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Both calculators run independently — change the inputs on either side to compare results.

Customer Acquisition Cost (CAC) Calculator

Calculate how much it costs to acquire one new customer by dividing total sales and marketing spend by new customers gained. The denominator of the all-important CLV:CAC ratio.

Total Marketing Spend ($)

Sales Expenses ($)

New Customers Acquired (customers)

Fill in the required fields to see your result.

Business

Rule of 40 Calculator

Check whether a SaaS company's growth rate plus profit margin clears the 40% benchmark that signals a healthy balance of growth and profitability.

Revenue Growth Rate (%)

Profit Margin (%)

Fill in the required fields to see your result.

Key differences

	Customer Acquisition Cost (CAC) Calculator	Rule of 40 Calculator
Category	Business	Business
Inputs required	3	2
Result	Customer Acquisition Cost ($)	Rule of 40 Score (%)
What it does	Calculate how much it costs to acquire one new customer by dividing total sales and marketing spend by new customers gained. The denominator of the all-important CLV:CAC ratio.	Check whether a SaaS company's growth rate plus profit margin clears the 40% benchmark that signals a healthy balance of growth and profitability.