Enter your hire date and last day (or leave it open if you still work there) to see your exact service in years, months and days, the total days and weeks, and when your next work anniversary falls. Add more periods to combine service across a rehire or break.
Last updated:
Employment periods
Leave the end date empty (or tick "Still employed") to count up to today. Several periods are added together, so you can include a rehire or a break in service.
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How to use the Length of Service Calculator
Enter your start (hire) date. Use the first day you were on the payroll.
Enter your last day, or tick “Still employed” to count up to today.
Add another period if you left and were rehired and want the service combined.
Tick the inclusive box if your employer counts the last day as a day of service.
Read the result: years, months and days, totals, your next anniversary and the milestone table, then copy the summary.
How years of service are counted
Length of service is the time between your first day of employment and either your last day or today. The calculator uses calendar arithmetic, the same way people count ages:
Whole years: step forward one anniversary at a time until the next one would pass the end date.
Whole months: from the last anniversary, step forward month by month. If the start day does not exist in a month (for example the 31st), the last day of that month is used.
Days: whatever is left until the end date.
Total days are simply end date − start date. Ticking the inclusive option adds one day so that both the first and the last day count as days worked.
Examples
Start date
End date
Service
Total days
Mar 16, 2015
Oct 24, 2026
11 years, 7 months, 8 days
4,240
Jan 7, 2019
Jun 30, 2024
5 years, 5 months, 23 days
2,001
Jan 7, 2019
Jun 30, 2024 (inclusive)
5 years, 5 months, 24 days
2,002
Jan 31, 2025
Feb 28, 2025
0 years, 1 month, 0 days
28
Where length of service matters
Paid time off: many leave policies raise the accrual rate after 3, 5 or 10 years.
Severance: packages are often quoted as a number of weeks of pay per year of service.
Retirement and vesting: pension and 401(k) vesting schedules depend on years of service, though plans may count hours worked per year rather than calendar time.
Recognition: service awards are usually given at 5, 10, 15, 20 and 25 years.
Résumés and applications: forms often ask for employment length in years and months.
Employers define service in their own policies (for example whether unpaid leave or a short break interrupts continuous service). Use this result as a clear calendar count and check the policy for how it applies to you.
Frequently asked questions
How is length of service calculated?
Count the complete years from the start date, then the complete months after the last anniversary, then the remaining days up to the end date. For example, from March 16, 2015 to October 24, 2026 is 11 years, 7 months and 8 days, or 4,240 days.
Should the last day be included?
It depends on the policy. Simple date math (end minus start) does not count the last day, which is how most calculators and spreadsheets work. Many HR and pension rules count both the first and the last day worked, which adds one day; tick the inclusive box to do that.
How do I combine service from two jobs or a rehire?
Add each period on its own row. The calculator works out years, months and days for each period, adds them together and turns every 30 days into a month and every 12 months into a year, which is the usual convention for combined service. Total days are simply added.
What is an adjusted service date?
It is your latest start date moved back by the service you already had, so it reflects your total creditable service. Employers such as the US federal government use a similar service computation date to decide leave accrual and other service-based benefits.
How do I work out years of service in decimal form?
Divide the total number of days by 365.2425, the average length of a Gregorian year. 4,240 days is 11.61 years. Some employers use 365 instead, which gives a slightly larger figure.
When is my work anniversary if I started on February 29?
In years without February 29 the anniversary is taken as February 28, the last day of February, which is what this calculator uses. Some employers use March 1 instead.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.