A worked example
An 18-month example
- Start with
- Enlist 2026-01-01 · Army 18 months · no extension
- Check the result
- Estimated discharge: 2027-06-30
The model adds 18 months to enlistment, then subtracts one day.
Everyday tool
Korean Military Discharge Date Calculator
Enter enlistment and service category to estimate discharge, remaining days, and the last duty day after leave.
Leave changes the last-duty estimate, not the discharge date
Service categoryCurrent default terms published by the Military Manpower Administration.
South KoreaService category
Leave does not change the official discharge date.
It is used only to estimate the last day you may need to report for duty.
Estimated result
Estimated discharge dateSun, April 9, 2028D-547
Army / Reserve18 months
Service progress0.2%
Total service548 days
Days completed1 days
Days remaining547 days
Estimated last duty dayApr 9, 2028
Service milestonesBased on calendar days
- 25%Feb 24, 2027
- 50%Jul 11, 2027
- 75%Nov 24, 2027
- 100%Apr 9, 2028
This calculator provides an estimate. The date recorded by the unit or Military Manpower Administration takes precedence.
Default service terms
Military Manpower Administration source ↗Army and Marines 18 months · Navy 20 months · Air Force 21 months · Social service 21 months · Alternative service 36 months
Service timeline
Keep discharge and last duty day separate
Set enlistment and term
Choose the enlistment/call-up date and category. Use Custom to model a different number of service months.
Separate extensions from leave
Additional service days move the discharge estimate later. Remaining leave is subtracted only for the estimated last duty day.
Read progress as of today
Review D-day, progress, and the 25/50/75/100% milestone dates. Compare the estimate with unit or official personnel records.