Calculators

Build consistent, lowercase UTM-tagged campaign links in your browser.

Check whether a difference in conversion rates is statistically significant, and how many visitors a test needs.

Customer lifetime value, LTV to CAC ratio and CAC payback months from revenue, margin, churn and acquisition cost.

The return on ad spend you need to break even or hit a profit target, and the most you can pay per order.

Net Promoter Score from promoters, passives and detractors, with the 95% margin of error that says whether a change is real.

How many responses a survey needs for a given margin of error and confidence, with the finite population correction.

Click-through rate from clicks and impressions, and the clicks you would gain at a higher CTR.

Conversion rate from visitors and conversions, with a confidence interval and the visitors needed to hit a target.

Cost per acquisition from spend and conversions, and the most you can pay per conversion at your margin.

Convert between CPM, CPC, CTR, spend, impressions and clicks: enter any three and get the rest.

Customer churn, revenue churn and net revenue retention for a month, with the monthly and annual conversions.

Paste cohort sizes and active counts to get a retention table, average curve and the month retention flattens.

Marketing ROI and ROAS from spend, attributed revenue and gross margin, on revenue and on profit.

Net list growth rate from new subscribers, unsubscribes, bounces and complaints, and a 12-month projection.