GTM metrics that matter: CAC, payback and sales cycle explained

If you want to measure your go-to-market (GTM for short, meaning the way you bring your offer to market and sell it), you do not need twenty metrics. Three are enough to start: CAC (customer acquisition cost, the cost of winning one customer), payback (how long it takes a customer to earn that cost back), and the sales cycle (the time from first contact to a signed deal). These GTM metrics tell you honestly whether your sales effort is working or quietly burning money.

This article explains each metric in plain language, with worked examples in CHF and concrete scenarios from everyday Swiss SME and agency life. No buzzword bingo, just numbers you can act on by Monday.

Why measure GTM metrics at all?

Many small teams sell on instinct. That works for a while. But the moment you spend more budget or start a second sales channel, you need numbers to decide where your money works hardest.

Metrics do not replace selling. They simply make it visible. A good relationship, the right timing and a clear offer remain human work. The numbers only tell you which of those efforts pay off.

Three questions are answered by the metrics covered here:

• What does a new customer cost? That is CAC.
• When do I earn that cost back? That is payback.
• How long does a deal take? That is the sales cycle.

Know these three and you make better decisions about channels, pricing and hiring. Without them, you are guessing. For the broader picture, see our guide to go-to-market for Swiss SMEs.

What is CAC and how do you calculate it?

CAC is the sum of all sales and marketing costs in a period, divided by the number of new customers won in that period. It sounds simple, and it is, as long as you count honestly.

The formula:

CAC = (marketing costs + sales costs) / number of new customers

Costs include not only advertising but also a share of salaries, tool subscriptions and agency fees. Counting only ad spend flatters your CAC.

Worked example: a fiduciary office in Zurich

Take a small fiduciary office that wants to win new mandates. In one quarter it spends:

• CHF 4'500.00 on Google Ads and LinkedIn
• CHF 3'000.00 as a share of the salary for the person handling enquiries and meetings
• CHF 500.00 on CRM and other tools

That is CHF 8'000.00 in total costs. In this quarter it wins 8 new mandates. So the CAC is CHF 1'000.00 per customer. Whether that is good or bad depends on what a mandate is worth over time, which we get to next.

What does payback mean?

Payback answers the most important question for a budget-aware team: when do I get back the money I spent to win a customer? Only after that does the customer actually start earning something for you.

The formula:

Payback (months) = CAC / monthly contribution margin per customer

The contribution margin is the monthly revenue minus the direct costs of serving that customer. For a service business this is often a large share of revenue; for a product business, less.

Worked example: the fiduciary office continued

The fiduciary office has a CAC of CHF 1'000.00. An average mandate pays CHF 350.00 per month, and the direct cost of serving it is CHF 150.00. So the monthly contribution margin is CHF 200.00.

Payback = CHF 1'000.00 / CHF 200.00 = 5 months.

After five months the won customer is paid off. If the mandate stays an average of three years, the remaining 31 months are profit. A payback under twelve months is a good sign for most Swiss SMEs. If it gets longer, you need either cheaper acquisition or more revenue per customer.

What is the sales cycle and why does it matter?

The sales cycle is the average time from the first serious contact to a closed deal. For a 50-franc product that is minutes. For software sold to a mid-sized firm it can be months.

The sales cycle matters because it shapes your cash flow. A long cycle means you pay acquisition costs today but only see the revenue half a year later. For a small team, that is a real liquidity issue.

Here is how to measure it:

1. Define when a lead becomes «serious», for example at the first meeting.
2. Record that date in your CRM.
3. Record the closing date.
4. Take the average of the days between them across all won deals.

If you keep this tidy in your CRM, the number almost falls out by itself. That is exactly what a lean CRM is for: not to torment you with fields, but to capture the few data points that later make decisions possible.

How do the three metrics fit together?

The three metrics only tell a story together. A low CAC helps little if the sales cycle lasts a year and you cannot pay the rent in the meantime. A short payback is worthless if the CAC is so high that you only win a handful of customers.

Here is a simple way to read the values:

A healthy picture looks like this: a moderate CAC, payback within a year, and a sales cycle your cash flow can carry. If one of the three runs out of line, you know where to focus.

What does this look like in an agency?

Agencies are in a special position: they measure their own metrics and their clients' at the same time. That is an opportunity. If you offer GTM as a service, you can set it up for several clients, hand it over, and build recurring revenue from it.

Worked example: a marketing agency with five clients

A small agency runs GTM for five SMEs. For its own acquisition it spends CHF 6'000.00 per quarter and wins two new mandates. So its own CAC is CHF 3'000.00 per client.

