SaaS metrics answer three questions: how fast is recurring revenue growing, how well do customers stay, and how efficiently does spending turn into growth. Most mistakes come from mixing definitions, like counting one-off fees in MRR or multiplying monthly churn by 12.
These calculators follow standard definitions and show the formula with your numbers, so the figures in your deck match what an investor would calculate. Work through them top to bottom for a full health check.
1. Recurring revenue and growth
Start with MRR and ARR, then look at where growth comes from: new customers, expansion, and what you lose to churn and downgrades.
- MRR to ARR CalculatorConvert monthly recurring revenue to annual run rate, and see how new, expansion, and churned revenue move the number next month.
- SaaS Quick Ratio CalculatorMeasure how efficiently your SaaS grows: new and expansion revenue gained for every dollar lost to churn and downgrades.
- Net Revenue Retention (NRR) CalculatorMeasure how much revenue your existing customers generate compared with a period ago, including upgrades, downgrades and cancellations.
2. Retention
Churn rate gives the headline; a cohort table shows whether newer customers stay longer than older ones, which a single number hides.
- SaaS Churn Rate CalculatorCalculate customer churn and revenue churn for a month, annualize it correctly, and see how long the average customer stays.
- SaaS Cohort Retention Table GeneratorPaste monthly signups and active customers to see a cohort retention heatmap, weighted averages by month, and export it as CSV.
3. Acquisition efficiency
What it costs to win a customer, how long it takes to earn that back, and whether sales and marketing spend is producing enough new revenue.
- Customer Acquisition Cost (CAC) CalculatorWork out what each new customer costs you from your sales and marketing spend, and how long it takes to earn that cost back.
- LTV to CAC Ratio CalculatorCompare what a customer is worth over their lifetime with what it costs to win them, and see how long it takes to earn the acquisition cost back.
- SaaS Magic Number CalculatorFind out how much new annual revenue each dollar of sales and marketing spend produced, and whether it is time to spend more.
- SaaS Unit Economics CalculatorChurn, customer lifetime value, CAC payback, and gross margin: four numbers that explain each other, calculated from one set of inputs.
4. Survival and balance
How many months the cash lasts, and whether growth and profitability together clear the Rule of 40.
- Burn Rate and Runway CalculatorSee how much cash your company loses each month and how many months you have left before the bank balance runs out.
- Rule of 40 CalculatorAdd your revenue growth rate and profit margin to see whether your SaaS business meets the Rule of 40 benchmark.
- SaaS Valuation Calculator: ARR Multiple MethodEstimate a SaaS company's value from ARR and a revenue multiple range, see the value of your stake, and check the growth and retention signals that move the multiple.
5. Pricing and payments
Set the annual discount, and see what payment processors and app stores take from each sale.
- Annual vs Monthly Pricing CalculatorSet your annual plan discount with confidence: see the annual price, what customers save, and the discount at which annual earns you as much as monthly plans that churn.
- Payment Processor Fee Comparison (Stripe, PayPal, Paddle, Lemon Squeezy, Gumroad)Compare what Stripe, PayPal, Paddle, Lemon Squeezy and Gumroad would charge on your price and sales volume, including international buyers and tax handling.
- App Store Fee Calculator: In-App vs Web CheckoutCompare what you keep from in-app purchases after Apple's or Google's commission with what you would keep selling through your own web checkout.
Questions people ask
Which SaaS metrics matter most at the early stage?
MRR growth, churn and CAC payback. Together they show whether customers want the product, whether they stay, and whether you can afford to acquire more of them. Ratios like the Rule of 40 matter more later.
Why don't my churn numbers match between tools?
Usually because of definitions: customer churn vs revenue churn, monthly vs annual, and whether new customers in the month are counted. Each calculator here states its definition next to the formula.
What's the difference between NRR and the quick ratio?
NRR looks only at existing customers: does revenue from them grow or shrink? The quick ratio compares all MRR added, including new customers, with all MRR lost.