Your half birthday is the same day of the month, six months after your birthday. This chart lists the half birthday for every date of the year, month by month. Dates that move because the next month is shorter are shown in bold.
Prefer to type your date? The half birthday calculator also shows the day of the week, how many days are left and your age on the day.
Half birthday by month
| Birthday month | Half birthday month | Dates that change |
|---|---|---|
| January | July | None |
| February | August | None |
| March | September | 31 March → 30 September |
| April | October | None |
| May | November | 31 May → 30 November |
| June | December | None |
| July | January | None |
| August | February | 29, 30 and 31 August → 28 February (29 in a leap year) |
| September | March | None |
| October | April | 31 October → 30 April |
| November | May | None |
| December | June | 31 December → 30 June |
The rule behind the chart is explained on our method page.
January half birthdays
Every January birthday has a half birthday on the same day in July, because July has 31 days.
| Birthday | Half birthday |
|---|---|
| 1 January | 1 July |
| 2 January | 2 July |
| 3 January | 3 July |
| 4 January | 4 July |
| 5 January | 5 July |
| 6 January | 6 July |
| 7 January | 7 July |
| 8 January | 8 July |
| 9 January | 9 July |
| 10 January | 10 July |
| 11 January | 11 July |
| 12 January | 12 July |
| 13 January | 13 July |
| 14 January | 14 July |
| 15 January | 15 July |
| 16 January | 16 July |
| 17 January | 17 July |
| 18 January | 18 July |
| 19 January | 19 July |
| 20 January | 20 July |
| 21 January | 21 July |
| 22 January | 22 July |
| 23 January | 23 July |
| 24 January | 24 July |
| 25 January | 25 July |
| 26 January | 26 July |
| 27 January | 27 July |
| 28 January | 28 July |
| 29 January | 29 July |
| 30 January | 30 July |
| 31 January | 31 July |
February half birthdays
February birthdays have half birthdays in August. A birthday on 29 February has a half birthday on 29 August, which exists every year.
| Birthday | Half birthday |
|---|---|
| 1 February | 1 August |
| 2 February | 2 August |
| 3 February | 3 August |
| 4 February | 4 August |
| 5 February | 5 August |
| 6 February | 6 August |
| 7 February | 7 August |
| 8 February | 8 August |
| 9 February | 9 August |
| 10 February | 10 August |
| 11 February | 11 August |
| 12 February | 12 August |
| 13 February | 13 August |
| 14 February | 14 August |
| 15 February | 15 August |
| 16 February | 16 August |
| 17 February | 17 August |
| 18 February | 18 August |
| 19 February | 19 August |
| 20 February | 20 August |
| 21 February | 21 August |
| 22 February | 22 August |
| 23 February | 23 August |
| 24 February | 24 August |
| 25 February | 25 August |
| 26 February | 26 August |
| 27 February | 27 August |
| 28 February | 28 August |
| 29 February | 29 August |
March half birthdays
March birthdays have half birthdays in September. September has 30 days, so a 31 March birthday moves to 30 September.
| Birthday | Half birthday |
|---|---|
| 1 March | 1 September |
| 2 March | 2 September |
| 3 March | 3 September |
| 4 March | 4 September |
| 5 March | 5 September |
| 6 March | 6 September |
| 7 March | 7 September |
| 8 March | 8 September |
| 9 March | 9 September |
| 10 March | 10 September |
| 11 March | 11 September |
| 12 March | 12 September |
| 13 March | 13 September |
| 14 March | 14 September |
| 15 March | 15 September |
| 16 March | 16 September |
| 17 March | 17 September |
| 18 March | 18 September |
| 19 March | 19 September |
| 20 March | 20 September |
| 21 March | 21 September |
| 22 March | 22 September |
| 23 March | 23 September |
| 24 March | 24 September |
| 25 March | 25 September |
| 26 March | 26 September |
| 27 March | 27 September |
| 28 March | 28 September |
| 29 March | 29 September |
| 30 March | 30 September |
| 31 March | 30 September |
April half birthdays
April birthdays have half birthdays in October on the same day.
| Birthday | Half birthday |
|---|---|
| 1 April | 1 October |
| 2 April | 2 October |
| 3 April | 3 October |
| 4 April | 4 October |
| 5 April | 5 October |
| 6 April | 6 October |
| 7 April | 7 October |
| 8 April | 8 October |
| 9 April | 9 October |
| 10 April | 10 October |
| 11 April | 11 October |
| 12 April | 12 October |
| 13 April | 13 October |
| 14 April | 14 October |
| 15 April | 15 October |
| 16 April | 16 October |
| 17 April | 17 October |
| 18 April | 18 October |
| 19 April | 19 October |
| 20 April | 20 October |
| 21 April | 21 October |
| 22 April | 22 October |
| 23 April | 23 October |
| 24 April | 24 October |
| 25 April | 25 October |
| 26 April | 26 October |
| 27 April | 27 October |
| 28 April | 28 October |
| 29 April | 29 October |
| 30 April | 30 October |
May half birthdays
May birthdays have half birthdays in November. November has 30 days, so a 31 May birthday moves to 30 November.
