Google Ads ROI Calculator for SaaS
See what a Google Ads budget could realistically return for a SaaS business: customers, CAC, LTV:CAC, payback, and why revenue lags spend. The defaults are placeholders, so replace them with your own numbers.
Inputs
Results
First 90 days
Each customer returns about 6.4x what it costs to win and pays back in 7.5 months, which is in the range many SaaS teams treat as healthy.
How to use this tool
- 1
Enter your monthly Google Ads budget and any other monthly costs of running the program, such as agency fees, tools or sales time.
- 2
Enter your cost per lead and your conversion rates from lead to opportunity and from opportunity to closed-won.
- 3
Enter your annual contract value, gross margin, expected customer lifetime and sales cycle length.
- 4
Read your CAC, LTV:CAC, payback period and what the first 90 days are likely to look like.
Use cases
Sizing a Google Ads budget
See how many leads, opportunities and customers a budget should produce before you commit to it.
Checking whether paid search can pay back
Compare your payback period with how much cash runway you can afford to tie up while deals close.
Setting realistic first quarter expectations
Show your team or board why a long sales cycle means pipeline arrives well before closed revenue.
Finding the weak link in the funnel
Change one input at a time to see whether cost per lead, conversion rates or deal size moves your CAC the most.
Frequently asked questions
How do you calculate Google Ads ROI for a SaaS business?+
Start from your budget and cost per lead to get leads, then apply your conversion rates to get customers. Divide your total acquisition cost by customers to get CAC, and compare it with the gross profit a customer brings in over their lifetime.
What is a good LTV:CAC ratio for SaaS?+
Many teams use 3x as a minimum rule of thumb. Your own margins, churn and cash position matter more than any single benchmark, so treat 3x as a starting point rather than a guarantee.
What is CAC payback and why does it matter for Google Ads?+
CAC payback is the number of months of gross profit it takes to earn back what you spent winning a customer. It matters because ad spend leaves your account before revenue arrives, especially when sales cycles are long.
Why does the calculator show little or no closed revenue in the first 90 days?+
Deals take time to close. If your sales cycle is three months or longer, leads you generate this quarter will mostly close next quarter, so the first 90 days show pipeline and spend before they show revenue.
What cost per lead should I use?+
Use your own recent Google Ads data. The default here is only a placeholder. If you have no history, run a small test campaign before planning a large budget.
What does this calculator leave out?+
It does not model churn timing, expansion revenue, discounts, organic or brand lift from ads, or the ramp-up period of a new campaign. Use it as a planning estimate, not a forecast.