# Free tools for the numbers behind your ads

> Free marketing tools that run in your browser: a cost per buyer and ROAS calculator, a UTM link builder and an A/B test calculator. No sign-up; what you type is not sent.

URL: https://mirafive.io/tools

Three small tools that run in your browser. Nothing you type leaves the page, and none of them needs an account.

## Cost per buyer and ROAS calculator

Cost per buyer, ROAS, break-even ROAS and profit after ads from four numbers.

[Open the tool](https://mirafive.io/tools/roas-calculator)

## UTM link builder

Tag a link and see which channel its visits land in, by MIRA FIVE’s own rules.

[Open the tool](https://mirafive.io/tools/utm-builder)

## A/B test calculator

The smallest change an A/B test can find in 2 to 8 weeks, with the maths MIRA FIVE uses.

[Open the tool](https://mirafive.io/tools/ab-test-calculator)

MIRA FIVE works these numbers out for every campaign, every day, from your own paid orders.

## See which channel brings buyers

Free for 25,000 events a month. No card needed.

[Start free](https://app.mirafive.io/register)[See pricing](https://mirafive.io/pricing)