What's a Good LTV:CAC Ratio? (And How to Actually Improve It)

LTV:CAC is the metric investors use to decide whether your growth is a business or a bonfire. The headline rule of thumb is 3:1 — but the ratio alone can hide a startup that is quietly starving for cash.

The formula

ARPU is average revenue per customer per month. For a transactional or D2C business, use average order value × orders per month. Gross margin is what is left after the direct cost of delivering the product. Churn is the share of customers you lose each month.

What counts as healthy

• •Below 1:1 — you lose money on every customer. Fix this before scaling spend.
• •1:1 to 3:1 — workable, but margin for error is thin.
• •3:1 and above — the zone investors want to see.
• •Above 5:1 — often a sign you are *under*-investing in growth, not a flex.

Why payback matters just as much

A 4:1 ratio with a 20-month CAC payback can still kill a cash-tight startup, because you are fronting acquisition cost long before you earn it back. Investors want 3:1 *and* payback under 12 months.

Plug in your numbers with the free LTV:CAC calculator to see your ratio, payback and customer lifetime instantly.

The real levers to improve it

1. 1.Cut churn. It compounds — a drop from 5% to 3% monthly churn nearly doubles lifetime value.
2. 2.Raise gross margin. Renegotiate COGS, cloud, fulfilment, or move customers to higher-margin plans.
3. 3.Lower CAC. Shift spend to channels that convert; lean on referrals and content over paid.
4. 4.Increase ARPU. Upsell, cross-sell, or raise prices — usually the fastest lever founders under-use.

For non-subscription businesses, the equivalent of churn is repeat-purchase rate — and it is the metric that decides D2C economics. Runway computes LTV:CAC and repeat rate from your real Razorpay/Stripe data so you are not guessing.