SaaS Business ROI Calculator

CAC:LTV (Customer Acquisition Cost to Lifetime Value ratio) measures how much value you extract from each customer relative to acquisition cost. A ratio of 3:1 or higher is excellent, meaning you earn $3 for every $1 spent acquiring customers.

For early-stage SaaS: 10-20% monthly is strong. For growth-stage: 5-10% monthly is healthy. For mature SaaS: 2-5% monthly is sustainable. Consistent growth matters more than absolute numbers.

Focus on customer success, onboarding, product-market fit, pricing alignment, regular engagement, and proactive support. Even a 1% churn reduction dramatically improves LTV and unit economics.

Magic Number measures sales efficiency: Net New ARR / Sales & Marketing Spend. Above 0.75 is good, above 1.0 is excellent. It shows how efficiently you convert marketing spend into recurring revenue.

For SaaS: < 12 months is excellent, 12-18 months is good, 18-24 months is acceptable. Shorter payback means faster cash recovery and lower capital requirements for growth.

LTV = Average Revenue Per Customer × Customer Lifespan. Or: LTV = ARPU / Churn Rate. It represents the total revenue a customer generates before churning.

Aim for 70-85%. High gross margins are critical for SaaS profitability because they fund sales, marketing, R&D, and operations while maintaining healthy unit economics.

Conservative shows downside risk, Realistic projects expected performance, Aggressive shows upside potential. Use all three for fundraising, planning, and risk management.