Letters to Numbers Converter | A1Z26, T9, ASCII, Hex, and Binary

You type a word. It becomes numbers. That's the whole idea — and it's more useful than it sounds.

The letters to numbers converter at CalcyMate handles the conversion instantly — choose your encoding method, select your alphabet, enter your text, and get the complete encoded output in one step. No manual counting through the alphabet. No calculation errors.

What Is a Letter?

A letter is a written symbol representing a speech sound — the smallest unit of written language. The English alphabet contains 26 letters (A through Z), divided into:

• Vowels — A, E, I, O, U

• Consonants — all remaining 21 letters

Each letter has a fixed position in the alphabet — and that position is exactly what letter-to-number converters use to encode text.

Related terms:

• Character — a single alphabet symbol

• Symbol — a written mark representing a sound or concept

• Cipher — a system for encoding letters as numbers or other symbols

What Are Numbers?

Numbers are mathematical concepts used to count, measure, label, and quantify. In the context of letter-to-number conversion, numbers represent the positional value of each letter in the alphabet.

Key number types relevant to encoding:

• Natural Numbers — counting numbers starting from 1, 2, 3... (used in A1Z26 encoding)

• Whole Numbers — natural numbers including zero (0, 1, 2, 3...) (used in A0Z25 encoding)

• Integers — whole numbers and their negative counterparts (...−2, −1, 0, 1, 2...)

How to Convert Letters to Numbers — The Encoding Methods

A1Z26 Encoding (Most Common)

The standard system where:

• A = 1, B = 2, C = 3 ... Z = 26

This is the most widely used method — every letter maps to its natural alphabetical position starting from 1.

A0Z25 Encoding (Calculator Default)

The zero-based system where:

• A = 0, B = 1, C = 2 ... Z = 25

This is the default encoding method in the calculator — same as A1Z26 but shifted down by 1.

Quick Comparison

How the Letters to Numbers Converter Works

Inputs

• Text field — type any word, phrase, or sentence (e.g., "Hello world")

• Encoding method — select from dropdown:

  • A=0, B=1, C=2... (A0Z25) — default

  • A=1, B=2, C=3... (A1Z26)

  • Additional methods available

• Alphabet — select Latin (default) or other supported alphabets

Output — Encoded Result

The calculator outputs the number sequence for your entire input:

"Hello world" → 7 4 11 11 14 0 22 14 17 11 3

(Using A0Z25 encoding, Latin alphabet, spaces = 0)

How to Convert Letters to Numbers — Step by Step

Example 1 — "Hello world" in A0Z25

Using A=0, B=1, C=2... Z=25:

Result: 7 4 11 11 14 0 22 14 17 11 3 ✅ Matches calculator output exactly

Example 2 — "CAT" in A1Z26

Using A=1, B=2, C=3...

Result: 3 1 20

This is also how the word "CAT" looks in the A1Z26 cipher — one of the most commonly used letter substitution systems in puzzles, codes, and cryptography.

Example 3 — Numbers Back to Letters (Reverse)

The converter also works in reverse — numbers to letters:

7 4 11 11 14 → H E L L O (A0Z25) 8 5 12 12 15 → H E L L O (A1Z26)

The same sequence means different letters depending on which encoding method you use — always confirm your method before decoding.

Full Alphabet Reference — A0Z25 and A1Z26

Bookmark this table — it covers both encoding methods in one reference.

Fun Fact That'll Make You Laugh 😄

The A1Z26 cipher — where A=1, B=2, C=3 — is so simple that it was reportedly used by Julius Caesar's enemies to mock how basic his encryption was.

Caesar himself used a letter-shift cipher (not number substitution) — but the A1Z26 system became the "beginner cipher" that every schoolkid discovers independently when they first learn about secret codes.

Thousands of years of cryptography evolution and the most popular online encoder is still just... counting the alphabet. 😂

Frequently Asked Questions

How can I convert a letter into a number?

Find the letter's position in the alphabet. Using A1Z26: A=1, B=2... Z=26. Using A0Z25: A=0, B=1... Z=25. Count manually or use a letters to numbers converter online to encode entire words and sentences instantly without counting through the alphabet yourself.

How do I call numbers that are written with letters?

Numbers written as words are called cardinal numbers (one, two, three) or ordinal numbers (first, second, third). In cryptography and encoding, letters converted to their positional numbers are called ciphertext or encoded values — not the same as writing numbers as words.

How does the word "CAT" look in A1Z26 cipher?

In the A1Z26 cipher (A=1, B=2... Z=26): C=3, A=1, T=20. So CAT = 3 1 20. This is one of the most commonly used examples in basic cryptography because it's short, easy to verify, and covers three very different letter positions in the alphabet.

How do I convert letters to binary?

First convert each letter to its A1Z26 number, then convert that number to binary. Example: A = 1 = 00000001 in binary. B = 2 = 00000010. Or use ASCII values directly — A = 65 = 01000001 in binary. The letters to numbers converter handles the first step; a binary converter handles the second.