Work Experience Calculator
Enter when each job started and ended. See your total experience in years, months and days — with overlaps counted once and gaps between jobs listed.
Both the start and end dates count as working days. Starting and leaving on the same day counts as 1 day.
Checking today's date…
Total experience (overlaps counted once)
7 years, 1 month, 23 days
- Sum of all jobs (overlaps counted twice)
- 7 years, 2 months, 9 days
- Overlap
- 16 days
- Total months
- 85 months (+23 days)
- Total days
- 2,611 days
Gaps between jobs
- 2023-12-30 – 2024-03-03 · 0 years, 2 months, 3 days (65 days)
When adding several periods, every 30 days count as 1 month.
How we count
- Both the start and end dates count as working days. Starting and leaving on the same day counts as 1 day.
- A month runs from the start date up to (and including) the day before the same date next month. For example, starting on March 2 means April 1 completes 1 month.
- If the next month doesn't have the same date, the month ends on that month's last day. Starting on January 31 completes 1 month on the last day of February; starting on February 29 completes 1 year on February 28 the following year.
- When adding several jobs together, every 30 leftover days are carried over as 1 month.
- Overlapping periods are counted once in your total experience. Starting a new job the day after leaving the previous one counts as continuous, with no gap.
- Current jobs are counted up to today, Korea time.
Why work experience calculations get confusing
How long you've actually worked depends on exactly how the start and end dates are counted. Jobs that start at the end of a month, or span a leap year's February 29, can make it unclear how many days are in "one month" — and if you've held more than one job at once, simply adding up the dates doesn't match your real experience. This calculator counts both the start and end date of each job, and measures months using calendar rules instead of a flat 30-day month. When you add more than one job, it shows your total experience with overlaps counted once, the simple sum of every job added together, and any gaps between jobs.
Where is work experience used?
Job applications
Many job postings require "N+ years of experience." How experience is counted (related roles only, overlapping jobs, etc.) can vary by employer, so check the posting or ask the hiring team.
Salary negotiation
Total years of experience are often used as a reference point when negotiating pay at a new job. Confirm how the new employer counts prior experience before negotiating.
Checking an employment certificate
Use this to double-check that the dates on a certificate of employment from a previous job match your own records.
Pay-grade calculation
Some public institutions and companies set pay grade based on total years of experience. What counts (e.g. only experience in the same field) varies, so check the relevant rules.
The 1-year severance pay requirement
Severance pay generally applies after 1 year or more of continuous employment, for employees averaging 15 hours or more per week over four weeks. Use this calculator to check how long you've worked, then see the exact requirements and estimated amount with the Severance Pay Calculator.
See your estimated amount with the Severance Pay CalculatorAnnual leave days
At workplaces with five or more regular employees, attending at least 80% of a working year gives you 15 days of annual leave. Check your length of service here, then see the exact requirements and unused leave payout with the Annual Leave Allowance Calculator.
See unused leave payout with the Annual Leave Allowance Calculator
When to use this
Tidying up your resume
Enter the start and end date of each job to get accurate employment periods for your resume.
Overlapping jobs (side work, freelancing)
If you worked more than one job at the same time, see your real experience with overlapping days counted only once.
Checking if a planned end date reaches 1 year
Still employed? Enter your planned end date to see whether your length of service will reach 1 year (or any target) by then.
Spotting gaps between jobs
See the exact gaps between jobs listed out, instead of estimating them yourself.
Worked examples
Default example — three jobs with overlap and a gap
With jobs from 2019-03-04 to 2021-08-31, 2021-08-16 to 2023-12-29, and 2024-03-04 to 2026-06-30, total experience with overlaps counted once is 7 years, 1 month, 23 days (2,611 days), and the simple sum is 7 years, 2 months, 9 days (2,627 days). The 2nd and 3rd jobs overlap by 16 days, counted once in the total. There's also a 65-day gap from 2023-12-30 to 2024-03-03.
Starting on the last day of a month
Starting on 2025-01-31 and working through 2025-02-28 counts as 1 month, 0 days (29 days). Working only through 2025-02-27 instead counts as 0 months, 28 days — a one-day difference in the end date changes the month count.
The 1-year severance pay boundary
Starting on 2025-03-02 and working through 2026-03-01 completes exactly 1 year, 0 months, 0 days (365 days). Severance pay also requires averaging 15+ hours per week over four weeks, so check your exact eligibility with the Severance Pay Calculator.
Things to keep in mind
- The dates on an employment certificate may differ from your actual employment period. Enter your first day of work as the start date, and the last day you actually worked as the end date.
- Whether leave periods (e.g. parental leave) count toward experience varies by employer or institution — check their specific rules.
- This calculator's month rounding (30 days = 1 month when adding several jobs) may differ from a company's own rounding rule (e.g. rounding up after 15 days).
- Whether part-time or freelance work counts as formal experience depends on where you're submitting it.
- The shared link (URL) never includes company names — only start and end dates are saved.
Frequently asked questions
- Do you count both the start and end date?
- Yes — both dates count, so starting and leaving on the same day is 1 day. Some employment certificates list the end date as the day after your last working day, so enter the actual last day you worked.
- How are months counted if I started on the 31st of a month?
- If the next month doesn't have that date, the month ends on that month's last day. For example, starting on January 31 completes 1 month on the last day of February.
- How is starting on leap day (February 29) handled?
- Starting on 2024-02-29 completes 1 year (366 days) on 2025-02-28, since 2025 has no February 29.
- How are overlapping jobs counted?
- Total experience (overlaps counted once) counts overlapping days only once, while the simple sum adds every job as-is. Check with whoever is reviewing your experience to see which figure they expect.
- Does starting a job the day after leaving the last one count as a gap?
- No — since there's no day off in between, it's treated as continuous employment with a 0-day gap.
- What happens to leftover days in the total months figure?
- They're dropped and shown separately as "+D days." Because adding periods together carries every 30 days as 1 month, this can differ from a calendar count by a day or two. Rounding rules vary by employer or institution.
- If I'm still employed, what date is used?
- Today's date in Korea time. A shared link with a current job recalculates using today's date whenever it's opened.
- How long do I need to work to get severance pay?
- Generally 1 year or more of continuous employment. Check Ministry of Employment and Labor guidance for details, and estimate the amount with the Severance Pay Calculator.
Official Sources
Always verify with the official sources below