List of important maths days
- E-Day (Eulers Number)
- Fibonacci Day
- International Sudoku Day
- National Mathematics Day (India)
- National Numeracy Day (UK)
- Number Day (UK)
- Palindrome Day
- Pi Day
- Pythagorean Theorem Day
- Square Root Day
- Women in Mathematics Day
- World Maths Day
1. E-Day (Eulers Number)
E-day is celebrated to celebrate the mathematical constant e, which is called as Euler's Number and has a value
of 2.7182818.
It is celebrated on 7th of February every year. The date is chosen from the the first two digits of the
Euler's Number i.e. from 2.7, where is 2 for february and 7 kept for date.
2. Fibonacci Day
Fibonacci Day is celebrated on 23rd of November every year. It is celebrated to honour Italian mathematician
Leonardo Bonacci, the most talented Western Mathematician of the Middle Ages.
He is also known as Leonardo of Pisa and Leonardo Fibonacci. He introduced Europe to the Hindu-Arabic numeral
system to ease the calculations with numbers unlike Roman numerals.
He introduced one of the most influential sequence of numbers called as Fibonacci Numbers, which further
derives a unique ratio in mathematics, called as "Golden Ratio".
Surprisingly, Golden ratio can describe many phenomenon of nature to financial markets.
Fibonacci day is celebrated on 23rd November every year and the date 11/23 is selected because the digits in
11/23 makes the part of Fibonacci sequence i.e. 1, 1, 2, 3.
3. International Sudoku Day
International Sudoku Day is celebrated every year on September 9. The number 9 has been taken from the sudoku game that is played on 9 x 9 grid. On this day sudoku competitions are held and winner is declared who completes the sudoku puzzle te fastest. The day September 9 was officially declared by The World Puzzle Federation in 2013.
4. National Mathematics Day (India)
National Mathematics Day is celebrated in India on 22 December every year which is the birth anniversary of
famous mathematician
Srinivasa Ramanujan.
Srinivasa Ramanujan was an Indian mathematician who contributed to number theory, infinite
series and continued fractions in his short span of life only.
He was the youngest to receive Fellows of the Royal Society and elected as Fellow of Trinity
College, Cambridge.
5. National Numeracy Day (UK)
National Numeracy Day is celebrated every year in the month of may in United Kingdom. Dates are announced by National Numeracy organisation. It was started in the year of 2018 by the National Numeracy organisation. They will conduct a Number Heroes Competition with a chance to win prizes for individuals. nurseries, schools or even youth groups.
Sign up for National Numeracy Day
6. Number Day (UK)
Number Day is celebrated in UK and is organised by the NSPCC charity who works for children to prevent abuse, help rebuild children's lives and support families. In 2026, this will fall on 6 February.
Number Day is a fundraising math activities event which is free to join for children, nursery and schools and is the day is filled up with various game shows, current trends, tasks and teamwork from the participants.
7. Palindrome Day
Palindrome Day is the day of the year which makes same pattern like Palindrome. Palindrome is word or a number
which can be read in both forward and backward directions and reading in both directions makes the same word or
the number.
For a day to be a palindrome it must be in a format of mm/dd/yyyy or mm/dd/yy.
In 2026, the Palindrome days will start from 22/06/2026 to 29/06/2026.
22 June, 2026
We can write it as 6/22/26 in m/dd/yy format.
The number sequence is 62226 in forward direction (left to right).
And, number sequence is 62226 in backward direction (right to left).
So, it is a palindrome because the number 62226 comes out to be same if read in either direction, which
makes 6/22/26 as a palindrome day.
List of Palindrome Days in 2026
| Date | Number in forward direction | Number in backward direction |
|---|---|---|
| June 22, 2026 (6/22/26) | 62226 | 62226 |
| June 23, 2026 (6/23/26) | 62326 | 62326 |
| June 24, 2026 (6/24/26)) | 62426 | 62426 |
| June 25, 2026 (6/25/26) | 62526 | 62526 |
| June 26, 2026 (6/26/26) | 62626 | 62626 |
| June 27, 2026 (6/26/27) | 62726 | 62726 |
| June 28, 2026 (6/28/26) | 62826 | 62826 |
| June 29, 2026 (6/29/26) | 62926 | 62926 |
8. Pi Day
Pi is the most famous number and a mathematical constant, which has a value of 3.142. It is observed on 14 March
of every year. It is also known by the name of International Day of Mathematics from November, 2019 onwards.
The official website of International Day of Mathematics is
The International Day of Mathematics (IDM).
It is observed on 3/14 because the three digits 3, 1 and 4 makes the first 3 numbers of Pi value.
To celebrate the upcoming International Day of Mathematics in the year 2026, the International Mathematical Union announced the theme Mathematics, Art, and Creativity. You can organize and decorate your own event to celebrate it.
9. Pythagorean Theorem Day
Pythagorean Theorem Day is celebrated all over the world to celebrate the famous theorem of Geometry Pythagoras
Theorem. The date of celebration is calculated using the Pythagoras formula.
We know the Pythagoras formula states that the sum of squares of perpendicular and base is equal to the square
of the hypotenuse.
The date of celebration in a year falls on the day when the sum of squares of date and month equals the square
of the last two digits of the year.
