SaaS Metrics Calculator
Enter your customer base, revenue, churn, and CAC to see MRR, ARR, ARPU, LTV, LTV:CAC ratio, payback period, and Rule of 40 in one click.
Total active paying customers at the start of this month.
Total subscription revenue this month, normalized for any annual plans (divide annual by 12).
Percentage of customers (or revenue) lost per month. B2B SaaS averages 2-3%; B2C is higher.
Average fully-loaded cost (sales + marketing) to acquire one paying customer.
Revenue minus cost of goods sold (hosting, support, payment processing), as %. SaaS averages 70-85%.
Your year-over-year revenue growth rate. Enter 0 if you want to skip Rule of 40.
Operating profit margin. Negative is normal for early-stage growth SaaS.
💰 Annual Recurring Revenue (ARR)
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— MRR · — LTV:CAC
MRR
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monthly recurring
ARPU
—
avg revenue / user
LTV
—
lifetime value
CAC
—
acquisition cost
LTV:CAC Ratio
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target: 3.0+
Payback Period
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target: under 12 mo
Rule of 40
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target: 40+
Avg Customer Lifetime
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months until churn
Monthly Churn
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% customers lost/mo
Annual Churn
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compounded over 12 mo
💡 What these numbers mean
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📚 Master SaaS unit economics
📚 See top-rated SaaS metrics books on Amazon →📝 How to use this SaaS metrics calculator
- Enter paying customers — the count of active subscription accounts at the start of the month.
- Enter MRR — your monthly recurring revenue. For annual contracts, divide the annual fee by 12 to get the monthly equivalent.
- Enter monthly churn % — the percentage of customers who cancelled last month. If you only track revenue churn, use the same number here (it does not change the LTV math).
- Enter CAC — your fully-loaded customer acquisition cost: total sales + marketing spend divided by new customers added that period.
- Enter gross margin % — revenue minus hosting, support, and payment processing. Most SaaS companies land between 70-85%.
- Enter YoY growth and profit margin — for the Rule of 40 score. Leave growth at 0 if you do not want Rule of 40.
- Click Calculate — see ARR, ARPU, LTV, LTV:CAC ratio, payback period, average customer lifetime, and Rule of 40 instantly.
📌 5 tips to improve your SaaS metrics
- ✓ Cut churn before anything else. Halving monthly churn from 4% to 2% roughly doubles customer lifetime and LTV — a bigger impact than any pricing or conversion lever.
- ✓ Price on value, not cost. The fastest way to lift ARPU is annual plans with a 15-20% discount (locks in cash, lowers churn) or usage-based pricing for power users.
- ✓ Track net revenue retention (NRR). NRR above 100% means expansion revenue beats churn — the SaaS compounder's dream. Top-quartile public SaaS hits 120%+ NRR.
- ✓ Separate sales-led vs. PLG CAC. Self-serve funnels have near-zero marginal CAC; enterprise sales has $5K+ CAC. Blended CAC hides where to invest.
- ✓ Reinvest payback-period cash, not ARR. The first 12 months of recovered CAC is the engine for compounding growth — plow it back into the channel that delivered the best LTV:CAC.
Disclaimer: This calculator provides SaaS metric estimates for educational and planning purposes only. Outputs assume constant churn, no expansion revenue, and stable CAC. Real-world metrics fluctuate with cohort behavior, seasonality, and pricing changes. Not financial advice — consult a CFO or financial advisor for investment or fundraising decisions.
Related Tools
SaaS metrics are one slice of business financial health. These nine calculators cover the rest — from break-even analysis and burn rate to working capital, ROI, overhead costs, profit margin, and overall financial health scoring.
- Break-Even Calculator — find the monthly MRR or sales volume where your SaaS becomes default-alive and CAC payback is fully covered.
- Burn Rate Calculator — how many months of cash runway does your SaaS have at the current net burn; the constraint on growth investment.
- Working Capital Calculator — if annual prepays and quarterly contracts dominate your cash cycle, see if short-term liquidity covers the gaps.
- ROI Calculator — measure the return on every growth dollar: how each paid channel or sales hire earns back against its CAC.
- Profit Margin Calculator — the complement to gross margin: how much of every MRR dollar survives to operating profit after opex.
- Markup Calculator — set the right pricing for new tiers and add-ons; the inverse math of margin, useful for SaaS price-list design.
- Overhead Cost Calculator — the fixed and semi-fixed costs that your SaaS must cover before contribution margin from MRR turns to profit.
- Loan Payment Calculator — if you took venture debt or a SaaS lending facility, model the monthly debt service against your MRR coverage.
- Financial Health Score Calculator — a 10-factor composite score that places your SaaS metrics in the full picture of business financial health.