What are good unit economics for startups?

For a SaaS startup, good unit economics means an LTV:CAC ratio of 3:1 or higher, CAC payback under 12 months for SMB customers (under 18 for mid-market, under 24 for enterprise), and gross margin of 70% to 85%. Early-stage companies can run 12 to 18 months of payback while channels are still being tested, but should show a path toward the benchmarks before scaling spend.

How do you calculate unit economics for a SaaS business?

Calculate four numbers. CAC is sales and marketing spend divided by new customers. LTV is monthly revenue per account times gross margin, divided by monthly churn. LTV:CAC divides the two, targeting 3:1 or better. CAC payback is CAC divided by monthly revenue per account times gross margin, targeting under 12 months for SMB. Example: $2,000 CAC and a $200 per month plan at 80% margin gives a payback of 12.5 months.

What are SaaS unit economics?

SaaS unit economics measure the profitability of each customer. The key metrics are Customer Acquisition Cost (CAC), Lifetime Value (LTV), LTV:CAC ratio, and payback period. Healthy SaaS businesses target an LTV:CAC ratio of 3:1 or higher.

How do you calculate CAC?

Customer Acquisition Cost (CAC) is calculated by dividing total sales and marketing spend by the number of new customers acquired in that period. For example, $100K spend ÷ 50 new customers = $2,000 CAC.

What is a good LTV:CAC ratio?

A healthy LTV:CAC ratio is 3:1 or higher, meaning each customer generates 3x more value than it costs to acquire them. Below 1:1 means you lose money on every customer. Above 5:1 may indicate underinvestment in growth.

How do you calculate customer LTV for a SaaS startup?

The basic SaaS LTV formula is: Average Revenue Per Account (ARPA) × Gross Margin ÷ Churn Rate. For a $200/mo plan with 80% gross margin and 2% monthly churn: ($200 × 0.80) ÷ 0.02 = $8,000 LTV. Always use gross margin, not revenue alone, because gross profit is what funds acquisition and expansion.

What is CAC payback period?

CAC payback period is how many months of gross margin a customer must generate to repay their acquisition cost, calculated as CAC ÷ (ARPA × Gross Margin). Benchmarks depend on who you sell to: under 12 months for SMB, under 18 for mid-market, and under 24 for enterprise. Over 24 months is hard to defend outside enterprise.

How are unit economics different for product-led growth (PLG) vs sales-led startups?

PLG businesses typically have lower CAC (self-serve signup) but lower initial ACV; sales-led businesses have higher CAC but larger initial deals and faster expansion. Compare them on LTV:CAC ratio and payback period; both should clear 3:1 and a 12-month payback respectively, regardless of motion.

Should I include free-trial users in CAC calculations?

Only count converted, paying customers in the denominator. Free trials, freemium accounts, and waitlist signups inflate the customer count and understate true CAC. For a more conservative view, calculate paid CAC using only sales and marketing spend that targeted paid acquisition (excluding brand and PR).

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Unit Economics Calculator

Unit economics for startups in one place: know your CAC, LTV, and payback period, the metrics that determine if your SaaS business scales.

SaaS unit economics benchmarks at a glance

A healthy SaaS LTV:CAC ratio is 3:1 or higher. Below 1:1 you lose money on every customer, and above 5:1 usually means you are underinvesting in growth.
Target CAC payback is under 12 months when selling to small businesses, under 18 months for mid-market, and under 24 months for enterprise (Bessemer's long-standing benchmarks). At Series A, under 12 months is the clean story and 12 to 18 months is workable with net revenue retention above 110%.
SaaS gross margin is expected to land between 70% and 85%. Below 60% investors question whether it is a software business, and AI-native products with heavy inference costs often run 50% to 70%.
LTV equals monthly revenue per account times gross margin, divided by monthly churn: a $200 per month plan at 80% gross margin and 2% churn has an LTV of $8,000.

Payback by stage, seed to Series C, is in our CAC payback benchmarks report.

