The research aimed at calculating the Operational Value at Risk (OpVar) in estimating the probability of the frequency of losses at Sharia Bank of XYZ, analyzing and assessing the event types of operational risks which have a great contribution in the operational losses of the bank, and determining the efficiency levels of the operational value at risk of capital charges of the bank. Measurement of operational risk in this study was conducted using the Loss Distribution Approach (LDA) Aggregated Model, as one of the Advanced Measurement Approach (AMA) models, which theoretically produces more efficient capital charges. The results showed that the contribution of the biggest losses came from the events of business disruption and system failure, execution, delivery & process management and internal fraud. The calculation of the operational risk of the bank conducted using the LDA-Aggregate produced lower capital charges than those using the Basic Indicator Approach.