资本适足率指商业银行资本充足程度的比率。

按照《巴塞尔协议》，资本充足率的最低标准为：银行资本和风险加权的总资产之间比率至少为8%，其中核心资本和风险加权的总资产之间比率至少为4%。

Capital Adequacy Ratio (CAR), also known as Capital to Risk (Weighted) Assets Ratio (CRAR), is the ratio of a bank's capital to its risk. National regulators track a bank's CAR to ensure that it can absorb a reasonable amount of loss and complies with statutory Capital requirements.