Whats The Difference Between 40d and 30d Lashes

Eyelash extensions have become increasingly popular in recent years, offering individuals the opportunity to enhance their natural lashes for a more dramatic and voluminous look. However, with various options available in the market, understanding the differences between different types of lashes, such as 40d and 30d lashes, is essential for making the right choice based on individual preferences and needs.

Understanding Lash Measurements

Before delving into the differences between 40d and 30d lashes, it’s crucial to understand what the “d” in lash measurements signifies. In the context of eyelash extensions, the “d” stands for diameter, indicating the thickness or diameter of each lash fiber. The higher the number preceding the “d,” the thicker the lashes.

Difference Between 40d and 30d Lashes

Length and Thickness Comparison

40d lashes are thicker and more voluminous compared to 30d lashes. They typically have a diameter of 0.20mm or higher, providing a bolder and more dramatic appearance. In contrast, 30d lashes are slightly thinner, with a diameter ranging from 0.15mm to 0.20mm, offering a more natural look with added length and definition.

Appearance and Volume

Due to their thicker diameter, 40d lashes offer significantly more volume and density than 30d lashes. They create a fuller and more intense lash look, making them ideal for individuals seeking a glamorous and eye-catching effect. On the other hand, 30d lashes provide a softer and more subtle enhancement, suitable for those preferring a more understated and natural appearance.

Durability and Maintenance

While both 40d and 30d lashes are made from high-quality synthetic fibers, the thicker diameter of 40d lashes may result in slightly heavier extensions. As a result, they may require more frequent touch-ups and maintenance to ensure optimal retention and comfort. Conversely, 30d lashes are lightweight and easier to maintain, offering a balance between durability and ease of upkeep.

Suitability for Different Eye Shapes and Preferences

The choice between 40d and 30d lashes depends on individual preferences, eye shape, and desired lash look. Those with larger eyes or a preference for bold, statement-making lashes may opt for 40d extensions for maximum impact. Conversely, individuals with smaller or hooded eyes may prefer the more natural appearance offered by 30d lashes for a subtle yet flattering enhancement.

Cost Comparison

In terms of cost, 40d lashes are generally priced higher than 30d lashes due to their thicker diameter and increased volume. The additional material required to create a fuller lash look contributes to the higher price point of 40d extensions. However, the investment in 40d lashes may be worthwhile for those seeking a dramatic and long-lasting lash enhancement.


The primary differences between 40d and 30d lashes lie in their thickness, appearance, and volume. While 40d lashes offer a bold and glamorous look with enhanced volume and density, 30d lashes provide a softer and more natural enhancement.

Understanding these distinctions can help individuals make an informed decision when choosing the most suitable lash extensions for their desired looks and preferences.


Are 40d lashes suitable for everyday wear?

While 40d lashes provide a dramatic look, they may be too bold for everyday wear for some individuals. However, it ultimately depends on personal preferences and style preferences.

Do 30d lashes require less maintenance compared to 40d lashes?

Yes, 30d lashes are generally easier to maintain due to their lighter weight and more natural appearance. However, both types of lashes require regular upkeep to ensure longevity and retention.

Can I mix 40d and 30d lashes for a customized lash look?

Yes, mixing different lash diameters allows for customization and versatility in achieving the desired lash look. Consulting with a professional lash technician can help determine the best combination for your individual needs.

Are 40d lashes suitable for individuals with sensitive eyes?

Individuals with sensitive eyes may find 30d lashes more comfortable due to their lighter weight and softer appearance. However, it’s essential to consult with a lash technician to assess any potential allergic reactions or sensitivities.

How long do 40d and 30d lashes typically last before requiring a refill?

The longevity of lash extensions depends on various factors, including individual lash growth cycle, maintenance routine, and lifestyle. On average, both 40d and 30d lashes can last between 2 to 4 weeks before needing a refill.

Leave a Comment