Promo rate calculator

Work out what an introductory rate actually costs once it expires — and the date you need to decide by. Everything is calculated in your browser; nothing is sent anywhere.

Doing this for every subscription is the hard part. Renewals keeps the dates and the post-promo prices for everything you track, and reminds you before each one changes. Free for 7 days, then one payment, never a subscription. Try it free on the App Store.

How the maths works

The annual figure is the per-period increase multiplied by the number of billing periods in a year — twelve for monthly, fifty-two for weekly, four for quarterly, one for yearly. It is the number worth knowing, because a increase that looks small per month is what you are actually committing to across a year.

The decide-by date is simply the promotional end date minus your chosen lead time. The lead time matters: cancellation can involve a notice period or a support queue, and deciding on the deadline itself often means missing it.

A note on accuracy

This calculator performs arithmetic on the numbers you enter, entirely in your browser. It does not look up any company's pricing, and the figures in the placeholder text are illustrative examples rather than any real offer. Its output is an estimate, not financial advice, and assumes your inputs are correct and that nothing changes. Check your own agreement for the post-promotional rate that applies to you — it is usually stated there, and it is occasionally different from what was advertised at signup.