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e-Day

Unlock the secrets of e with us on e-Day - explore the fascinating math constant and its implications for our world!

Sunday

February 2027

Last updated February 7, 2026 · by the Holiday Calendar Team

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YEARLY DATEFebruary 7

OBSERVED INUnited States

CATEGORYSchool

SUBCATEGORYSTEM

INTRO

Introduction

PHOTO

It's time to get your math on and celebrate e-Day (Math Constant) on Feb. 7! This day has been around since the early 1800s, when it was first discovered by Swiss mathematician Jacob Bernoulli. e is an irrational number that never ends or repeats itself, making it a unique mathematical constant. It has been used in many different equations and formulas throughout history, and is constantly being studied and researched to this day. So let's take a moment to appreciate its beauty, complexity, and mystery – e-Day is here!

TIMELINE

e-Day Timeline

Discovery of e

The mathematical constant "e" was first used in a publication by John Napier in his work on logarithms, though it was not named or detailed.

Recognition of e's Value

Though "e" is often attributed to Euler, its first use in calculus was likely by Jacob Bernoulli while studying compound interest.

Euler's Adoption of e

Leonhard Euler adopted the use of the letter "e" for the mathematical constant and did much to popularize it.

e's Definitive Calculation

“e” was definitively calculated to 127 decimal places by English mathematician John Wrench and American mathematician Levi Smith.

Computation of e

During the 2000s, e was computed to over two trillion digit places. This was a feat of computer computation rather than a necessary degree of accuracy.

Celebration of e-Day

On February 7 (2/7 in the American date format), math enthusiasts around the world celebrate e-Day, in honor of the mathematical constant.

GET INVOLVED

How to Celebrate e-Day

Learn about e

Take some time to learn about e and its significance in mathematics. Read up on the history, background, and importance of this mathematical constant.

PLAY

Play math games

Host a math game night with friends and family. Play games that involve using e in various ways such as calculating exponential growth or understanding the difference between logarithmic and linear equations.

CALCULATE

Calculate e

Challenge yourself by calculating e with various methods such as Taylor series or continued fractions. This can be both a fun and educational experience.

MAKE

Make an e craft

Create a craft related to e. It could be anything from a poster or painting to a model or sculpture. Be creative and have fun!

SOLVE

Solve e equations

Try your hand at solving equations involving e such as exponential growth or logarithmic functions. This can be a great way to show your appreciation of mathematics.

WHY THIS DAY MATTERS

Why We Love e-Day

It's easy to celebrate

Celebrating e-Day is incredibly simple - everyone can get involved! Whether you're plotting out equations or simply having fun with some fun math games, there's something for everyone to enjoy about this special day dedicated to mathematics!

E Day celebrates math and science

Not only is e-Day a great reminder to appreciate the beauty of mathematics and science, but it also serves as inspiration for those who are interested in entering the fields. The day honors important discoveries made in both disciplines and encourages exploration of their often complicated yet fascinating topics.

e is a constant

Mathematicians around the world have found that the number “e” is an incredibly powerful number. This mathematical constant appears in all sorts of equations, formulas, and calculations, making it one of the most important constants ever discovered.. This makes it a suitable symbol for celebrating everything math has to offer!

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