How to Calculate Runway: Formula & Examples

Master Your Cash: The Ultimate Guide to Calculating Startup Runway

Whether you are launching a high-growth tech startup, running a school club business, or managing a side hustle, understanding your financial lifeline is critical. In the business world, this lifeline is known as runway.

Simply put, runway is the amount of time—usually measured in months—that your business can continue operating before it runs completely out of cash. Knowing your runway helps you make smart decisions, avoid sudden financial crunches, and plan when you might need to raise more money or boost sales.

1. The Core Formula

Calculating your runway is surprisingly straightforward. At its heart, it relies on two main numbers: how much money you currently have, and how fast you are losing it.

$$ text{Runway (Months)} = frac{text{Total Cash Balance}}{text{Net Burn Rate (Monthly)}} $$

Let’s break down what these terms mean:

• Total Cash Balance: All the liquid money your business currently has in the bank, including savings, checking accounts, and easily accessible funds.
• Net Burn Rate: How much more money you spend than you make each month. If your expenses are higher than your revenue, you have a positive “burn.”

To find your Monthly Net Burn Rate, use this simple equation:
$$text{Net Burn} = text{Total Monthly Expenses} – text{Total Monthly Revenue}$$

2. A Step-by-Step Example

Let’s look at a quick, real-world scenario to see how this works in practice.

Imagine you run an online custom sticker business:

1. Total Cash Balance: You have $12,000 sitting in your business bank account.
2. Monthly Revenue: You make $2,000 a month selling stickers.
3. Monthly Expenses: You spend $5,000 a month on materials, shipping, marketing, and software subscriptions.

First, calculate your net burn rate:
$$$5,000 text{ (Expenses)} – $2,000 text{ (Revenue)} = $3,000 text{ per month}$$

Next, calculate your runway:
$$frac{$12,000 text{ (Cash)}}{$3,000 text{ (Burn Rate)}} = 4 text{ months}$$