Essential SaaS Metrics Every Founder Should Track

If you run a SaaS company, metrics are your dashboard. Without them, you are flying blind. The problem: there are dozens of metrics, and most founders do not know which ones actually matter. At Growth Lab, we help SaaS companies turn metrics into growth decisions. Our strategies have contributed to over $10M+ in client revenue. Here are the metrics every SaaS founder needs to master.

MRR (Monthly Recurring Revenue)

Definition

MRR is the predictable revenue your SaaS generates each month. It is the foundational metric for any SaaS business.

Formula

MRR = Number of paying customers x Average Revenue Per Account (ARPA)

Example: 200 customers x $75 CAD/month = $15,000 CAD MRR

MRR Components

New MRR: Revenue from new customers this month
Expansion MRR: Additional revenue from existing customers (upsells, add-ons)
Churned MRR: Revenue lost from customers who cancel
Net New MRR = New MRR + Expansion MRR - Churned MRR

What "Good" Looks Like

Growth: 10-20% Net New MRR per month for a growth-stage SaaS
ARR (Annual Recurring Revenue): MRR x 12. Use ARR when communicating with investors

Marketing Impact

Marketing directly influences New MRR by generating qualified leads and free trials that convert to paying customers.

CAC (Customer Acquisition Cost)

Definition

CAC measures how much it costs to acquire a new paying customer. It is the metric every founder should check before investing another dollar in marketing.

Formula

CAC = Total marketing and sales spend / Number of new customers acquired

Example: $30,000 CAD spent on marketing + sales in March / 50 new customers = $600 CAD CAC

What "Good" Looks Like

Self-serve SaaS (PLG): CAC of $50-200 CAD
Mid-market SaaS: CAC of $500-2,000 CAD
Enterprise SaaS: CAC of $2,000-10,000 CAD

CAC by Channel

Calculate CAC for each marketing channel separately:

Google Ads CAC
LinkedIn Ads CAC
Organic CAC (SEO/content)
Referral CAC

This tells you where to invest more and where to cut.

Common Trap

Do not calculate CAC by including only ad spend. Include marketing salaries, tools, agencies, and sales team time. The "real" CAC is always higher than founders think.

LTV (Lifetime Value)

Definition

LTV represents the total revenue a customer generates over their entire relationship with your SaaS.

Formula

LTV = ARPA x Gross Margin x Average Customer Lifespan

Or the simplified version:

LTV = ARPA / Monthly Churn Rate

Example: $75 CAD/month / 3% monthly churn = $2,500 CAD LTV

What "Good" Looks Like

LTV alone tells you nothing. It is the LTV/CAC ratio that matters.

LTV/CAC Ratio

Definition

The LTV/CAC ratio measures the profitability of your customer acquisition. It is the single most important metric for evaluating the health of your business model.

Formula

LTV/CAC = LTV / CAC

Example: $2,500 CAD / $600 CAD = 4.2x

What "Good" Looks Like

Below 1x: You are losing money on every customer. Emergency
1-3x: Not profitable enough. Optimize CAC or improve retention
3-5x: Healthy zone. You can invest more in growth
Above 5x: Excellent, but you might be under-investing in acquisition. Accelerate

Marketing Impact

Marketing impacts both sides of the ratio:

Lower CAC: Better targeting, better content, better conversion rates
Increase LTV: Better onboarding, better engagement, retention campaigns

At Growth Lab, our campaigns target 4%+ conversion rates, which directly reduces CAC.

Churn Rate

Definition

Churn rate measures the percentage of customers who cancel their subscription each month.

Formulas

Customer Churn Rate = Customers lost this month / Customers at start of month x 100

Revenue Churn Rate = MRR lost this month / MRR at start of month x 100

Revenue Churn matters more than Customer Churn. Losing 10 customers at $20/month is less painful than losing 1 customer at $2,000/month.

What "Good" Looks Like

B2C SaaS: 5-7% monthly churn is acceptable
B2B SaaS (SMB): 3-5% monthly churn
B2B SaaS (Enterprise): Under 1% monthly churn
Net Revenue Retention above 100%: The ultimate goal — existing customers generate more revenue each month even without new customers

How Marketing Reduces Churn

Educational content that increases product usage
Reactivation email campaigns for inactive users
Optimized onboarding that accelerates the "aha moment"
Loyalty programs and community building

ARPA (Average Revenue Per Account)

Definition

ARPA measures how much each customer pays on average per month.

Formula

ARPA = MRR / Number of paying customers

Example: $15,000 CAD / 200 customers = $75 CAD

What "Good" Looks Like

Depends on your segment:

Self-serve: $15-50 CAD/month
SMB: $50-500 CAD/month
Mid-market: $500-5,000 CAD/month
Enterprise: $5,000+ CAD/month

How to Increase ARPA

Well-structured pricing tiers with an attractive premium plan
Usage-based or feature-based upsells
High-perceived-value optional add-ons
Annual price increases of 5-10% (communicated transparently)

NRR (Net Revenue Retention)

Definition

NRR measures the change in revenue from your existing customer base, including expansions, contractions, and churn.

Formula

NRR = (Starting MRR + Expansion MRR - Churned MRR - Contraction MRR) / Starting MRR x 100

What "Good" Looks Like

Below 90%: Critical retention problem
90-100%: Okay, but growth depends entirely on new customers
100-110%: Good. Your existing customers are growing
110%+: Excellent. This is the level of top SaaS companies (Slack, Datadog, etc.)

An NRR of 110% means that even if you stop acquiring new customers, your revenue grows 10% per year from the existing base alone.

Payback Period

Definition

How many months it takes to recover the cost of acquiring a customer.

Formula

Payback Period = CAC / (ARPA x Gross Margin)

Example: $600 CAD / ($75 CAD x 80%) = 10 months

What "Good" Looks Like

Under 6 months: Excellent. Rapid growth is possible
6-12 months: Good. Standard for B2B SaaS
12-18 months: Acceptable for enterprise
Over 18 months: Problematic. Your CAC is too high or your ARPA is too low

The Essential SaaS Dashboard

Here are the metrics to track every month, in this priority order:

1. Net New MRR — Is your SaaS growing? 2. LTV/CAC ratio — Is your growth profitable? 3. Customer churn rate — Are you retaining customers? 4. NRR — Are existing customers generating more revenue? 5. CAC by channel — Where should you invest your next dollar? 6. Payback period — How fast are you recovering your investment? 7. ARPA — How much is each customer worth?

Turn Your Metrics into Growth

Metrics without action are useless. At Growth Lab, we use these indicators to build marketing strategies that lower CAC, increase conversion, and accelerate MRR growth. Our clients achieve 5x+ ROAS on their paid campaigns. Book a free audit and we will analyze your SaaS metrics to identify the highest-impact growth levers.