦4,700,000 / ₦200,000 = 23.5 months.

Stress Test 1 (Zero New Income): What if your income drops to zero next month? Your new monthly burn (assuming your ₦300k income disappears) would be ₦500,000 (outflows) - ₦0 (inflows) = ₦500,000. Your runway would then be ₦4,700,000 / ₦500,000 = 9.4 months. This is a critical number, showing your bare minimum survival time.

Stress Test 2 (Expenses Rise): What if fuel prices increase, or the exchange rate affects your software subscriptions, adding 10% to your outflows? Your new outflows would be ₦500,000 * 1.1 = ₦550,000. With ₦300k income, your new net burn would be ₦550,000 - ₦300,000 = ₦250,000. Your runway would then be ₦4,700,000 / ₦250,000 = 18.8 months.

You should now have a range of runway figures: your optimistic, realistic, and worst-case scenarios.

Step 6: Decide: Cut, Grow, or Raise

Once you have these numbers, you need to act. Your runway length dictates your strategy. If you have more than 12 months, you're in a relatively strong position. This gives you ample time to focus on growth, test new ideas, and build. However, don't get complacent; keep monitoring it. If you have 6-12 months, this is your alert zone. You need to start making serious plans. Can you reach profitability within this window? If not, you should begin the process of fundraising immediately. Raising capital takes time – often 3 to 6 months, and sometimes longer, especially in challenging economic conditions. You want to start when you're strong, not when you're desperate. If you have less than 6 months, this is a red alert. You need to make drastic decisions now. Review every single expense: can you pause non-essential software, renegotiate supplier terms, or reduce team size? Push for revenue: focus all efforts on closing sales, even if it means smaller deals. If your current path isn't working, consider a pivot to find a faster path to revenue. Prepare for difficult conversations: if things don't improve quickly, you may need to consider winding down gracefully, which protects your reputation and allows you to pay off debts responsibly.

The key is to make these decisions when you still have options, not when your back is against the wall.

Common Mistakes and How to Avoid Them

I've worked with many founders, building systems that track every aspect of their business, from inventory to payments. Over time, I've seen a few recurring errors in how they think about their money.

Mistake 1: Confusing Profit with Cash

Your profit and loss (P&L) statement tells you about your business's profitability over a period, but it doesn't tell you how much cash is in your bank. Profit includes things like credit sales (money you're owed but haven't received) and excludes loan repayments (which are cash outflows but not operating expenses).

• How to avoid: Always focus on your cash flow statement. Track actual cash in and actual cash out. When building back-office systems, like the one for NextGen Kiddies or the ERP for EMPI Costumes, a big part of the work is making sure every naira in and out is tracked clearly. These systems automate the categorisation of expenses and income, so founders can see their actual cash flow at a glance, not just an accounting profit.

Mistake 2: Ignoring Irregular Expenses

Many founders only account for monthly expenses. They forget about the annual software subscription, the quarterly tax payment, the generator service, or the once-a-year insurance premium. These hit hard when they come due and can drastically shorten your runway.

• How to avoid: Look at a full year of bank statements to identify all recurring expenses, no matter how infrequent. Budget for these by averaging them over 12 months and adding them to your monthly burn, or by setting aside dedicated cash reserves.

Mistake 3: Over-Optimistic Revenue Projections

It’s easy to believe your sales forecasts will always hit, or that every promising lead will convert into paying customers. This leads to inflated income projections and an artificially long runway.

• How to avoid: Be conservative. For runway calculations, it's safer to assume zero new income, or only count revenue that is absolutely guaranteed (e.g., from existing subscriptions or pre-paid services). Re-evaluate your projections frequently against actual performance.

Mistake 4: Not Factoring in Personal Expenses (for bootstrapped founders)

If your business is bootstrapped and you're drawing cash for personal living expenses without a formal salary, it's easy to overlook this as a business expense. But it's cash leaving the business.

• How to avoid: Be transparent with yourself. Treat your personal drawings or founder's salary as a fixed, non-negotiable expense in your burn rate calculation.

Mistake 5: Waiting Too Long to Act

The biggest mistake is hoping things will get better and delaying tough decisions. Panic sets in when you have one or two months of runway left, and at that point, your options are severely limited. Fundraising becomes nearly impossible, and cutting costs might just delay the inevitable.

• How to avoid: Calculate your runway monthly, without fail. Set clear trigger points for action (e.g., "If my runway drops below 6 months, I will immediately initiate fundraising discussions and cut non-essential marketing spend"). Proactive decisions are always better than reactive ones.

Your Runway Checklist

Before you move on, copy this checklist and use it to review your own business.

• Consolidated cash balance calculated from all accounts.
• All monthly cash outflows identified (including averaged irregular costs).
• All monthly cash inflows identified (actual cash received).
• Net monthly burn rate calculated (Outflows - Inflows).
• Upcoming one-off, large expenses accounted for (either deducted from cash or added to burn).
• Revenue projections reviewed for brutal realism (or set to zero for worst-case).
• Runway calculated (Current Cash / Net Monthly Burn).
• Stress test complete (what if revenue drops by X%, or expenses rise by Y%?).
• Clear decision made: cut costs, focus on growth for profitability, or start fundraising.

What I'd do this week

Knowing your runway is a continuous exercise, not a one-off task. Here are three concrete actions I'd take this week:

1. Pull all bank statements for the last 6 months (every account, every wallet). Categorise every single inflow and outflow into a simple spreadsheet. Calculate your average true monthly cash burn, making sure to include those irregular costs.
2. Create a simple spreadsheet or update your existing one with your current consolidated cash balance and this newly calculated average monthly burn. Immediately recalculate your runway assuming zero new revenue. This is your most conservative, and perhaps most honest, number.
3. Based on that conservative runway, set a clear, non-negotiable trigger point for action. For example: "If my runway drops below 6 months, I will immediately initiate discussions with my team and advisors about a 25% across-the-board cut to non-essential expenses, and dedicate 50% of my time to fundraising."

Your runway isn't just a number; it's a measure of your business's resilience and a guide for your decisions. By understanding it honestly and acting on it proactively, you give your business the best chance not just to survive, but to thrive.

— Samuel