The 6 SaaS Metrics Every Founder Should Track Every Month

Short answer

Six numbers cover most of it: cash in the bank, net burn, runway (cash ÷ net burn), LTV:CAC, CAC payback period, and the burn multiple. The first three tell you how long you last; the last three tell you whether growth is efficient. Check them monthly on one screen, against benchmarks, and trends will warn you early.

The median SaaS company now spends about $2.00 to win a single dollar of new ARR, up 14% year over year, according to 2025 SaaS benchmark data. Acquisition got more expensive, payback got slower, and the founders who noticed did so because they were watching a short list of numbers every month. You don't need a forty-metric dashboard. The SaaS metrics every founder should track fit on one screen, and there are six of them.

Which financial KPIs should a startup founder track every month?

Split the six into two jobs. Three measure survival: how long you last. Three measure efficiency: whether the growth you're buying is worth it. Here's the full set at a glance, then each one in turn.

1. Cash in the bank

The one number nobody can argue with. Know it to the day, not the month, and know it net of anything already committed: payroll you owe, a tax bill due, an invoice you've promised to pay. Cash is the metric every other one exists to protect, and it's the reason survival sits at the top of any startup finance dashboard.

Bad reading: dropping toward six months of burn with no plan to raise or cut. That's not a yellow flag, it's a red one.

2. Net burn

How fast the cash is leaving: everything paid out minus everything collected, per month. Read it from your bank, not your P&L, and average it over three months so one lumpy month doesn't mislead you. Watch the trend. Burn creeping up while revenue stays flat is the early signature of a company losing efficiency.

Bad reading: burn rising faster than revenue, month after month.

3. Runway

Cash divided by net burn, expressed in months. This is your countdown, and the single most useful number for timing decisions. The working target across venture is 18–24 months after a raise, because a fundraise eats roughly six months and you need real time to hit milestones in between. When runway drops under 12 months, it should start bending your other choices. The full method, including the traps that inflate it, is in how to calculate runway. (German founders search the same figure as Startup Kennzahlen; the maths doesn't change across borders.)

Bad reading: under 12 months with no raise or cut in motion.

4. LTV:CAC

Now the efficiency half. LTV:CAC compares the lifetime value of a customer to what you paid to acquire them. Lifetime value is roughly average revenue per account times gross margin, divided by churn; acquisition cost must be fully loaded, including sales salaries and tools, not just ad spend. The durable LTV to CAC ratio benchmark is 3:1 as a floor, with healthy companies between 3:1 and 5:1.

The mistake founders make is assuming higher is always better. Above 5:1 with modest growth, investors read under-investment rather than excellence; you could profitably spend more to grow faster.

Bad reading: below 3:1, where each new customer erodes value once you price in the cost of capital.

5. CAC payback period

The time-based sibling of LTV:CAC, and often the first place a problem surfaces because it doesn't rely on optimistic lifetime assumptions. It measures how many months of gross-margin revenue it takes to earn back the cost of winning a customer. A 2025 private-SaaS survey of more than 400 companies put the median CAC payback period near 18 months, with top-quartile teams around 12. Faster is better, and the direction of travel matters more than any single reading.

Bad reading: payback lengthening with each new cohort. You're paying more to acquire customers who are worth the same or less.

6. Burn multiple

Net burn divided by net new ARR over the same period, introduced by David Sacks of Craft Ventures in 2020. It answers what each euro of burn produced in kept revenue: under 1x is excellent, 1–1.5x great, and above 2x is a flag. It's the hardest of the six to game, which is exactly why investors like it. Keep this one short here; the mechanics, the scale and a full worked example live in the burn multiple in depth.

Bad reading: sustained above 2x, meaning growth is costing more than €2 of cash per €1 of durable revenue.

Read the SaaS metrics every founder should track as a set

A single metric rarely means much; the picture is in the combination. Here's one month on a realistic dashboard:

• Cash: €1.4M
• Net burn: €95K
• Runway: ~15 months
• LTV:CAC: 3.2:1
• CAC payback: 16 months
• Burn multiple: 1.7x

Read as a set, this company has time (15 months) and unit economics that clear the 3:1 bar, but a 16-month payback and a 1.7x burn multiple say growth is running on the expensive side. The right move isn't to panic or to slam the brakes; it's to tighten acquisition efficiency before adding more spend, and to recheck next month. That's the whole point of a monthly cadence: you catch the drift while it's still cheap to fix.

These six are your operating view. The overlapping set an investor grades you on at a raise, Rule of 40 and the rest, is covered in the metrics investors judge you on.

What this means for you

Build the dashboard once, then protect the habit. Put all six on a single screen, add last month and the month before so you see the trend, and review it in the first week after the books close. Your own salary is a line inside burn, so set it on purpose rather than by accident; see how to pay yourself as a founder. If any of these terms are new, the plain-English tour in the finance basics every founder needs will get you fluent fast. Six numbers, thirty minutes a month, is the difference between steering and being surprised.