Free tool

Marketing ROI & Sponsorship CAC:LTV Calculator

See whether newsletter ads and sponsorships earn back what they cost — and how long that takes.

What each customer from sponsorships costs, what they are worth, and whether the placements are worth buying again.

Sponsorship / ad spend
Customers attributed
Monthly revenue per account
Gross margin
Monthly churn

Calculate sponsorship LTV:CAC

Example

Sponsorship / ad spend $2,500 · Customers attributed 5

3.2 : 1

LTV to CAC ratio

Signal Healthy

How it works

1
Enter your numbers

Fill in sponsorship / ad spend, customers attributed, monthly revenue per account, gross margin and monthly churn. Change a number and the answer updates.
2
Press calculate sponsorship ltv:cac

One button. Change any input afterwards and the answer updates as you type.
3
Read the result

You get ltv to cac ratio, plus sponsorship cac, lifetime value, cac payback.

How sponsorship CAC is calculated

Sponsorship CAC is what you paid for the placements divided by the customers those placements produced. Spend $2,500 on newsletter ads and attribute five paying customers, and your sponsorship CAC is $500.

The hard part is the denominator. Use customers you can defend with UTMs, unique codes, or “how did you hear about us” — not every signup that week. Inflating attributed customers makes every sponsorship look better than it is.

Pair CAC with lifetime value

CAC alone cannot tell you whether to buy the placement again. Lifetime value is monthly revenue per account times gross margin, divided by monthly churn. At $100 a month, 80% margin and 5% churn, LTV is $1,600.

Divide LTV by sponsorship CAC. $1,600 against a $500 CAC is 3.2:1 — the same 3:1 floor founders use for paid channels generally. Below 1:1 the sponsorship loses money on every customer it brings.

Payback matters as much as the ratio

A strong ratio with a 24-month payback still burns cash while you wait. Payback is sponsorship CAC divided by monthly gross margin per customer. Under 12 months is comfortable for SMB products; beyond 18 months you are financing growth with placements that take a long time to return.

When to scale the same inventory

Above about 5:1 with honest attribution, you can usually buy more of the same slots before diminishing returns show up. Between 3:1 and 5:1, keep buying and watch CAC as you increase volume. Under 3:1, fix creative, landing page or audience fit before you renew.

What this does not do

Only as good as your attribution. Counting every signup in the sponsorship month flatters the channel; count customers you can honestly tie to the placements.
Assumes constant churn and no expansion. Real cohorts churn hardest early and some accounts grow, so treat the ratio as a planning number, not a forecast.
A healthy ratio on one placement does not mean every inventory slot will match it. Price, audience fit and creative all move CAC.

Frequently asked questions

How do you calculate CAC from newsletter sponsorships?

Divide what you paid for the placements by the number of paying customers those placements produced. $2,500 of sponsorship spend that attributed five customers is a $500 CAC.

What is a good LTV to CAC ratio for ad sponsorships?

Three to one or better is the usual bar, same as paid ads generally. Below 1:1 the placements lose money. Above 5:1 often means you can profitably buy more of the same inventory.

Should I count every signup after a sponsorship as attributed?

No. Count customers you can tie to the placement with UTMs, codes or surveys. Counting the whole month flatters the channel and will make renewals look safer than they are.

How is this different from a normal LTV:CAC calculator?

It derives CAC from sponsorship spend and attributed customers instead of asking for a blended CAC. LTV and payback use the same gross-margin maths as the SaaS LTV:CAC tool.

Is this sponsorship CAC:LTV calculator free?

Yes. It is free.