That sounds high, but an agency mandate pays CHF 2'500.00 per month at a contribution margin of CHF 1'500.00. So payback is just 2 months. Because agency clients tend to stay longer, that high CAC is perfectly defensible.

For its clients, the agency sets up the same measurement: CAC, payback, sales cycle. That way it delivers not just leads, but proof that the work is paying off. For how to build this systematically, see our piece on a lean GTM strategy on a low budget.

Which further metrics are worth it later?

Once the three basics are in place, you can add carefully. Do not overdo it: every new metric must improve a decision, or it is just work.

• Conversion rate per stage: how many leads become meetings, how many meetings become customers? Shows where the funnel leaks.
• Customer lifetime value (CLV): the total contribution margin a customer brings over time. Only against the CAC does the CAC become truly judgeable.
• Win rate: the share of proposals that close.

A useful rule of thumb is the ratio of CLV to CAC. If it is roughly 3 to 1 or higher, your GTM is usually healthy. If it is 1 to 1, you barely earn anything on new customers. You can see how the channels behind these numbers compare in our GTM models compared.

Common mistakes with GTM metrics

Most mistakes happen not in the maths but in the definitions. These are the ones you see most often:

• Counting only ad spend. Leaving out salaries and tools gives you a far too flattering CAC, and you wonder later where the profit went.
• Using revenue instead of contribution margin for payback. That shortens the number artificially. Always work with what is left after direct costs.
• Never measuring the sales cycle. Without it you underestimate how long your money is tied up.
• Too many metrics too soon. Three clean numbers are worth more than twenty neglected ones.
• Recording data nowhere. If meetings and deals live only in your head, nothing can be analysed. That is exactly what a CRM is for.

How does a lean CRM help with measuring?

You do not need a big platform to track these metrics. Large providers like HubSpot do a lot and are fair for teams that use all of it. But most Swiss SMEs do not need a whole system, just a lean CRM and a few focused channels.

A good, simple CRM takes care of exactly the steps the metrics need:

• It records when a lead started and when it closed, which gives you your sales cycle.
• It shows how many customers were won in a period, the basis for CAC.
• It makes the funnel visible without you maintaining spreadsheets.

AI assists where it makes sense, for example by suggesting the next step or summarising a thread. But it does not replace your judgement or the relationship with the customer. And your data stays in Switzerland. You can see what that looks like in practice on our functions and integrations pages.

Step by step: set up your first measurements

Here is how to get reliable numbers in an afternoon:

1. Pick a period, for example the last quarter.
2. Add up all marketing and sales costs, including a share of salaries and tools.
3. Count the customers won in that period and calculate the CAC.
4. Work out the monthly contribution margin per customer and calculate payback.
5. Check your CRM for the days between first meeting and close, which is your sales cycle.
6. Note all three values in one place and repeat the measurement every quarter.

By the second time you already see trends. And trends are worth more than a single perfect value.

Frequently asked questions

How often should I measure these metrics?

For most SMEs a quarterly rhythm is enough. If you move a lot of ad budget, look monthly. More important than frequency is that you always calculate the same way, so the values stay comparable.

What is a good CAC for a Swiss SME?

There is no universal figure, because it depends on customer value. The better question is the ratio: if your CLV is at least three times your CAC, you are usually on safe ground.

Do I need expensive software to measure the sales cycle?

No. You only need two date fields per deal: start and close. A lean CRM handles this in passing, and a tidy spreadsheet is enough to begin with.

Should I use revenue or contribution margin?

For payback, always the contribution margin, meaning revenue minus direct costs. Otherwise the break-even looks faster than it is, and you decide on the wrong basis.

How do I lower a CAC that is too high?

Usually through a sharper customer profile and more focused channels. Knowing exactly who you address wastes less budget. You can also compare what each channel costs on our pricing page.

What if my numbers look bad?

Then you have learned something valuable before it got expensive. Bad numbers are not a verdict but a hint of where to act, whether on the CAC, the offer or the process.

Just get started

GTM metrics do not have to be complicated. CAC, payback and the sales cycle are enough to make honest decisions, and you can run them with a small team and a modest budget. The only thing that matters is that you capture the data at all.

That is exactly what Advanzo is built for: a deliberately simple CRM that gives you the basis for your metrics without overwhelming you. You can start for free, no credit card, and your data stays in Switzerland. Try it at advanzo.app and see how quickly gut feeling turns into reliable numbers.