Free Marketing Calculators and Tools

Calculators we use when planning tests, budgets and campaigns for B2B websites. Each runs in your browser, shows the formula it uses and explains how to read the result. For the thinking behind the numbers, see our guides to B2B marketing KPIs and running a CRO audit.

• A/B Test Calculator

  Sample size, test duration and statistical significance for conversion tests.

• Conversion Rate Calculator

  Conversion rate from visitors and conversions, and what a target rate is worth.

• CTR Calculator

  Click-through rate from impressions and clicks, or expected clicks from a CTR.

• CPM Calculator

  Solve for CPM, total cost or impressions when you know the other two.

• ROAS Calculator

  Return on ad spend, plus the break-even ROAS for your gross margin.

• CAC Calculator

  Blended customer acquisition cost and CAC payback period in months.

• Cost per Lead Calculator

  Cost per lead, per qualified lead and per customer for a channel.

• Marketing ROI Calculator

  Campaign ROI on gross profit, not just revenue.

• UTM Builder

  Build clean, consistent campaign URLs for GA4 and your CRM.