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Everything you need to know about D2C marketing metrics.
ROAS (Return on Ad Spend) measures how much revenue you earn for every dollar spent on advertising. Formula: ROAS = Revenue ÷ Ad Spend. A ROAS of 4x means you earn $4 for every $1 spent. Good ROAS varies by industry but 3–5x is typically considered healthy for D2C brands. Remember: ROAS doesn't account for all business costs — use MER for a holistic view.
CAC (Customer Acquisition Cost) is the total cost to acquire one new customer. Formula: CAC = Total Marketing & Sales Spend ÷ Number of New Customers. Keeping CAC low relative to LTV is critical for profitable growth. A healthy LTV:CAC ratio is 3:1 or higher.
LTV (Lifetime Value) is the total revenue a customer generates over their entire relationship with your brand. Formula: LTV = AOV × Purchase Frequency × Customer Lifespan. A healthy LTV:CAC ratio is 3:1 or higher. Increasing LTV through retention and upsells is one of the highest-leverage levers in D2C.
MER (Marketing Efficiency Ratio) measures total revenue divided by total marketing spend across all channels. Formula: MER = Total Revenue ÷ Total Marketing Spend. MER gives a blended view of marketing performance, unlike channel-specific ROAS. Many experienced D2C operators track MER as their north-star efficiency metric.
Breakeven ROAS is the minimum ROAS needed to cover your costs and avoid losing money on ads. Formula: Breakeven ROAS = 1 ÷ Gross Margin. If your gross margin is 50%, your breakeven ROAS is 2x. Any ROAS above this is profitable at the gross level. This metric helps set minimum ROAS targets in your ad platforms.
A 3:1 LTV:CAC ratio is the widely accepted benchmark for sustainable D2C growth. Below 1:1 means you're losing money per customer. 1–3:1 is marginal. Above 3:1 indicates strong unit economics. Above 5:1 may suggest you're underinvesting in acquisition.