What Is the Significance of the Number 18 in Judaism?
Read aloud with an AI voice of Rabbi Fuchs, made with his permission.
The short answer: 18 is the gematria of chai (חי), the Hebrew word for life. Because charity saves from death, Jews give tzedakah in multiples of 18. It isn’t a lucky number; it’s a reminder of the power of giving.
There are several explanations, but one particularly meaningful explanation is connected to the idea of life and charity.
Charity saves from death
In Proverbs (10:2), King Solomon teaches us:
״וצדקה תציל ממות״
“Charity saves from death.”
Chai: why 18 means life
In Hebrew, every letter has a numerical value, a system known as gematria. The Hebrew word for life is חי (chai), which consists of two letters: ches, with a numerical value of 8, and yud, with a numerical value of 10. Together, they add up to 18.
This creates a beautiful connection between charity and life. Since charity has the power to save lives, and the number 18 represents life, it has become a Jewish custom to give charity in multiples of 18.
Is 18 a lucky number in Judaism?
Some people think of 18 as a lucky number. However, in Judaism, we don't believe that a number itself brings good luck. We believe that our blessings come from G-d.
And while the number 18 may not have magical powers, giving tzedakah (charity) certainly has spiritual significance. It is a powerful mitzvah that brings G-d's blessing and Divine assistance into our lives.
The real significance of 18
So the real significance of 18 is not that it brings good luck, but that it reminds us of the power of giving, and how giving to others can bring life and blessing into our own lives.
18 in Judaism: questions people ask
What does 18 mean in Judaism?
Eighteen is the gematria (numerical value) of chai, חי, the Hebrew word for “life.” The letter ches equals 8 and yud equals 10, so together they make 18.
Why is 18 important in Judaism?
Because it stands for life. King Solomon teaches that “charity saves from death” (Proverbs 10:2), so giving tzedakah is bound up with life, and it has become a Jewish custom to give charity in multiples of 18.
Why is 18 considered a lucky number in Judaism?
Many people call 18 lucky, but Judaism doesn’t teach that a number brings luck. Our blessings come from G-d. What 18 carries is a reminder: giving tzedakah is a powerful mitzvah that brings G-d’s blessing into our lives.
Why do Jews give money in multiples of 18?
Giving 18, 36 (“double chai”) or 180 ties the gift to life: 18 represents chai, and tzedakah has the power to save lives. It turns a donation into a small blessing for life.
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