| Birthday | Half birthday |
|---|---|
| 1 May | 1 November |
| 2 May | 2 November |
| 3 May | 3 November |
| 4 May | 4 November |
| 5 May | 5 November |
| 6 May | 6 November |
| 7 May | 7 November |
| 8 May | 8 November |
| 9 May | 9 November |
| 10 May | 10 November |
| 11 May | 11 November |
| 12 May | 12 November |
| 13 May | 13 November |
| 14 May | 14 November |
| 15 May | 15 November |
| 16 May | 16 November |
| 17 May | 17 November |
| 18 May | 18 November |
| 19 May | 19 November |
| 20 May | 20 November |
| 21 May | 21 November |
| 22 May | 22 November |
| 23 May | 23 November |
| 24 May | 24 November |
| 25 May | 25 November |
| 26 May | 26 November |
| 27 May | 27 November |
| 28 May | 28 November |
| 29 May | 29 November |
| 30 May | 30 November |
| 31 May | 30 November |
June half birthdays
June birthdays have half birthdays in December on the same day.
| Birthday | Half birthday |
|---|---|
| 1 June | 1 December |
| 2 June | 2 December |
| 3 June | 3 December |
| 4 June | 4 December |
| 5 June | 5 December |
| 6 June | 6 December |
| 7 June | 7 December |
| 8 June | 8 December |
| 9 June | 9 December |
| 10 June | 10 December |
| 11 June | 11 December |
| 12 June | 12 December |
| 13 June | 13 December |
| 14 June | 14 December |
| 15 June | 15 December |
| 16 June | 16 December |
| 17 June | 17 December |
| 18 June | 18 December |
| 19 June | 19 December |
| 20 June | 20 December |
| 21 June | 21 December |
| 22 June | 22 December |
| 23 June | 23 December |
| 24 June | 24 December |
| 25 June | 25 December |
| 26 June | 26 December |
| 27 June | 27 December |
| 28 June | 28 December |
| 29 June | 29 December |
| 30 June | 30 December |
July half birthdays
Every July birthday has a half birthday on the same day in January, because January has 31 days.
| Birthday | Half birthday |
|---|---|
| 1 July | 1 January |
| 2 July | 2 January |
| 3 July | 3 January |
| 4 July | 4 January |
| 5 July | 5 January |
| 6 July | 6 January |
| 7 July | 7 January |
| 8 July | 8 January |
| 9 July | 9 January |
| 10 July | 10 January |
| 11 July | 11 January |
| 12 July | 12 January |
| 13 July | 13 January |
| 14 July | 14 January |
| 15 July | 15 January |
| 16 July | 16 January |
| 17 July | 17 January |
| 18 July | 18 January |
| 19 July | 19 January |
| 20 July | 20 January |
| 21 July | 21 January |
| 22 July | 22 January |
| 23 July | 23 January |
| 24 July | 24 January |
| 25 July | 25 January |
| 26 July | 26 January |
| 27 July | 27 January |
| 28 July | 28 January |
| 29 July | 29 January |
| 30 July | 30 January |
| 31 July | 31 January |
August half birthdays
August birthdays have half birthdays in February. February is the shortest month, so birthdays on 29, 30 and 31 August move to 28 February, or 29 February in a leap year.
| Birthday | Half birthday |
|---|---|
| 1 August | 1 February |
| 2 August | 2 February |
| 3 August | 3 February |
| 4 August | 4 February |
| 5 August | 5 February |
| 6 August | 6 February |
| 7 August | 7 February |
| 8 August | 8 February |
| 9 August | 9 February |
| 10 August | 10 February |
| 11 August | 11 February |
| 12 August | 12 February |
| 13 August | 13 February |
| 14 August | 14 February |
| 15 August | 15 February |
| 16 August | 16 February |
| 17 August | 17 February |
| 18 August | 18 February |
| 19 August | 19 February |
| 20 August | 20 February |
| 21 August | 21 February |
| 22 August | 22 February |
| 23 August | 23 February |
| 24 August | 24 February |
| 25 August | 25 February |
| 26 August | 26 February |
| 27 August | 27 February |
| 28 August | 28 February |
| 29 August | 28 February (29 in a leap year) |
| 30 August | 28 February (29 in a leap year) |
| 31 August | 28 February (29 in a leap year) |
September half birthdays
September birthdays have half birthdays in March on the same day.
