How to Estimate Your CalSTRS Pension: A Step-by-Step Walkthrough With Real Numbers

The three inputs, and why the age factor table is the part people get wrong

Every CalSTRS pension estimate comes down to multiplying three numbers together: your age factor (a percentage set by your age at retirement and which benefit structure you're in), your years of service credit, and your final compensation (generally an average of your highest-paid consecutive years, with the exact averaging period depending on your structure and years of service). Most estimate confusion traces back to the age factor step, because two members retiring at the same age can have different age factors if they're in different benefit structures.

The age factor table: CalSTRS 2% at 60 vs. 2% at 62

Below are the published age factors for both structures. Note that both reach the same maximum of 2.40% at age 65, but the classic 2%-at-60 structure reaches any given percentage at a younger age than PEPRA's 2%-at-62 structure does — which is the entire basis for the two structures' names.

The career factor: a classic-structure bonus PEPRA doesn't get

Members in the classic 2%-at-60 structure who retire with 30 or more years of earned service credit receive an additional 0.2% added to their age factor, up to the same 2.40% combined maximum. PEPRA (2% at 62) members do not receive this career-factor bonus under any circumstance, regardless of years of service — one more way the two structures diverge beyond just the age-factor table itself.

A worked example

Take a classic-structure (2% at 60) member retiring at age 60 with 25 years of service credit and a final compensation of $80,000. The age factor at 60 for the classic structure is 2.00%. The calculation is 2.00% × 25 × $80,000 = $40,000 per year, or roughly $3,333 per month, before any deductions.

Now take a PEPRA member retiring at the same age (60) with the same 25 years of service and the same $80,000 final compensation. Their age factor at 60 is 1.76%, not 2.00%, giving 1.76% × 25 × $80,000 = $35,200 per year — about $4,800 less per year than the classic-structure example, purely because of which structure applies, with every other input held identical.

Where this walkthrough stops and CalSTRS's own tools take over

This walkthrough uses the published age factor table and the basic formula to show you the mechanics, but your actual final compensation calculation depends on details specific to your service record — which years count as your highest-paid period, whether unused sick leave adds service credit, and any other service-credit purchases you've made. For an estimate that reflects your actual account, use CalSTRS's own online retirement estimate calculator through your myCalSTRS account, which pulls your real service and salary history rather than the illustrative numbers used here.

How the Defined Benefit Supplement fits in (if you have one)

Some CalSTRS members also have a Defined Benefit Supplement account, generally built up from contributions on earnings above a certain threshold in past years, or from certain types of additional compensation. This account operates separately from the age-factor-times-service-times-compensation formula covered in this walkthrough, and its balance is generally paid out as an additional lump sum or annuity option at retirement, on top of your standard Defined Benefit calculation rather than folded into it.

If your CalSTRS statement shows a Defined Benefit Supplement balance, treat the walkthrough in this guide as covering only your standard Defined Benefit portion — your total retirement income estimate needs to add the Supplement account separately, using whatever payout option you choose for that specific account.

Don't forget final compensation averaging rules

The worked examples in this guide use a single final compensation figure for simplicity, but your actual final compensation is generally an average over multiple consecutive years, not your single highest-paid year — the exact averaging period and any one-year exceptions depend on your benefit structure and years of service, so confirm your specific final compensation calculation through your myCalSTRS account rather than assuming your most recent salary applies directly.