How many days are in a year?

A year has 365 days, and a leap year has 366. The next leap year is 2028.

The leap year rule from the Calendar (New Style) Act 1750.

2026 is not a leap year, so it has 365 days.

Show the workings

Step	Sum	Answer
Not a leap year	2026 does not divide by 4	365 days

A leap year comes every this many years: 4 years. Source: Calendar (New Style) Act 1750, section 2. Checked 14 November 2026.
Hundredth years are common years, not leap years: 100 years. Source: Calendar (New Style) Act 1750, section 2. Checked 14 November 2026.
Except every fourth hundredth year, which is a leap year: 400 years. Source: Calendar (New Style) Act 1750, section 2. Checked 14 November 2026.
Days in a common year: 365 days. Source: Calendar (New Style) Act 1750, section 2. Checked 14 November 2026.

The leap year rule

The law that set up the calendar used in Great Britain, the Calendar (New Style) Act 1750, sets the rule:

A year that divides by 4 is a leap year, with 366 days.
But a hundredth year, one that divides by 100, is not.
Except every fourth hundredth year, one that divides by 400, which is a leap year after all.

So 2024 and 2028 are leap years, 1900 was not and 2100 will not be, but 2000 was.

Leap years

Rule checked 14 November 2026 at legislation.gov.uk.

How many weeks are in a year?
52 weeks and a day or two, and which years have 53 week numbers.
Days between dates calculator
How many days, weeks, months and years there are from one date to another.
What week number is it?
Today's week number, and the week number of any date, the ISO 8601 way.