| Birthday | Half birthday |
|---|---|
| 1 September | 1 March |
| 2 September | 2 March |
| 3 September | 3 March |
| 4 September | 4 March |
| 5 September | 5 March |
| 6 September | 6 March |
| 7 September | 7 March |
| 8 September | 8 March |
| 9 September | 9 March |
| 10 September | 10 March |
| 11 September | 11 March |
| 12 September | 12 March |
| 13 September | 13 March |
| 14 September | 14 March |
| 15 September | 15 March |
| 16 September | 16 March |
| 17 September | 17 March |
| 18 September | 18 March |
| 19 September | 19 March |
| 20 September | 20 March |
| 21 September | 21 March |
| 22 September | 22 March |
| 23 September | 23 March |
| 24 September | 24 March |
| 25 September | 25 March |
| 26 September | 26 March |
| 27 September | 27 March |
| 28 September | 28 March |
| 29 September | 29 March |
| 30 September | 30 March |
October half birthdays
October birthdays have half birthdays in April. April has 30 days, so a 31 October birthday moves to 30 April.
| Birthday | Half birthday |
|---|---|
| 1 October | 1 April |
| 2 October | 2 April |
| 3 October | 3 April |
| 4 October | 4 April |
| 5 October | 5 April |
| 6 October | 6 April |
| 7 October | 7 April |
| 8 October | 8 April |
| 9 October | 9 April |
| 10 October | 10 April |
| 11 October | 11 April |
| 12 October | 12 April |
| 13 October | 13 April |
| 14 October | 14 April |
| 15 October | 15 April |
| 16 October | 16 April |
| 17 October | 17 April |
| 18 October | 18 April |
| 19 October | 19 April |
| 20 October | 20 April |
| 21 October | 21 April |
| 22 October | 22 April |
| 23 October | 23 April |
| 24 October | 24 April |
| 25 October | 25 April |
| 26 October | 26 April |
| 27 October | 27 April |
| 28 October | 28 April |
| 29 October | 29 April |
| 30 October | 30 April |
| 31 October | 30 April |
November half birthdays
November birthdays have half birthdays in May on the same day.
| Birthday | Half birthday |
|---|---|
| 1 November | 1 May |
| 2 November | 2 May |
| 3 November | 3 May |
| 4 November | 4 May |
| 5 November | 5 May |
| 6 November | 6 May |
| 7 November | 7 May |
| 8 November | 8 May |
| 9 November | 9 May |
| 10 November | 10 May |
| 11 November | 11 May |
| 12 November | 12 May |
| 13 November | 13 May |
| 14 November | 14 May |
| 15 November | 15 May |
| 16 November | 16 May |
| 17 November | 17 May |
| 18 November | 18 May |
| 19 November | 19 May |
| 20 November | 20 May |
| 21 November | 21 May |
| 22 November | 22 May |
| 23 November | 23 May |
| 24 November | 24 May |
| 25 November | 25 May |
| 26 November | 26 May |
| 27 November | 27 May |
| 28 November | 28 May |
| 29 November | 29 May |
| 30 November | 30 May |
December half birthdays
December birthdays have half birthdays in June. June has 30 days, so a 31 December birthday moves to 30 June.
| Birthday | Half birthday |
|---|---|
| 1 December | 1 June |
| 2 December | 2 June |
| 3 December | 3 June |
| 4 December | 4 June |
| 5 December | 5 June |
| 6 December | 6 June |
| 7 December | 7 June |
| 8 December | 8 June |
| 9 December | 9 June |
| 10 December | 10 June |
| 11 December | 11 June |
| 12 December | 12 June |
| 13 December | 13 June |
| 14 December | 14 June |
| 15 December | 15 June |
| 16 December | 16 June |
| 17 December | 17 June |
| 18 December | 18 June |
| 19 December | 19 June |
| 20 December | 20 June |
| 21 December | 21 June |
| 22 December | 22 June |
| 23 December | 23 June |
| 24 December | 24 June |
| 25 December | 25 June |
| 26 December | 26 June |
| 27 December | 27 June |
| 28 December | 28 June |
| 29 December | 29 June |
| 30 December | 30 June |
| 31 December | 30 June |
Half birthday chart questions
When is my half birthday if I was born in August?
In February, on the same day of the month. Birthdays on 29, 30 and 31 August have their half birthday on 28 February, or 29 February in a leap year.
When is my half birthday if my birthday is in June?
In December, on the same day. For example, 13 June becomes 13 December.
What is the half birthday of 31 March?
30 September, because September has only 30 days.
Does my half birthday change every year?
No. It stays on the same date every year. The only exception is birthdays on 29, 30 or 31 August, which move to 29 February in leap years.
What day of the week is my half birthday?
It changes every year. Enter your birthday in the half birthday calculator to see the day of the week for your next half birthday.
Related pages
Last updated: 4 November 2026.