Pythagorean Theorem Day in year 2017 was 15 August, 2017. Let's see how it is calculated.
Date = 15
Month = 8
Last two digits of year 2017 = 17
∴ 152 + 82 = 225 + 64 = 289
also, 172 = 289
So, for 15 August, 2017, sum of squares of 15 and 8 is equal to square of 17.
This is how the date is calculated for Pythagorean Theorem Day.
The next Pythagorean Theorem Day in the future falls on 24 October, 2026.
10. Square Root Day
Square Root Day is the rarest mathematics day because it cannot be celebrated every year. Surprisingly, its
occurrence is only 9 times in one century.
It is celebrated on the days when both date and month are the square root values of the last two digits of
the year.
It was started by Ron Gordon, a high school teacher from Redwood City, California on September 9, 1981
(9/9/81).
The last square root day celebrated was on 5 May, 2025 (5/5/25). The next upcoming Square Root Day is 6
June, 2036 (6/6/36).
Let's take an example of square root day and see how it is calculated.
February 2, 2004 (2/2/04)
day = 2, month = 2, year = 04
day = 2 = √4
month = 2 = √4
So, square root of year 04 is equal to both day 02 and month 02 of 2/2/04
List of Square Root Days
| Date | Day | Month | Year | Square root of year |
|---|---|---|---|---|
| January 1, 2001 (1/1/01) | 1 | 1 | 1 | √1 = 1 |
| February 2, 2004 (2/2/04) | 2 | 2 | 4 | √4 = 2 |
| March 3, 2009 (3/3/09) | 3 | 3 | 9 | √9 = 3 |
| April 4, 2016 (4/4/16) | 4 | 4 | 16 | √16 = 4 |
| May 5, 2025 (5/5/25) | 5 | 5 | 25 | √25 = 5 |
| June 6, 2036 (6/6/36) | 6 | 6 | 36 | √1 = 6 |
| July 7, 2049 (7/7/49) | 7 | 7 | 49 | √49 = 7 |
| August 8, 2064 (8/8/64) | 8 | 8 | 64 | √64 = 8 |
| September 9, 2081 (9/9/81) | 9 | 9 | 81 | √81 = 9 |
11. Women in Mathematics Day
Women in Mathematics Day is celebrated worldwide on 12th of May every year.
It is the day to celebrate for women in mathematics for their achievements in the field of mathematics and
to encourage to an open, welcoming and inclusive environment for everybody.
The events to celebrate the day take place from 1 May to 15 June.
May 12 Initiative is the website whose goal is to
inspire
women everywhere in the world to celebrate their achievements in mathematics and to encourage an open, welcoming
and
inclusive work environment for everybody.
12. World Maths Day
World Maths Day is a global celebration of mathematics where millions of students aged 5 to 18
across
the world compete in Live Mathletics challenges.
It's free and open to schools all over the world. Any student aged from 5 to 18 years can participate and win
the prizes.
If you would like to know when it will be celebrated in this year or interested to know how it works, what to
do on the day and download World Maths Day Handbook, please visit
World Maths
Day by 3P Learning website.
Summary of maths days in a year
| S.N. | Name | When? |
|---|---|---|
| 1. | E-Day (Eulers Number) | 7th of February every year |
| 2. | Fibonacci Day | 23rd of November every year |
| 3. | International Sudoku Day | 9th of September every year |
| 4. | National Mathematics Day (India) | 22 of December every year |
| 5. | National Numeracy Day (UK) | May month every year |
| 6. | Number Day (UK) | Not a fixed date |
| 7. | Palindrome Day | Not a fixed date |
| 8. | Pi Day | 14th of March every year |
| 9. | Pythagorean Theorem Day | Not a fixed date |
| 10. | Square Root Day | Occurs 9 times only in one century |
| 11. | Women in Mathematics Day | 12th of May every year |
| 12. | World Maths Day | Not a fixed date |
2026 Calendar of Math days
| Name of Math day | Date |
|---|---|
| E-Day (Eulers Number) | 07-02-2026 |
| Number Day (UK) | 06-02-2026 |
| Pi Day | 14-03-2026 |
| Women in Mathematics Day | 12-05-2026 |
| National Numeracy Day (UK) | 20-05-2026 |
| Palindrome Day | 22-06-2026 to 29-06-2026 |
| Pythagorean Theorem Day | 24-10-2026 |
| International Sudoku Day | 09-09-2026 |
| Fibonacci Day | 23-11-2026 |
| National Mathematics Day (India) | 22-12-2026 |
Frequently Asked Questions
1) When is Pi Day celebrated?
Pi day is celebrated every year to celebrate the mathematical constant pi (π) which has value of 3 .14159265359 and 3.14 when rounded off to two decimal places. The day of observance of pi day is March 14 because 14 (date) and 3(month) occur in the value of pi which is 3.14.
2) When is Pythagoras Theorem Day celebrated?
Pythagoras Theorem Day is also know by name of Pythagorean Theorem Day. It is celebrated in the year which has sum of squares of dates and month equal to square of last two digits of the year. The next Pythagoras Day in the future will fall on 24-10-2026.
3) When is the upcoming National Numeracy Day in 2026 in UK?
The upcoming National Numeracy Day in 2026 is on 20-05-2026.
