E-Commerce KPIs beyond ROAS and CAC
In the world of e-commerce selling, tracking the right KPIs can make all the difference in scaling your business and improving profitability. But with so many metrics available, it’s important to focus on the ones that provide actionable insights. For Amazon sellers, Shopify sellers, and other e-commerce entrepreneurs, we’ll break down six essential KPIs that matter most—and how to improve them.
“You can’t manage what you can’t measure”
– Peter Drucker (Management Consultant, Educator, and Author)
1. Return on Ad Spend (ROAS)
ROAS measures how much revenue you generate for every dollar spent on ads. It’s one of the top ways to gauge ad campaign efficiency.
How to measure it:
ROAS = Total Revenue from Ads / Total Ad Spend
For instance, if you spent $500 on ads and made $2,500 in revenue, your ROAS would be 5x. A higher ROAS means better performance.
How to improve it:
- Test different ads: A/B testing ad copy, visuals, and calls-to-action can help improve results.
- Optimize audience targeting: Target customers more likely to convert based on their demographics and shopping behaviors.
- Refocus ad spend: Direct more of your budget toward platforms and campaigns with the best ROAS.
2. Customer Acquisition Cost (CAC)
CAC tells you how much it costs to acquire a new customer, including all marketing and sales expenses. Reducing CAC means you’re growing more efficiently.
How to measure it:
CAC = Total Marketing Costs / Count of New Customers
How to improve it:
- Maximize organic marketing: Focus on SEO, content marketing, and social media to acquire customers without heavy ad spend.
- Improve website conversion rates: Ensure your site is user-friendly, fast, and easy to navigate with clear calls-to-action.
- Use retargeting ads: Retarget visitors who showed interest but didn’t convert initially—this typically leads to lower CAC.
3. Return Rate
Return rate measures the percentage of products sent back by customers. High return rates not only cost money but can harm Amazon seller ratings and customer relationships.
How to measure it:
Return Rate = (Number of Returned Items / Total Items Sold) x 100
For example, if you sold 1,000 items and 50 were returned, your return rate is 5%.
How to improve it:
- Accurate product descriptions: Ensure your product listings are clear and detailed to avoid misleading customers.
- High-quality product images: Include multiple angles and zoom options so customers know exactly what they’re buying.
- Offer customer support: Provide detailed sizing charts, FAQs, and responsive service to help customers make informed decisions.
4. Customer Retention Rate
Customer Retention Rate (CRR) measures the rate of returning customers. It’s more cost-effective to retain a customer than acquire a new one due to CAC.
How to measure it:
CRR = [(Customers at End of Period – New Customers) / Customers at Start of Period] x 100
If you started with 200 customers, gained 50 new ones, and ended with 220, your CRR would be 85%.
How to improve it:
- Introduce loyalty programs: Encourage repeat business by offering points, discounts, or exclusive perks.
- Newsletters: Send newsletters to your existing customers to leverage on brand recall.
- Optimize post-purchase experience like easy returns and responsive customer service.
5. Customer Lifetime Value (LTV)
LTV predicts the total revenue a customer will bring in over their lifetime. It’s a powerful metric for understanding the long-term value of your customers.
How to measure it:
CLTV = Average Order Value x Purchase Frequency x Customer Lifespan
If your average customer spends $50 per order, makes 3 purchases per year, and stays loyal for 2 years, their CLTV would be $300.
How to improve it:
- Upsell and cross-sell: Offer complementary products or premium options to boost order value.
- Deliver great customer experiences like fast shipping, helpful support, and personalized recommendations to keep customers coming back.
- Re-engage with email marketing: Keep customers in the loop with personalized promotions based on their purchase history.
6. Average Order Value (AOV)
AOV tracks how much a customer spends on average per order. Increasing AOV directly boosts revenue without needing to acquire more customers.
How to measure it:
AOV = Total Revenue / Number of Orders
For example, if your store earned $10,000 from 500 orders, your AOV is $20.
How to improve it:
- Offer bundles or sets: Create product bundles or “buy more, save more” deals to increase the total cart value.
- Implement free shipping thresholds: Encourage larger purchases by offering free shipping for orders over a certain amount.
- Use limited-time offers: Create urgency with short-term discounts or promotions that nudge customers to add more to their cart.
While you focus on managing your business, Outpost shall calculate these KPIs for you (in an automated way) to let you manage your business decisions on the basis of these KPIs.


