Every DTC brand that scales profitably has five numbers dialed in. Every one that stalls, burns cash, or gives up equity too early has at least one of these numbers broken. The five metrics—CAC, AOV, contribution margin, LTV, and payback period—aren't just dashboard vanity. They're the engine that determines whether growth capital makes you money or buries you.
This guide covers each metric, the formula behind it, what "healthy" looks like, and how they connect to determine your funding eligibility.
Metric #1: Customer Acquisition Cost (CAC)
CAC is the total cost to acquire one new customer. Not a website visitor, not a lead—a paying customer who completes their first order.
The critical mistake most brands make is calculating blended CAC across all channels. A brand spending $8,000 on Meta and $4,000 on TikTok might report a $24 blended CAC—but Meta's actual CAC could be $18 while TikTok's is $40. You need to know channel-level CAC to make intelligent allocation decisions.
For a step-by-step breakdown of how to calculate this correctly, see our CAC payback calculator guide.
Metric #2: Average Order Value (AOV)
AOV is the average revenue per transaction. It's the top-line number that sets the ceiling on how much gross profit each order can generate.
AOV is the easiest metric to move. Bundles, upsells, free-shipping thresholds, and tiered pricing can increase AOV by 20–40% without increasing CAC. That's pure leverage: every dollar of AOV increase drops straight to the bottom line at your margin rate.
Metric #3: Contribution Margin
Contribution margin is what's left after you subtract every variable cost from the order revenue. Not just COGS—everything tied to fulfilling that specific order.
Here's why this matters: a brand might report 65% gross margin but only have 42% contribution margin after free shipping ($6/order), 3% payment processing, and a 12% return rate. The difference between 65% and 42% is the difference between a 14-day payback and a 40-day payback. Use contribution margin, not gross margin, for all payback calculations.
Metric #4: Lifetime Value (LTV)
LTV is the total gross profit a customer generates over their entire relationship with your brand. It's the number everyone loves to quote—and the one that's most often misleading.
The classic trap: "Our LTV is $400 and our CAC is $35, so we have an 11:1 ratio." That sounds incredible. But if that $400 takes 24 months to materialize and you need the cash in 30 days to fund the next ad cycle, LTV is a promise and cash flow is reality. A high LTV with a long payback period means you need massive working capital to bridge the gap.
Metric #5: Payback Period
Payback period ties everything together. It answers: how many days until a customer's cumulative contribution margin covers their CAC?
This is the metric that matters most for growth capital. A 15-day payback means you can reinvest the same dollar 24 times a year. A 90-day payback means 4 times. That's not a marginal difference—it's the difference between compounding growth and stagnation.
Worked example: a DTC skincare brand
Let's put all five metrics together for a hypothetical DTC skincare brand doing $45K/month in revenue:
- CAC: $28 (Meta ads, cohorted)
- AOV: $72 (first-order, after upsell)
- Contribution Margin: 48% ($72 − $18 COGS − $6 shipping − $2.39 processing − $4 avg returns cost = $41.61 ÷ $72)
- 12-Month LTV: $156 (avg 2.2 orders in year one at $72 AOV × 48% margin × 2.2 = $75.80... wait, let's be precise)
CAC: $28
First-order payback: $28 ÷ $34.56 = 0.81 orders
Payback period: ~8 days (single order fulfillment cycle)
That 2.7:1 LTV:CAC ratio isn't flashy compared to brands claiming 8:1 or 10:1. But with an 8-day payback, this brand can cycle capital rapidly and compound. The 10:1 brand with a 6-month payback is sitting on a promise—this brand is sitting on cash.
The health check: where do you stand?
Here's how to benchmark your unit economics. These ranges are based on hundreds of DTC brands we've analyzed through our qualification process:
| Metric | Healthy | Warning | Critical |
|---|---|---|---|
| CAC | < 1/3 of AOV | 1/3 to 2/3 of AOV | > 2/3 of AOV |
| AOV | > $50 | $30–$50 | < $30 |
| Contribution Margin | > 45% | 30–45% | < 30% |
| 12-Month LTV:CAC | > 3:1 | 2:1–3:1 | < 2:1 |
| Payback Period | < 30 days | 30–60 days | > 60 days |
You don't need all five in the green to be a great business. But if payback period and contribution margin are both in the red, growth capital won't fix your economics—it'll amplify the problem.
See how your numbers stack up
Enter your CAC, AOV, and margins to get your payback period and funding eligibility. → Try the CohortCredit Calculator
How unit economics determine funding eligibility
Traditional lenders look at revenue and credit scores. Revenue-based financing providers look at unit economics. The logic is straightforward: if your marketing spend generates profit faster than the repayment period, the advance pays for itself from the revenue it creates.
CohortCredit's model is built on this principle. We advance $1,000 in marketing capital. You repay $1,100 from the revenue that specific spend generates. If your payback period is under 30 days, the advance is covered before the month is out. No equity, no fixed payments, no personal guarantee.
For a deeper understanding of how this model works, read our guide on how revenue-based financing works for DTC brands. And if you want to understand why contribution margin—not gross margin—is the number that matters, our CAC payback calculator guide walks through the math step by step.
The brands that get funded fastest aren't the biggest or the most impressive on paper. They're the ones whose unit economics tell a clear story: we spend money on marketing, it comes back fast, and every cycle generates more profit than the last. Check if your brand qualifies.