List of British monarchs by longevity

This is a list of British monarchs by longevity since the Union of the Crowns of England, Scotland and Ireland in 1603. To maintain consistency within the table, the dates of birth and death for each monarch are given in New Style. Two measures of the longevity are given—this is to allow for the differing number of leap days occurring within the life of each monarch. The first column is the number of days between date of birth and date of death, allowing for leap days; the second column breaks this number down into years, and days, with the years being the number of whole years the monarch lived, and then days after their last birthday. Elizabeth II is the longest lived British sovereign.

Rank	Monarch	Life Dates		Lifespan
Birth	Death	Days	Longevity
1	Elizabeth II	21 April 1926	–	34,625	94 years, 291 days*
2	Victoria	24 May 1819	22 January 1901	29,828	81 years, 243 days
3	George III	4 June 1738	29 January 1820	29,823	81 years, 239 days
4	Edward VIII	23 June 1894	28 May 1972	28,463	77 years, 340 days
5	George II	10 November 1683	25 October 1760	28,108	76 years, 350 days
6	William IV	21 August 1765	20 June 1837	26,235	71 years, 303 days
7	George V	3 June 1865	20 January 1936	25,797	70 years, 231 days
8	Edward VII	9 November 1841	6 May 1910	25,014	68 years, 178 days
9	James II and VII	24 October 1633	16 September 1701	24,798	67 years, 327 days
10	George IV	12 August 1762	26 June 1830	24,789	67 years, 318 days
11	George I	7 June 1660	22 June 1727	24,485	67 years, 15 days
12	James VI and I	19 June 1566	27 March 1625	21,466	58 years, 281 days
13	George VI	14 December 1895	6 February 1952	20,507	56 years, 54 days
14	Charles II	8 June 1630	6 February 1685	19,977	54 years, 253 days
15	William III and II	14 November 1650	19 March 1702	18,752	51 years, 125 days
16	Anne	16 February 1665	12 August 1714	18,073	49 years, 177 days
17	Charles I	29 November 1600	9 February 1649	17,604	48 years, 72 days
18	Mary II	10 May 1662	7 January 1695	11,930	32 years, 242 days

*Updated daily according to UTC.
While Queen Victoria lived for only 4 days more than George III in terms of years and days format, she actually lived for five days more because there were 20 leap days during Victoria's life and only 19 leap days during the life of George III.

If Charles, Prince of Wales, were to accede to the throne, he would immediately be ranked in 6th place with an age of 72 years, 84 days. If his son, William, Duke of Cambridge, were to accede any time before September 2030, he would be ranked between Charles I and Mary II.