Half Birthday & Anniversary Calculator
Find your half birthday, how long you've been together, your next anniversary and the traditional anniversary gift for each year.
How to use
- 1Enter the date (birthday or the day you got together / married).
- 2Choose birthday or anniversary.
How it's calculated
Half birthday = birthday + 6 months (clamped to the month's end, so 31 Aug → 28/29 Feb). Anniversary gifts follow the traditional US/UK list.
Frequently asked questions
What's my half birthday if I was born on 31 August?
The end of February — 28 February (or 29 in leap years), since February has no 31st.
What are the big anniversary milestones?
Traditionally 25 years silver, 40 ruby, 50 gold and 60 diamond.
Are there modern gift lists too?
Yes — modern lists differ (e.g. year 1 is clocks). This tool shows the traditional list.