Blog / How to calculate CAC for an SMB (with examples)
How to calculate CAC for an SMB (with examples)
By DashViz Team · 2026-05-08
Reviewed by the DashViz editorial team for SMB operators.
Customer Acquisition Cost (CAC) is the total cost to acquire a new paying customer in a given period. The formula is total acquisition spend divided by new customers acquired. CAC paired with [LTV](/glossary/ltv) determines whether growth is profitable. This guide covers the formula, blended vs. paid CAC, three example calculations, and the most common SMB mistakes.
TL;DR
- •[CAC](/glossary/cac) = (Marketing spend + Sales spend) / New customers acquired.
- •Blended CAC includes all customers; paid CAC only includes paid-acquired ones.
- •Pair CAC with LTV. Healthy LTV/CAC ratio is 3:1 or higher.
- •Common mistake: not including salaries / fully-loaded costs of the sales team.
- •Track monthly. CAC changes as ad costs change and channels saturate.
Methodology note
Benchmarks and healthy ranges are directional planning ranges, not financial, accounting, tax, or legal advice. Use DashViz to compare them against your own source systems before making operational decisions.
The formula
CAC = (Marketing spend + Sales spend) / Number of new paying customers acquiredWhat goes in the numerator:
- Ad spend (Google, Facebook, LinkedIn).
- Marketing software (HubSpot, Mailchimp, etc.).
- Marketing salaries and contractors.
- Sales salaries and commissions.
- Tools used by sales (CRM, outreach tools).
Common omission that leads to underestimating CAC: forgetting to include the founder's time at SMB scale. If the founder spends 10 hours/week on marketing, that's a real cost even if it's not a paycheck line item.
Blended vs. paid CAC
Blended CAC. Total spend divided by all new customers (paid + organic + referral). Useful for unit economics overall.
Paid CAC. Total paid-channel spend divided by paid-channel-attributed customers. Useful for evaluating ad effectiveness specifically.
Most SMBs benefit from tracking both.
Three example calculations
Example 1: Bootstrapped SaaS
- Marketing spend (ads + tools): $5,000/month.
- Sales spend (just the founder, no salaried sales team): $0 direct, but the founder spends 15 hours/month on sales.
- New customers acquired: 20/month.
- CAC (excluding founder time) = $5,000 / 20 = $250.
If you value the founder's time at $100/hour, fully-loaded CAC is ($5,000 + $1,500) / 20 = $325.
Example 2: E-commerce DTC brand
- Ad spend: $20,000/month.
- Other marketing: $2,000/month.
- New customers acquired: 1,000/month (mix of paid and organic).
- Paid-attributed customers: 700/month.
- Blended CAC = $22,000 / 1,000 = $22.
- Paid CAC = $20,000 / 700 = $28.57.
Example 3: Professional services
- Marketing (referral programs, content): $3,000/month.
- Sales (1 full-time salesperson at $8K/month fully-loaded): $8,000/month.
- New customers acquired: 5/month.
- CAC = $11,000 / 5 = $2,200.
Using CAC with LTV
CAC alone is meaningless. Pair it with LTV.
- LTV/CAC ratio of 3:1 or higher → growth is profitable.
- Below 3:1 → reconsider channels or pricing.
- Above 5:1 → may be under-investing in growth.
Common mistakes
- Forgetting fully-loaded costs. Salaries, benefits, software — all of it counts.
- Tracking only paid CAC and ignoring blended. Both matter.
- Calculating once and never updating. CAC changes month-over-month as ad costs change.
- Not segmenting by channel. Blended CAC hides which channels are working and which are dragging the average up.
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