A joint World Bank and UN assessment said Georgia would need around $3.4 billion over the next three years to support the economy, rebuild damaged infrastructure and help internally displaced people.
The European Commission earlier pledged up to 500 million euros ($662.3 million) for the country until 2010 and also invited individual donors to contribute money.
The conference will be co-chaired by the European Commission and the World Bank, and attended by EU members, other countries and financial institutions.
Western nations have criticized Russia for using excessive force in its response to ex-Soviet Georgia's attack on its rebel republic of South Ossetia, which broke away from central control after a bloody conflict in the early 1990s.
Moscow has urged international aid for the breakaway region which suffered major civilian casualties and destruction during the conflict.
