Calculator
Customer Acquisition Cost Calculator
Most teams understate CAC because they only count ad spend. The real number is everything it takes to win a customer: salaries, commissions, tools, agencies, and programs, divided by the customers that spend actually produced. This calculator returns your blended CAC, your payback period, and your implied LTV:CAC ratio, then tells you whether the number is healthy or hiding a structural problem.
CAC is a system output. When pipeline creation is inconsistent, CAC swings with it. That is why the fix for a bad CAC is rarely spend less, and usually fix the machine that turns spend into customers.
Read the number
How to read your number
- CAC payback. Under 12 months is strong for SMB motions, under 18 for mid-market, under 24 for enterprise (Bessemer Venture Partners); the market median sits around 18 to 20 months.
- LTV:CAC. 3:1 is the long-standing floor (David Skok); the 2025 median is about 3.6:1 with top-quartile companies at 4:1 to 6:1 (Benchmarkit).
- Blended means everything. Counting only paid media is the most common way teams understate real CAC.
Method
The CAC method, step by step
Most CAC debates are really definition debates. Run the number the same way every quarter and the arguments stop.
Step 1. Pick the period. One quarter is the practical default. Annual smooths too much to steer with, monthly is too noisy.
Step 2. Add up everything spent to acquire. Sales and marketing salaries and commissions, the tools those teams run, agencies, paid media, events, and content programs. If the dollar exists to win new customers, it counts.
Step 3. Leave out what is not acquisition. Customer success, account management, and renewal costs are retention economics. They belong in gross margin, not CAC.
Step 4. Offset the cohort. This quarter's spend usually wins next quarter's customers. If your sales cycle runs 60 to 90 days, divide this quarter's new customers by last quarter's spend. Skipping the offset is how fast-growing teams accidentally report a flattering CAC and slowing teams report a brutal one.
Step 5. Divide. Total acquisition spend over new customers won. That is blended CAC, the number this calculator returns.
Example
A worked example
A $6M ARR software company runs the math on Q1. Fully loaded sales and marketing salaries and commissions come to $310,000. Paid media adds $95,000. Tools, agencies, and programs add $45,000. Total acquisition spend: $450,000.
The quarter closes 18 new customers at an average of $30,000 in annual contract value. Blended CAC: $450,000 divided by 18, or $25,000 per customer.
At 80 percent gross margin, each customer contributes $2,000 per month. Payback: 12.5 months. Healthy for mid-market. At a three year average customer life, lifetime value is $72,000 and LTV to CAC is 2.9 to 1, just under the 3 to 1 floor.
One number in this example is doing all the damage, and it is not the spend. Move new customers from 18 to 24 with the same $450,000 and CAC drops to $18,750, payback falls under 10 months, and LTV to CAC clears 3.8 to 1. That is why the fix for a bad CAC is rarely spend less. It is conversion, and conversion is a system property. If your CAC swings quarter to quarter, the machine that turns spend into customers is inconsistent. Run your own numbers above, then check whether the pipeline behind them holds enough coverage with the Pipeline Coverage Calculator, and what your team's selling hours really cost with the Administrative Drag Calculator.
FAQ
CAC questions, answered
How do I calculate blended CAC?
Divide all of your sales and marketing spend over a period by the new customers won in that period. Blended means everything: salaries, tools, agencies, and ad spend, not just paid media. Counting only ad spend is the most common way teams understate their real CAC.
What is a good CAC payback period?
Under 12 months is strong for SMB motions, under 18 for mid-market, and under 24 for enterprise (Bessemer Venture Partners). The market median sits around 18 to 20 months, so half of companies pay back slower than every target.
What is a healthy LTV to CAC ratio?
3:1 is the long-standing floor (David Skok, forEntrepreneurs), and the 2025 median is about 3.6:1 with top-quartile companies at 4:1 to 6:1 (Benchmarkit). Below 1:1 every sale loses money. Above 5:1 usually signals you are underinvesting in growth.
What costs should be included in CAC?
Include every dollar spent to win a customer: sales and marketing salaries and commission, the tools in that stack, agencies, and programs. Leave out customer success and account management, which are retention costs that belong in gross margin, not acquisition.
Where CAC fits
Where CAC fits
CAC measures acquisition efficiency. Pipeline Coverage measures whether there is enough pipe for the target. Administrative Drag measures the selling capacity you already paid for. Churn Cost measures what leaks out after you paid to acquire.
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