numbers on hair dye

Numbers Game: Mastering Hair Dye Shades

By Hannah AndersonDecember 3, 2025

Ever wondered about those numbers displayed on the back of your hair dye packaging? They're not there to confuse you—they're a helpful guide to ensure you get the perfect color every time. Let's decode these numbers together and transform your hair dyeing experience.

Hair dyes use a color chart system with numbers that correspond to different shades. These numbers are an international standard, making it easier to choose the right color whether you're shopping in your local drugstore or online. But what do they actually mean?

Understanding the Number System

The number system for hair dyes can be broken down into two main components: the first number (color level) and the second number (tone or shade).

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Let's dive deeper into understanding these components.

Color Level

The first number signifies the color level, which ranges from 1 (black) to 10 (platinum blonde). For dark hair colors, a higher number means lighter shades. For lighter hair colors, a higher number means darker shades.

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For instance, if you're looking to go from black (level 1) to light blonde (level 9 or 10), you'll notice that the progression goes in the opposite direction for the first set of numbers compared to the second.

Tone or Shade

The second number signifies the tone or shade of the color. It ranges from 0 (red cast) to 10 (ash/cool cast) or 11 (neutral/natural). A lower number indicates a warmer, redder tone, while a higher number indicates a cooler, ashier tonality.

For example, if the level is 7 (light brown), a 1 or 2 in the second number will give you a warm tone (blonde with red undertones), while a 7 will give you a neutral tone, and a 9 will give you a cool tone (ash blonde).

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Choosing the Right Number Combination

Having a basic understanding of the color level and tone can help you choose the right hair dye for you. However, it's essential to consider other factors like your natural hair color, current hair condition, and desired outcome.

It's also crucial to remember that these numbers are a guideline. Due to variables like previous hair dye jobs, hair porosity, and overall health, results may vary. Always do a strand test before committing to a full dye job.

Determining Your Current Level and Tone

Hair dye manufacturers often provide a chart showing the level and tone of various colors. You can use this to determine your current level and tone, helping you choose the right dye for your next session.

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Hair Color Numbers Explained: What They Mean + How to Use Them

Additionally, many dyes come with a color matcher tool. Simply order the hair dye in your current color, apply it to a small section of hair, and match the result to the color matcher tool to find your perfect shade.

Experimenting with hair dye numbers can be a fun way to switch up your look. Just remember to expect some trial and error, and always prioritize the health of your hair. Happy dyeing!