CAC Payback Period Calculator
How long until each customer pays for themselves? Calculate payback including expansion revenue.
Total cost to acquire one customer
Monthly revenue per customer
Revenue after direct costs (typically 70-90% for SaaS)
Additional revenue from upsells per year
Ongoing support costs per customer
What is a good CAC payback period?
A healthy CAC payback period is 12 months or less. Top-performing SaaS companies achieve 6-9 months. Payback periods over 18 months indicate unsustainable growth. The fastest payback periods (3-6 months) typically come from product-led growth and viral loops. A shorter payback period means more capital efficient growth and faster ability to invest in expansion.
Does payback period include gross margin?
Yes, the most accurate payback calculation uses Contribution Margin (revenue minus COGS) rather than full revenue. If your gross margin is 80%, using full revenue makes payback appear 20% longer than reality. Always calculate payback on the actual profit from each customer after direct costs.
How does expansion revenue affect payback?
Expansion revenue (upsells, seat additions) significantly shortens payback periods. Including expansion, payback can drop 20-40% faster. If your payback is 12 months but you have 20% annual expansion, the effective payback is ~10 months. This is why expansion revenue is critical for growth efficiency.
Why is payback period important for fundraising?
Investors use payback period to assess capital efficiency. A 6-month payback means $1 invested generates profit in 6 months, then compounds. An 18-month payback means capital is tied up for 1.5 years before profitability. VCs prefer payback under 12 months for Series A+ companies. It also shows product-market fit - customers who cant payback quickly may not truly value your product.