Americans’ confidence in their ability to retire appears to be stabilizing, a study by the Employee Benefit Research Institute concludes.

The 2010 Retirement Confidence Survey by EBRI, Washington, also found, however, that many American workers are planning to postpone retirement and that their self-described preparations for retirement continue to erode.

“Americans are starting to feel more optimistic about their financial futures and now is the time to back that up with action,” said Daniel J. Houston, president of retirement, insurance and financial services at Principal Financial Group Inc., Des Moines, Iowa, which underwrote the survey.

Among the key findings in the 2010 Retirement Confidence Survey:

*Americans’ confidence in their ability to afford a comfortable retirement is leveling off as economic volatility has settled down. The Retirement Confidence Survey measured sharp drops in public confidence in 2008 and 2009.

*Preparations for retirement, however, seem to be getting worse, as a growing number of workers reported they have virtually no savings and investments. More than half said they have less than $25,000 in total savings and investments, excluding their homes.

*Less than half of all workers say they have tried to calculate how much they need to save for retirement.