OPM Compliance: This calculator uses the 360-day year (30 days/month), finds the highest 36 consecutive months — not the last 36 — and prorates partial months exactly per OPM FERS Handbook Chapter 50.

FERS High-3 Average Salary Calculator

Enter each period where your GS grade, step, or locality changed. We'll find the highest 36-month window using OPM's 360-day year rule.

Separation Date (or today if still employed)

Defaults to today if left blank

Career History

Add a row for each time your grade, step, or locality changed

Effective Date

Date required

Grade

Step

Locality Area

Disclaimer: This tool is for educational purposes only. Results are estimates based on published GS pay tables and OPM rules. Always verify your High-3 with your agency HR office or OPM directly before making retirement decisions.