Here is a link to one: http://www.inrpro.com/article.asp?id=27

I have just downloaded it and haven't tried it yet. I have a home-made one also in an Excel sheet but it is a little bit cumbersome to use.

Thank you Sam. I apologize for the delay with which I saw your response.

I hope you got it to work

Now I've tried it, and it works well. Quite simple to use, indeed. However, I think that an app for mobile devices would be better for both patients and physician. This is because an anticoagulation clinic is not available wordlwide and I suspect that the cost of many centers will be not more sustainable in many countries in the era of DOACs. Nevertheless, thank you for the suggestion.

You can use Roosendaal Method brother.