How to read your results
The verdict is your margin-adjusted LTV:CAC ratio translated into plain English. Under 1:1 means every acquisition loses money — scaling makes it worse, not better. 1–3 works but has no cushion. 3–5 is the healthy zone. Above 5 usually means you could profitably spend more than you are.
Your ceilings are the calculator run backwards: given what a customer is worth to you and the ratio you're targeting, the maximum you can afford to pay at each funnel stage. These are the numbers to take into your bidding — if your target CPA in the ad platform is above your max CAC here, the platform is optimizing you toward losses.
Your biggest lever compares realistic improvements — a few points of conversion, modestly cheaper media, a pricing bump — by their actual effect on your economics. The ranking changes with your numbers: teams with weak close rates should fix sales before touching ad budgets; teams with strong funnels should push spend. That's the whole argument for calculating instead of guessing.
Every term on this page, defined
ROAS — return on ad spend
Revenue attributed to ads ÷ ad spend. A 4x ROAS means $4 of revenue per $1 of spend. Flattering by design: it ignores your margin and everything you pay beyond media.
Breakeven ROAS
1 ÷ gross margin — the ROAS at which you made nothing. At 40% margin, breakeven is 2.5x; a "3x ROAS" is a thin win, not a triumph. Every ROAS target should be set relative to this number.
CPC — cost per click
Ad spend ÷ clicks. The price of attention, not of results — useful mainly as the top of the chain and as a max-bid ceiling.
CPL — cost per lead
Ad spend ÷ leads. A lead is any hand raised: form fill, chat, call. CPL can look great while the business loses money — leads aren't revenue.
CPA — cost per action/acquisition
Ad spend ÷ whatever action you defined — a purchase, a signup, a form. The catch-all term ad platforms use; always ask "per what, exactly?"
Cost per booked call
Ad spend ÷ sales conversations that actually happened. For service businesses, the most honest mid-funnel metric — it's where lead quality reveals itself.
Cost per order
The ecommerce equivalent of CAC: ad spend ÷ orders. Pair it with AOV and margin, or it means nothing.
CAC — customer acquisition cost
Total acquisition spend ÷ new customers. Media-only CAC counts just the ad platforms; fully-loaded CAC adds management fees and tooling — the number your P&L actually feels, and the one this calculator judges you on.
AOV — average order value
Revenue ÷ orders. In this calculator, ecommerce's "revenue per customer." If customers repeat, either model recurring revenue or use lifetime revenue instead of first-order AOV.
Conversion rate
The percentage that advances at each funnel step — click→lead, lead→call, call→customer, or click→purchase for ecommerce. Small changes here beat large budget changes surprisingly often; that's what the lever section measures.
Gross margin
The percentage of revenue left after delivering the product or service — before overhead. Every revenue figure in ad math should be multiplied by it, and almost none are.
LTV — customer lifetime value
Total revenue a customer generates over the relationship. For recurring revenue: monthly value × months retained. This calculator uses margin-adjusted LTV (LTV × gross margin) — the honest version, since you can't pay for ads with revenue you spent delivering.
LTV:CAC ratio
Margin-adjusted lifetime value ÷ fully-loaded acquisition cost. The single number that says whether your growth machine creates or destroys value. The standard bar is 3:1.
CAC payback
How many months of a customer's margin it takes to earn back their acquisition cost. The cash-flow lens: a great LTV:CAC with a 30-month payback can still starve you.
Churn & retention
Churn is the share of customers who leave each month; retention is its mirror. Average lifetime in months ≈ 1 ÷ monthly churn — 4% monthly churn means roughly 24 months.
What is a good LTV:CAC ratio?
The standard bar is 3:1 — margin-adjusted lifetime value at least three times acquisition cost. Below 1:1 you pay for the privilege of acquiring customers. Between 1 and 3 the machine works but has no margin for error — one bad month of close rates and you're underwater. Above 5, counterintuitively, you may be underspending: economics that strong usually mean growth is available for the buying.
What ROAS do you actually need?
Your breakeven ROAS is 1 ÷ gross margin. At 50% margin, 2.0x ROAS means you broke even on media — before paying whoever manages the ads. This is the trap in platform dashboards: they report revenue ROAS, celebrate a 3x, and never mention that at your margin the real number needed was 2.5x. Margin math decides; revenue math flatters.
CPL, CPA, CAC, ROAS — untangled
CPL prices a hand raised. Cost per booked call prices a real conversation — the metric most service businesses should manage to, because it's where lead quality shows. For ecommerce the equivalent is cost per order. CAC prices an actual customer, and the fully-loaded version (media + management + tooling) is the only honest one. ROAS compares revenue to spend — useful, flattering, and meaningless without margin. The funnel leaks between every step, which is why a lovely CPL can coexist with a fatal CAC. Calculate all the way through, every time — and then wire your CRM so the calculation runs itself.