Unit Economics Calculator

Adjust inputs to analyze your customer acquisition economics

S&M Spend ($/mo)New Customers / MoARPU ($/mo)

Monthly Churn (%)Gross Margin (%)

CAC vs LTV

Customer acquisition cost compared to lifetime value

LTV:CAC Ratio

Target is 3x or higher for sustainable growth

10.0x

LTV:CAC Ratio

<1x Critical1-3x Caution>3x Healthy

Healthy

Payback Period

Months to recoup customer acquisition cost

3.3 months

0 mo12 mo18 mo24 mo

<12mo Good12-18mo Fair>18mo Poor

Unit Economics Summary

Key metrics at a glance

CAC (Cost to Acquire)
$500
LTV (Lifetime Value)
$5,000
LTV:CAC Ratio
10.0x
Payback Period
3.3 months
Monthly ARPU
$200

CAC

$500

LTV

$5,000

LTV:CAC

10.0x

Payback

3.3 mo

This is a preview. Want CAC, LTV, and payback tracked on your actual data, reviewed by your team?

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Frequently Asked Questions

What are good unit economics for startups?: For a SaaS startup, good unit economics means an LTV:CAC ratio of 3:1 or higher, CAC payback under 12 months for SMB customers (under 18 for mid-market, under 24 for enterprise), and gross margin of 70% to 85%. Early-stage companies can run 12 to 18 months of payback while channels are still being tested, but should show a path toward the benchmarks before scaling spend.
How do you calculate unit economics for a SaaS business?: Calculate four numbers. CAC is sales and marketing spend divided by new customers. LTV is monthly revenue per account times gross margin, divided by monthly churn. LTV:CAC divides the two, targeting 3:1 or better. CAC payback is CAC divided by monthly revenue per account times gross margin, targeting under 12 months for SMB. Example: $2,000 CAC and a $200 per month plan at 80% margin gives a payback of 12.5 months.
What are SaaS unit economics?: SaaS unit economics measure the profitability of each customer. The key metrics are Customer Acquisition Cost (CAC), Lifetime Value (LTV), LTV:CAC ratio, and payback period. Healthy SaaS businesses target an LTV:CAC ratio of 3:1 or higher.
How do you calculate CAC?: Customer Acquisition Cost (CAC) is calculated by dividing total sales and marketing spend by the number of new customers acquired in that period. For example, $100K spend ÷ 50 new customers = $2,000 CAC.
What is a good LTV:CAC ratio?: A healthy LTV:CAC ratio is 3:1 or higher, meaning each customer generates 3x more value than it costs to acquire them. Below 1:1 means you lose money on every customer. Above 5:1 may indicate underinvestment in growth.
How do you calculate customer LTV for a SaaS startup?: The basic SaaS LTV formula is: Average Revenue Per Account (ARPA) × Gross Margin ÷ Churn Rate. For a $200/mo plan with 80% gross margin and 2% monthly churn: ($200 × 0.80) ÷ 0.02 = $8,000 LTV. Always use gross margin, not revenue alone, because gross profit is what funds acquisition and expansion.
What is CAC payback period?: CAC payback period is how many months of gross margin a customer must generate to repay their acquisition cost, calculated as CAC ÷ (ARPA × Gross Margin). Benchmarks depend on who you sell to: under 12 months for SMB, under 18 for mid-market, and under 24 for enterprise. Over 24 months is hard to defend outside enterprise.
How are unit economics different for product-led growth (PLG) vs sales-led startups?: PLG businesses typically have lower CAC (self-serve signup) but lower initial ACV; sales-led businesses have higher CAC but larger initial deals and faster expansion. Compare them on LTV:CAC ratio and payback period; both should clear 3:1 and a 12-month payback respectively, regardless of motion.
Should I include free-trial users in CAC calculations?: Only count converted, paying customers in the denominator. Free trials, freemium accounts, and waitlist signups inflate the customer count and understate true CAC. For a more conservative view, calculate paid CAC using only sales and marketing spend that targeted paid acquisition (excluding brand and PR).

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