A usage metering system for determining computer resource utilization is described herein. Computer resource utilization is determined by accumulating instances of computer resource utilization based on array of counters. This enables an accurate determination of instances of when a predetermined threshold baseline of computer resource utilization is exceeded over an accumulated period of time. By using an array of counters to collect data rather than averaging values over time, a more accurate indication of computer resource utilization is determined. The usage metering system has little impact on computer system resources, because snapshots can be taken on a fairly infrequent basis, and any computer resource utilization calculations can be performed on computer platforms separated from the system being monitored.