15 Growth Marketing Metrics Every Marketer Must Track

Stop Tracking Vanity Metrics

Impressions, followers, and page views feel good but rarely correlate with business outcomes. Growth marketers track metrics that directly connect to revenue and retention.

After years of managing Rs 2Cr+ ad budgets and driving 40,000+ signups, here are the 15 metrics I actually check every week - organized by the AARRR framework.

Acquisition Metrics

1. Customer Acquisition Cost (CAC)

Formula: Total acquisition spend ÷ New customers acquired

CAC tells you how efficiently you’re growing. Track it by channel, by cohort, and over time. A rising CAC means your channels are saturating. Read my complete guide on CAC optimization.

Benchmark: Varies wildly by industry. The key is LTV:CAC ratio ≥ 3:1.

2. Cost Per Lead (CPL)

Formula: Campaign spend ÷ Leads generated

CPL is your early indicator - before you know if leads convert to customers. Useful for performance marketing optimization.

Benchmark: B2B SaaS ₹1,000-₹5,000; D2C ₹100-₹500.

3. Traffic by Source

Formula: Sessions segmented by channel (organic, paid, direct, referral, social)

This tells you channel health. If 80% of traffic is paid, you’re one algorithm change from disaster. Build organic channels through SEO-driven content marketing.

4. Click-Through Rate (CTR)

Formula: Clicks ÷ Impressions × 100

CTR measures how compelling your messaging is. Low CTR = wrong audience or weak creative.

Benchmark: Search ads 3-5%; Display ads 0.5-1%; Email 2-5%.

Activation Metrics

5. Activation Rate

Formula: Users who completed key action ÷ Total signups × 100

The “key action” varies by product - for Slack it’s sending messages, for Canva it’s creating a design. Define yours and optimize relentlessly.

Benchmark: 20-40% for most SaaS products. Higher is better.

6. Time to First Value (TTFV)

Formula: Time between signup and completing the activation action

Shorter TTFV = higher activation rate = lower churn. At Jio, reducing TTFV in JioPC onboarding dramatically improved retention.

Benchmark: < 5 minutes for self-serve products.

7. Onboarding Completion Rate

Formula: Users who completed onboarding ÷ Users who started onboarding × 100

If your onboarding has multiple steps, track drop-off at each step. The biggest drop-off is your first optimization target.

Retention Metrics

8. Retention Rate (Day 1 / 7 / 30)

Formula: Users active on Day N ÷ Users who signed up on Day 0

The single most important metric for sustainable growth. Everything else is noise if users don’t come back. See my retention marketing playbook.

Benchmark: D1 > 40%, D7 > 25%, D30 > 15%.

9. Churn Rate

Formula: Customers lost in period ÷ Customers at start of period × 100

Monthly churn and annual churn tell different stories. 5% monthly churn = 46% annual churn. That’s brutal.

Benchmark: < 5% monthly for SaaS; < 8% for e-commerce.

10. Net Revenue Retention (NRR)

Formula: (Starting revenue + expansion - contraction - churn) ÷ Starting revenue × 100

NRR above 100% means you’re growing revenue from existing customers even without new acquisitions. The holy grail.

Benchmark: > 110% for B2B SaaS.

Revenue Metrics

11. Customer Lifetime Value (LTV)

Formula: Average revenue per customer × Average customer lifespan

LTV determines how much you can afford to spend on acquisition. Track it alongside CAC - the LTV:CAC ratio should be ≥ 3:1.

Benchmark: LTV:CAC ≥ 3:1; CAC payback period < 12 months.

12. Average Revenue Per User (ARPU)

Formula: Total revenue ÷ Total active users

ARPU tracks monetization efficiency. Rising ARPU with stable user count = healthy upsell/cross-sell motion.

13. Conversion Rate

Formula: Conversions ÷ Total visitors × 100

This is your CRO north star. Track macro conversions (purchase, signup) and micro conversions (add to cart, start trial).

Benchmark: E-commerce 2-3%; SaaS free trial 5-10%; Landing page 10-20%.

Referral Metrics

14. Viral Coefficient (K-Factor)

Formula: Invitations per user × Conversion rate of invitations

K > 1 means exponential growth (each user brings more than one new user). Even K = 0.3 meaningfully reduces your effective CAC.

15. Net Promoter Score (NPS)

Formula: % Promoters (9-10) - % Detractors (0-6)

NPS predicts organic growth. High NPS = users will recommend you. Low NPS = you’re losing the word-of-mouth channel.

Benchmark: > 50 is excellent; > 30 is good; < 0 is urgent.

Building Your Growth Dashboard

Tier 1: Check Daily

• CAC by channel
• Conversion rates (landing page, signup, purchase)
• Active users

Tier 2: Check Weekly

• Activation rate and TTFV
• Retention curves (D1/D7)
• CTR and CPL by campaign
• ARPU

Tier 3: Check Monthly

• LTV and LTV:CAC ratio
• NRR
• Monthly churn rate
• NPS
• Viral coefficient

Use the right tools to automate dashboards - manual tracking doesn’t scale.

How Metrics Connect to Strategy

If this metric is bad…	Focus on…
High CAC	Channel optimization, CRO, organic growth
Low activation rate	Onboarding redesign, TTFV reduction
Low retention	Retention marketing, product improvements
Low conversion rate	CRO experiments, messaging
Low LTV	Upsell strategy, engagement, retention
Low NPS	Product quality, support, expectation setting

The Metrics Trap to Avoid

The biggest mistake I see growth teams make: optimizing a metric without understanding its connection to revenue.

High signup rates mean nothing if those users never activate. Low CAC is meaningless if LTV is even lower. Always trace metrics back to business outcomes using data-driven decision frameworks.

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