Understanding image transformation pricing

We would like to use Cloudflare Images resize on-the-fly service. With a lot of images on the site we’re concerned about the cost. We’re a on the Pro plan and have image optimisation and caching features enabled.

It’s not clear if image transformations will happen once or multiple times for the same transformation. All our images are served from CF edge at present any way so we should not incur a huge jump in costs via cache. So it’s the transformations we’d like clarity on please.

You can estimate your monthly cost by following these instructions: