Understanding your business cash flow and cash burn rate is essential for entrepreneurs. Without the capital to keep your business afloat, even the best ideas will fail. So it’s no wonder that 32% of founders were worried that they were spending too much cash¹. By better understanding your business finances, you can plan ahead and make smart decisions.
In this article, we'll define what cash burn really is, look at the different types of cash burn, and consider different strategies to help manage it.
Wise Business can help you optimise your cash flow and reduce unnecessary expenses by offering low-cost international transfers and multi-currency accounts.
A cash burn rate shows how quickly a startup is spending money before reaching a positive cash flow. It's a really helpful concept for early-stage startups who are still to turn a profit to consider how long their current funds will last before they need more capital investment. Potential investors may consider a startups cash burn rate when deciding whether or not to fund a venture.
Cash burn can take different forms. We'll take a few moments to define both gross and net cash burn to help bring clarity on what makes them distinct from each other.
Gross cash burn rate tells you how much you’re spending each month, across the whole business. It’s the **entire amount **of cash going out of your business across a given period. This helps you know how much money you need to keep your doors open. It’s useful as it gives you an insight into your business’ cost drivers and efficiency, regardless of your revenue.
On the other hand, a net cash burn rate measures your monthly spending after you’ve factored in your revenue. Put simply, it is your monthly revenue subtracted from monthly operating expenses, showing how much money your startup is losing each month. As it includes your revenue, your net cash burn rate tends to fluctuate more than your gross rate as the amount of money you’re making can change each month.
Understanding your cash burn rate and knowing how to calculate it can help you prepare for conversations with potential investors. Let's look at how you can work out the bottom line and that final key figure.
Calculating your gross cash burn rate is fairly straightforward. You simply add up all your expenses in a month. If you have annual expenses, you may want to add up your expenses for a year, and then divide them by 12.
Example
You own a gym. Each month you spend money on rent, electricity and heating. You also invest in new equipment every six months. Over the year, your expenses are as follows:
Rent: £500 per month = £6000 a year
Electricity: £250 per month = £3000 a year
Heating: £320 per month = £3840 a year
New equipment: £2000 every 6 months = £4000 a year
Total annual expenses = £6000 + £3000 + £3840 + £4000 = £16,840
Gross cash burn rate (annual) = Total annual expenses
Gross cash burn rate (annual) = £16,840
Gross cash burn rate (monthly) = Total annual expenses ÷ 12
Gross cash burn rate (monthly) = £16,840 ÷ 12
Gross cash burn rate (monthly) =£1,403.33
Calculating your net cash burn rate is the same as your gross rate, plus an additional step. Once you’ve worked out your total expenses (your gross cash burn rate), you then subtract your revenue from it.
Example
As the gym owner, you’ve worked out that your total expenses for the year are £16,840. Your revenue is as follows:
Q1: £1500
Q2: £3500
Q3: £2750
Q4: £2500
Total revenue: £1500 + £3500 + £2750 + £2500 = £10,250
Net burn rate (annual) = Total annual expenses - Total annual revenue
Net burn rate (annual) = £16,840 - £10,250
Net burn rate (annual) = £6,590
Net burn rate (monthly) = (Total annual expenses - Total annual revenue) ÷ 12
Net burn rate (monthly) = £6,590 ÷ 12
Net burn rate (monthly) = £549.17
| 💡 Explore our complete guide to cashfllow management |
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By looking at the different aspects which change the cash burn rate, whether positively or negatively, you can make strategic decisions accordingly to help your business take its next step.
Established businesses also need to consider a number of these factors, even if their burn rate tends to be more steady, with more stable expenses and revenue. Make sure to pay attention to inefficient spending as it’s easy to continue spending money on things that are no longer contributing to the growth of your business such as unused software or equipment.
The industry that you’re operating in can also have an impact on your cash burn rate. This is because some industries require a large upfront investment in order to create a viable product or service. One person, service-based businesses, such as a freelance copywriter, tend to have relatively low cash burn rates as they have very few overheads, allowing them to achieve profit earlier.
In contrast, a tech startup can have quite a high burn rate due to needing to spend large amounts of money on research and development and customer acquisition. Biotechnology and pharmaceutical businesses also tend to have high burn rates due to regulatory costs and the necessity for clinical trials, with a burn rate potentially exceeding £150,000 per month³.
Operational efficiency refers to the relationship between what a company is spending and the money coming in. The more efficient a company is, the lower the cash burn rate will be. You can make your operations more efficient by reducing your costs. You can begin this process by auditing your spending, making sure that you’re not spending money unnecessarily. This will decrease your burn rate without putting up prices.
Now that we’ve established what cash burn is and the factors that influence it, we can look at how to manage it to keep your startup financially healthy. Here are some tips to help you control and reduce your cash burn.
Extending your runway means that you have more time before your cash runs out. You can calculate your cash runway by dividing your total cash by your net burn rate. A good runway to aim for is 24 to 36 months⁴.
Example:
The gym owner has £10,000 in their bank account.
Their monthly net burn rate is £549.17.
Their runway = £10,000 ÷ £549.17 = 18.2
The gym owner’s business can survive for 18 months under the current conditions.
You can extend your runway so that you have more time available by:
| 💡 Read more about extending your cash runway |
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When done effectively, cost-cutting can increase your business’ profitability, improve your cash flow, and keep your cash burn rate down. However, when done poorly, cost-cutting measures can have a negative impact on staff morale, public reputation, and prevent future growth. Therefore, it’s quite a delicate line to walk. When cutting costs, you should focus on:
The alternative to cost-cutting is to generate more revenue. By increasing the amount of money coming in, your expenses are proportionately less. You can increase your revenue by increasing your sales, increasing prices, and retaining customers. As a result, your net cash burn will decrease, giving you more runway.
Whether you have a high or low cash burn, these are some final aspects that you may want to consider.
A high burn rate indicates that a business is spending money quickly. This may prove to be unsustainable as the company may become bankrupt before they generate enough revenue. On the other hand, a low burn rate signals that the startup is spending money slowly. While this can be a positive, it may also indicate that a business isn’t spending strategically, preventing future growth. You may want to consider what the right balance for you and your business is.
When it comes to external investment, both types of burn rates can bring challenges. If an external investor, such as a venture capitalist, invests in you, they may well want to see a higher burn rate as they’ve given you the money to spend and know that higher investment can lead to higher growth. On the other hand, too high a burn rate can suggest reckless spending. A low burn rate can indicate stability, however, some investors may then have questions over the company’s potential to grow and its scalability.
Investing money in a business is often the key to stimulating growth. In fact, funding is now the top priority for entrepreneurial businesses preparing for acquisitions⁵. Therefore, a high burn rate can indicate this investment and commitment to growth. However, if the growth is too fast or the money invested hugely outstrips the pace of revenue increasing, the startup won’t survive. Keeping the goal of having 24 to 36 months⁴ of runway in mind will help you strike the right balance between frugality and growth.
Understanding and managing your cash burn rate as a startup is essential. By keeping an eye on the money coming in and out of your account, you can calculate how much money you need to spend every month and how long your business is viable for. By monitoring it closely, you can spend with confidence or scale back some months, depending on what the burn rate is telling you. It’s also important to get to grips with this if you’re seeking external investment as potential investors may question you on your burn rate.
Wise Business can help you manage cash burn by offering international transfers at a mid-market exchange rate and multi-currency cards, reducing fees associated with traditional banking. This is also a particularly helpful feature if you pay for any product or services in a different currency. In addition, Wise Business has no monthly fees, so isn’t contributing to your expenses.
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Sources used:
Last accessed on 16-Oct 2025
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