Basically, your annual/monthly benefit increases by 2% of your highest consective 24 months of salary for every year of service (10 year = 20%, 20 years = 40%, 30 years = 60%, etc.).
DISCLAIMER: This pension calculator is provided solely as an estimating tool; all results should be considered approximations. Since the calculator does not use actual data from your TRS service and salary records, you should not consider the estimates it produces as final determinations of your retirement benefit. Accordingly, no estimate so produced shall be in any way binding upon TRS, which has sole authority under law to determine your retirement benefits. Your actual retirement benefit will be determined when you formally apply for retirement.