SaaS
Customer Acquisition Cost Calculator
Calculate the average sales and marketing cost required to acquire one new customer.
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SaaS Unit Economics Calculators
Connect acquisition cost, lifetime gross profit, payback, retention, and expansion by customer cohort.
Reviewed 2026-06-18 · CalcPilot Editorial Team
Decision brief
How these metrics work together
SaaS unit economics ask whether the gross profit from a customer cohort justifies the cost and cash required to acquire it. The useful comparison is cohort against cohort, using consistent cost, margin, and retention definitions.
Interactive tools
Calculators in this decision system
Ecommerce
Customer Lifetime Value Calculator
Estimate customer lifetime revenue from order value, purchase frequency, and lifespan.
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LTV to CAC Ratio Calculator
Compare customer lifetime value with customer acquisition cost.
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SaaS CAC Payback Calculator
Estimate how many months of gross profit are needed to recover customer acquisition cost.
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Net Revenue Retention Calculator
Calculate recurring revenue retained after expansion, contraction, and churn.
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SaaS Churn Rate Calculator
Calculate the percentage of starting SaaS customers lost during a period.
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Burn Multiple Calculator
Calculate cash burned for each dollar of net new annual recurring revenue.
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Cash Runway Calculator
Estimate how many months current cash can fund a constant monthly net burn.
Calculate nowBuild a fully labeled CAC
Blended CAC can include sales and marketing payroll, media, agencies, commissions, content, events, tools, and allocated overhead. Paid CAC may include only direct spend. Both are usable when the scope is explicit and stable.
Match costs to the customers they influenced. For a long sales cycle, same-month spend divided by same-month customers can create a false trend; use cohorts, lag assumptions, or a trailing window.
Use gross profit, not lifetime revenue
Customer lifetime value should reflect gross or contribution profit, retention behavior, and expansion—not only revenue. Small changes in churn assumptions can create implausibly large lifetime estimates.
Segment by plan, market, channel, and cohort. A blended LTV:CAC ratio can hide an unprofitable acquisition channel behind a mature, high-retention customer base.
Add the cash dimension
Payback period estimates how many months of gross profit recover acquisition cost. It highlights liquidity risk that a lifetime ratio can hide, especially when growth is fast and acquisition is paid upfront.
Review payback with NRR, gross margin, burn, and customer concentration. A favorable model deserves increased investment only when the operational cohort evidence supports the assumptions.
Deep dives
Editorial guides for this topic
Customer Acquisition Cost: A Practical CAC Measurement Guide
Build a consistent CAC calculation, understand blended and channel CAC, and connect acquisition cost to lifetime value and payback.
Read the guide →SaaS Metrics Guide: MRR, ARR, Churn, NRR, and Rule of 40
Understand the core SaaS metrics, how they connect, and the definition choices that make recurring-revenue reporting reliable.
Read the guide →Common questions
Frequently asked questions
What costs should SaaS CAC include?
A fully loaded CAC can include media, sales and marketing payroll, commissions, agencies, content, events, tools, and allocated overhead. Label narrower versions clearly.
Should LTV use revenue or gross profit?
Gross-margin-adjusted value is more useful for economic decisions because revenue does not account for the cost of serving the customer.
Why does CAC payback matter when LTV:CAC is strong?
The lifetime ratio does not show timing. Long payback can create severe cash requirements and exposes the business to churn before acquisition cost is recovered.
What is a good LTV:CAC ratio?
There is no universal threshold. Stage, margin, growth rate, payback, retention quality, capital cost, and calculation assumptions all matter.
Editorial scope: This page connects related formulas; it does not replace professional financial, tax, legal, or accounting advice. Review our calculation methodology and editorial standards.