PureBuild is a collection of free, deterministic calculators designed for startup founders and builders. Our tools help you make data-driven decisions about equity, dilution, runway, unit economics, and more.

Are PureBuild tools really free?

Yes, all PureBuild tools are completely free to use. No sign-up required, no hidden fees, no premium tiers. We believe essential business calculations should be accessible to everyone.

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What tools does PureBuild offer?

PureBuild offers 9+ specialized calculators including: Equity Calculator, Dilution Simulator, Runway Calculator, Unit Economics Modeler, Payment Gateway Fee Calculator, API Token Cost Estimator, Database Capacity Planner, Viral Coefficient Calculator, and True Hourly Rate Calculator.

How do I calculate LTV (Customer Lifetime Value)?

LTV = (Average Revenue Per User × Gross Margin) ÷ Churn Rate. For example, if ARPU is $100/month, margin is 70%, and monthly churn is 5%, LTV = ($100 × 0.7) ÷ 0.05 = $1,400.

What is CAC (Customer Acquisition Cost)?

CAC is the total cost of sales and marketing divided by the number of new customers acquired. Include salaries, ad spend, tools, and overhead in your calculation.

What is a good CAC payback period?

For SaaS, a payback period under 12 months is considered healthy. Under 6 months is excellent. Over 18 months may indicate unsustainable growth.

How do I calculate LTV (Customer Lifetime Value)?

LTV = (Average Revenue Per User × Gross Margin) ÷ Churn Rate. For example, if ARPU is $100/month, margin is 70%, and monthly churn is 5%, LTV = ($100 × 0.7) ÷ 0.05 = $1,400.

What is CAC (Customer Acquisition Cost)?

CAC is the total cost of sales and marketing divided by the number of new customers acquired. Include salaries, ad spend, tools, and overhead in your calculation.

What is a good CAC payback period?

For SaaS, a payback period under 12 months is considered healthy. Under 6 months is excellent. Over 18 months may indicate unsustainable growth.

SaaS Unit Economics Calculator: LTV:CAC Ratio & Payback Period

PUREBUILD UE-5000

LIFETIME VALUEINPUT MODE

PROGRESS0/2 REQUIRED

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50,000+ calculations

Last updated: 2025-01

Runway Calculator

Track burn rate and forecast runway

Viral Coefficient

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Net Revenue

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Frequently Asked Questions

A healthy LTV:CAC ratio is 3:1 or higher, meaning customer lifetime value should be at least 3x the cost to acquire them. Below 1:1 means you're losing money on every customer.

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