SaaS metrics every founder should track

SaaS metrics every founder should track 

TLDR:
SaaS metrics help founders understand whether growth is healthy, sustainable and cash-efficient. The most important numbers to track include MRR, ARR, churn, net revenue retention, customer acquisition cost, customer lifetime value, gross margin, cash burn and runway.

When you are growing a SaaS business, it is easy to focus on the obvious numbers.

How much revenue came in this month? How many customers signed up? How many demos were booked? How much cash is in the bank?

Those numbers matter, but they do not always show the full picture.

A SaaS business can look like it is growing while still losing too many customers, spending too much to win new ones or running out of cash faster than expected.

That is why SaaS metrics are so useful.

The right SaaS metrics help founders understand whether growth is healthy, repeatable and financially sustainable. They show what is working, where the risks are and what needs to change before problems become urgent.

In this guide, we explain the SaaS metrics every founder should track in plain English.

What are SaaS metrics?

SaaS metrics are the numbers that help you understand how a software as a service business is performing.

They are especially useful because SaaS businesses usually rely on recurring revenue. The goal is not just to win new customers. The goal is to keep them, grow their value and make sure the business has enough cash to keep scaling.

Common SaaS metrics include:

1. Monthly recurring revenue
2. Annual recurring revenue
3. Churn
4. Net revenue retention
5. Customer acquisition cost
6. Customer lifetime value
7. Gross margin
8. Cash burn
9. Cash runway

You do not need to track every possible metric from day one. It is better to track a small number of useful metrics consistently than to create a complicated dashboard nobody uses.

Stripe also provides a useful overview of the key SaaS metrics businesses can use to assess recurring revenue and growth

Why SaaS metrics matter

SaaS metrics matter because they help founders make better decisions.

Without clear metrics, decisions are often based on instinct, pressure or incomplete information. That can lead to hiring too quickly, spending too much on marketing, missing churn problems or raising funds later than needed.

With clear reporting, you can see what is really happening in the business.

For example, revenue may be growing, but churn may also be increasing. New customers may be signing up, but acquisition costs may be too high. Cash may look healthy today, but your runway may be shorter than expected.

Good SaaS metrics help you spot these issues early.

They are also useful for investor updates, board packs, funding conversations and internal planning. Investors do not just want to see growth. They want to understand the quality of that growth.

HubSpot’s guide to SaaS metrics also covers how these measures can help businesses assess customer retention and growth

Monthly recurring revenue

Monthly recurring revenue, often called MRR, shows the predictable subscription revenue your business expects to receive each month.

This is usually one of the most important SaaS metrics because it shows the current size of your recurring revenue base.

MRR should normally exclude one off income, such as setup fees, consultancy work or project fees. The point is to focus on revenue that should repeat.

It is also useful to break MRR down into:

1. New MRR from new customers
2. Expansion MRR from upgrades or extra users
3. Contraction MRR from downgrades
4. Churned MRR from cancelled customers
5. Net new MRR after all movements are included

This gives you a much clearer story.

For example, total MRR might have increased by £5,000 this month. That sounds good. But if you gained £12,000 of new MRR and lost £7,000 through churn, there may be a retention issue underneath the growth.

Annual recurring revenue

Annual recurring revenue, often called ARR, is the yearly value of your recurring subscription revenue.

A simple way to think about it is:

Monthly recurring revenue x 12 = annual recurring revenue

ARR is useful because it gives a bigger picture view of the business. It is often used in investor conversations, valuations and growth planning.

However, ARR should not be reviewed on its own. A business with £1 million of ARR may look strong, but the quality of that revenue depends on other factors.

For example:

1. How much revenue is being lost through churn?
2. How much cash is being spent to grow ARR?
3. Are customers upgrading or downgrading?
4. Are gross margins healthy?
5. Is growth coming from the right type of customer?

The aim is not just to grow ARR. The aim is to grow recurring revenue that is reliable, profitable and supported by a sustainable business model.

Churn

Churn is the rate at which customers cancel, downgrade or stop using your product.

For SaaS businesses, there are two useful ways to look at churn:

1. Customer churn: the number of customers you lose over a set period
2. Revenue churn: the amount of recurring revenue you lose through cancellations or downgrades

Both matter.

Customer churn helps you understand whether people are staying with your product. Revenue churn helps you understand the financial impact when customers leave or reduce their subscriptions.

For example, losing ten small customers may look worrying, but losing one large customer could have a much bigger impact on revenue.

High churn may suggest that customers are not seeing value quickly enough, onboarding needs improvement, pricing is not quite right or the wrong type of customer is being acquired.

Low churn gives you more confidence to invest in growth. If customers stay for longer, each new customer becomes more valuable.

Net revenue retention

Net revenue retention looks at how much revenue is kept from existing customers after upgrades, downgrades and cancellations.

It answers a very useful question:

If you did not win any new customers, would your revenue from existing customers grow, shrink or stay the same?

This is one of the most helpful SaaS metrics because it shows whether your current customers are becoming more valuable over time.

Strong net revenue retention usually means customers are staying, upgrading or adding more users. Weak net revenue retention may mean cancellations and downgrades are cancelling out growth.

