Cash runway calculator: 5 proven ways to extend your cash runway

What does cash runway mean in business?

Cash runway is the number of months a company can keep operating before it runs out of cash, assuming its current spending and revenue stay the same.

It's based on two key factors:

💵 Cash reserves: The total amount of liquid cash the company has on hand. 

🔥 Burn Rate: The rate at which the company spends its cash. This is usually calculated as the monthly difference between cash expenses and cash revenues.

A longer cash runway gives you more options and better financial choices. So, how can you make your company's cash last longer?

Below, you'll learn how to calculate cash runway (including the difference between gross and net burn), how much runway you actually need, and five strategies to extend your cash runway and ensure business continuity.

Plus, we’ve included a free cash runway calculator to quickly determine your company’s cash runway.👇

Why cash runway matters

Running out of cash is how most failed startups end. When CB Insights reviewed 431 venture-backed companies that shut down since 2023, running out of capital was the leading factor at 70%, but it's usually the final blow rather than the root cause.

Poor product-market fit (43%), bad timing (29%), and weak unit economics (19%) explain why the money dried up.

Tracking your runway gives you early warning, so you can fix those underlying problems while you still have time and options.

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How to calculate your cash runway

To calculate your company's cash runway, you need to know what your current cash balance is. You'll find this in your company’s balance sheet.

For a more accurate figure, use net cash: subtract drawn credit lines, credit card balances, and other near-term obligations from your cash on hand, because a raw bank balance overstates your position by whatever you already owe.

Next, calculate your monthly net burn rate, which is the difference between your total cash outflows (operating expenses like salaries, rent, and utilities) and your cash inflows (typically revenue from operations).

Cash runway formula

Cash Runway (in months) = Current Cash Balance / Monthly Net Burn Rate

Enter your cash balance and average monthly net burn to see how many months of runway you have and the approximate month your cash would run out.

Gross burn vs. net burn

There are two ways to measure burn, and each tells you something different:

Gross burn rate is your total monthly operating expenses before revenue is counted, while net burn rate is the cash you actually lose each month after revenue is subtracted.

Gross burn shows whether your cost base is sustainable; net burn shows how much time you have left.

Net burn is the standard input for runway, but gross burn is a useful stress test.

If your revenue is concentrated in a few customers, one lost account could push net burn close to gross burn, so it's worth planning against gross burn and treating net burn as the optimistic scenario.

If you're pre-revenue, the two numbers are the same.

Cash runway example

Say your company has $600,000 in net cash, spends $90,000 a month, and collects $40,000 a month in revenue:

Gross burn = $90,000/month → runway if revenue stopped = $600,000 ÷ $90,000 ≈ 6.7 months
Net burn = $90,000 − $40,000 = $50,000/month → runway = $600,000 ÷ $50,000 = 12 months

The gap between those two figures shows how much your survival depends on revenue continuing to come in.

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How much cash runway do you need?

It depends on your stage and whether you plan to raise money.

For venture-backed startups, pre-seed and seed companies usually aim for 18 to 24 months of runway per round, and the common advice is to start fundraising when about 9 to 12 months remain.

The reason for the buffer is time. NYU's Entrepreneurial Institute notes that raising a round takes roughly six months, so a company that raises only 12 months of cash has to start fundraising again almost immediately.

Below about six months of runway, you're in a weak negotiating position. Investors can tell when a company is short on cash, which tends to mean worse terms.

5 tips to extend your cash runway

1. Cut non-essential costs

One of the easiest ways to free up cash fast is by eliminating unnecessary expenses.

So, start looking for areas to cut back like canceling subscriptions to under-used tools, and reducing budgets for team outings, and non-critical office supplies (does your company really need all that branded stationery?). 

If you're stuck on what to cut, do a cost audit. It'll show exactly where your money goes so you can separate the must-haves from the extras.

Your gross burn figure is a good starting point, since it shows total spending before revenue. Prioritize spending that drives revenue or helps your business expand. 

2. Negotiate better terms with vendors

Take a closer look at your company’s vendors and spot areas for improvement. Search for opportunities to renegotiate payment terms with suppliers.

You want to see if you can secure longer payment periods (e.g., 60 days instead of 30) to help extend your cash runway. This gives you more time to generate revenue and collect payments from customers. 

By cutting costs and delaying payments, you can stretch your company’s resources further and avoid needing quick cash infusions. 

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3. Increase revenue with quick wins 

If you want to see cash in your metaphorical pockets sooner rather than later, boosting revenue is the way to go. It's a faster way to get liquid without having to slash expenses or ask for loans.

Here are a few ideas for some quick wins: 

• Launch some flash sales or special offers to get people excited and buying more.
• Suggest some add-ons or related products to your existing customers. They already trust you, so they're more likely to say yes.
• Offer discounts for paying upfront or sign them up for subscriptions to get cash flowing in faster.

When you bring in revenue quickly, it directly boosts your operating funds. This lets you keep things running smoothly without major changes to how you operate.

4. Secure short-term financing

Short-term financing refers to any loan or credit facility with a repayment period of less than one year.

This type of financing is useful for addressing immediate funding needs, managing cash flow fluctuations, and acquiring relatively low-valued but important assets and/or opportunities.

Here's how to do it: 

• Get a line of credit or a short-term loan: This gives you access to cash when you need it.
• Use invoice factoring: Get paid upfront for your invoices instead of waiting for customers to pay.
• Talk to your vendors: See if they'll give you more time to pay or offer financing options. 

The big win? 

Short-term financing gives you breathing room. You can focus on fixing things without having to shut down your business.

Just remember that borrowed money isn't free cash: subtract any drawn credit from your cash balance when you recalculate runway.

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5. Shift focus to high-margin products or services

To extend your cash runway, focus on the products or services that make you the most money. These have higher profit margins, so each sale contributes more to your bottom line.

First things first, figure out which products or services make you the most money. Once you know your top earners, make sure everyone's working together to use resources wisely and market them effectively. 

Over time, you can gradually phase out or de-emphasize the products that aren't making you much money or are even losing you money.

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