The present paper investigated a developed method for the quantitative evaluation of involvement of countries in the international open access movement. It identified eight country open access indices which were initially connected with open access initiatives and instruments, their weighing, normalization and aggregation in a weighted average value. In a second more strict approximation, the number of indices was reduced up to six for the account of discarding duplicated data in ROAR and Open DOAR. Budapest initiative and Berlin declaration were considered as ОА-initiatives; and data of the international registers, DOAJ, SHERPA/RoMEO, ROAR MAP and the Webometrics ОА-repositories ranking, was considered as the tools. The calculation was done on the basis of a developed method for 133 countries.

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