For founders, this metric connects several parts of the business, including product value, customer success, pricing, account management and retention.

Customer acquisition cost

Customer acquisition cost, often called CAC, shows how much it costs to win a new customer.

A simple way to calculate it is:

Sales and marketing costs ÷ number of new customers = customer acquisition cost

For example, if you spend £10,000 on sales and marketing in a month and win 20 new customers, your average customer acquisition cost is £500.

CAC helps you understand whether your growth is efficient.

If you are spending more and more to win each customer, you may need to review your marketing channels, sales conversion rates, pricing, target customer profile or demo to close rate.

It is also worth reviewing CAC by customer type or channel. Customers from paid ads may cost more than customers from referrals. Larger customers may cost more to win, but they may also stay longer and spend more.

A single average CAC figure can hide important detail.

Customer lifetime value

Customer lifetime value, often called LTV, estimates how much value a customer may bring to your business over the time they stay with you.

This metric helps you compare what a customer is worth with what it costs to acquire them.

For example, spending £500 to acquire a customer may be fine if that customer is likely to generate £5,000 of value over time.

But spending £500 to acquire a customer who cancels after two months may not be sustainable.

LTV depends on several things, including how much the customer pays, how long they stay, whether they upgrade, how much it costs to serve them and your gross margin.

It is not a perfect number, but it can help founders make better decisions about pricing, marketing spend and customer retention.

Gross margin

Gross margin shows how much revenue is left after the direct costs of delivering your product.

For a SaaS business, direct costs may include hosting, infrastructure, software tools used to deliver the service, customer support, payment processing costs and other direct delivery costs.

Gross margin helps show how scalable the business is.

A strong gross margin means more of your revenue is available to fund product development, sales, marketing, people and profit.

A weak gross margin may suggest that the product is too expensive to deliver, pricing needs to be reviewed or support costs are too high.

This metric becomes more important as the business grows. If revenue doubles but delivery costs also double, the business may not be scaling as efficiently as expected.

Cash burn and runway

Cash burn shows how much cash the business is spending each month.

Cash runway shows how long the business can continue before cash runs out, based on current cash reserves and monthly burn.

For example, if the business has £300,000 in the bank and is spending £30,000 a month, the runway is around 10 months.

Runway is one of the most important numbers for any startup or fast growth company.

It helps answer practical questions, such as:

1. Can we afford to hire?
2. When do we need to raise funding?
3. What happens if sales are slower than expected?
4. How long can we keep investing in growth?
5. When do we expect to reach break even?

A business can have growing revenue and still face cash pressure. That is why cash burn and runway should be reviewed alongside MRR, ARR and churn.

How to build a simple reporting pack

A useful reporting pack does not need to be complicated.

For many SaaS and tech startups, a monthly reporting pack could include:

1. Profit and loss account
2. Balance sheet
3. Cash flow forecast
4. MRR and ARR summary
5. Churn analysis
6. Customer acquisition cost
7. Gross margin
8. Cash burn and runway
9. Short commentary on what changed
10. Actions for the next month

The commentary is important.

Numbers alone do not always help people make decisions. A good reporting pack explains what the numbers mean.

For example, MRR increased because existing customers upgraded. Cash burn increased because of planned hiring. Churn increased in smaller customers but remained low in larger accounts.

This turns the reporting pack from a spreadsheet into a decision making tool.

Common mistakes to avoid

Many founders start tracking SaaS metrics, but the numbers can become messy if there is no clear process.

Common mistakes include:

1. Tracking too many metrics
2. Changing the formulas each month
3. Focusing only on revenue growth
4. Ignoring churn
5. Not reviewing cash runway regularly
6. Mixing recurring and one off revenue
7. Looking at average CAC without enough detail
8. Creating reports for investors but not using them internally

The best approach is to keep the reporting simple, consistent and useful.

Start with the numbers that help you make better decisions. Then build from there as the business grows.

How AGILE Accountants can support startup reporting

SaaS metrics are useful, but they become much more valuable when they are connected to the wider financial picture.

A founder may know MRR, churn and runway, but still need help understanding what those numbers mean for cash flow, hiring, tax planning, funding and long term growth.

AGILE Accountants works with limited companies, tech startups and fast growth businesses that need more than basic year end compliance. This includes monthly support, management accounts, forecasts, cash flow planning and practical financial advice throughout the year.

AGILE Accountants supports founders and fast growth companies as accountants for tech startups, helping with management accounts, cash flow forecasts, tax planning and financial reporting.

The goal is not to track metrics for the sake of it. The goal is to use those metrics to make better decisions.

Final thoughts on SaaS metrics

SaaS metrics help founders understand what is really happening in the business.

They show whether revenue is recurring, whether customers are staying, whether growth is efficient and whether the company has enough cash to keep moving forward.

You do not need a complicated dashboard full of numbers nobody uses. You need a simple, consistent reporting process that helps you make better decisions each month.

For a growing SaaS or tech business, clear reporting can make the difference between reacting too late and planning with confidence.

AGILE Accountants can help you build clear reporting, management accounts and forecasts that support smarter growth.