How do I know how much KV is being used to store?

Cloudflare kv storage total how to check so i can expect to budget for the storage needs

If you go to a zone in the dashboard, you can find this in analytics -> workers at the bottom of the page, titled “Workers KV (per account)”:

Where is the “zone in the dashboard?”

That is any website you have added on your CF account. You can also use this link - https://dash.cloudflare.com/?to=/:account/:zone/analytics/workers - but you do need a non-workers.dev website to see these analytics right now.