oddsconv.com is a free, ad-free collection of betting calculators ported from a native iOS app of the same name. Every calculator runs entirely in your browser; no inputs, bets, or browsing history are sent to a server. Bet history (when you choose to save calculations) is stored in your browser's local storage and only on your device.
This page also lists problem-gambling helplines for every major market we support: the United States and Canada, the United Kingdom, Australia, New Zealand, France, Spain, Germany, Portugal, South Africa, Brazil, plus international 24-hour resources. If betting has stopped feeling like fun for you or someone you know, please reach out to the appropriate service — they are confidential and free to use.