● FREE TOOL
How long have you been together?
A relationship milestone calculator works out the exact length of a relationship — in years, months, days, and total days — from the date it started, and shows how many days remain until the next anniversary.
How to use this tool
Enter the date it started
Pick the day you consider the real start — first date, first "I love you," moving in, whatever milestone matters to you two.
Get the exact breakdown
See it broken into years, months, and days, plus the total day count and a countdown to your next anniversary.
Copy the sentence, or mark it with a letter
Copy the one-line summary to share, or turn the milestone into a full anniversary letter with photos.
Frequently asked questions
What date should I use as the start of a relationship?
Whatever the two of you actually count as the start — a first date, the day you made it official, or a moment that felt like the real beginning. There's no universal rule; use the date that matters to your relationship.
How is the total day count calculated?
It's the exact number of calendar days between your start date and today, calculated directly — not an estimate or rounded average.
What if we don't remember the exact date?
Use your best estimate — the month and a rough day is usually close enough for a milestone number like this. Precision to the day only matters if you want an exact count for something like a "1,000 days together" milestone.
Can I use this for a long-distance relationship?
Yes — the calculation works the same regardless of distance. If you're looking for a countdown to when you'll next see each other rather than how long you've been together, that's a different kind of calculation this tool doesn't do.