When we talk about onion sizes, we are referring to one of the main characteristics used to classify, select, and market this product, allowing onions to be grouped according to their size and diameter, and facilitating both order preparation and distribution, packaging, and market destination.
In the produce sector, onion grading is a fundamental process for ensuring consistent batches tailored to each customer’s needs. After all, not all onions are the same size, nor are they intended for the same uses; therefore, understanding the differences between sizes is particularly important for food industry professionals, distributors, wholesalers, and consumers alike.
At Cebollas Aparici, we work with different onion sizes and formats to meet our customers’ needs and the specific requirements of each market.
What are onion sizes?
An onion’s size refers to its dimensions, determined primarily by the maximum diameter of the bulb’s equatorial section. Simply put, the larger the onion’s diameter, the larger its size.
Sizing allows onions of similar dimensions to be grouped together in a single batch. This ensures greater uniformity in the product being sold, which is particularly important in the sorting, packaging, distribution, and export processes.
In Spain, onion sizes have traditionally been expressed using numerical intervals associated with diameter. In international trade, it is also common to work directly with ranges expressed in millimeters.
Main onion sizes
To go into more detail, the most common onion sizes used in the market include:
| Size | Approximate Diameter |
| Large | 100 mm or more |
| 90 | 90–110 mm |
| 80 | 80–100 mm |
| 70 | 70–90 mm |
| 60 | 60–80 mm |
| 50 | 50–70 mm |
| 40 | 40–60 mm |
| Small | 30–45 mm |
These ranges may vary depending on market specifications, customer requirements, or the grading system used.
In export operations, it is common to adjust the size grading of onions to meet the specifications requested by each buyer. Among the most common size ranges expressed in millimeters are 40–60 mm, 50–70 mm, 60–80 mm, 70–90 mm, and 80–100 mm.
Differences among onion sizes
The main difference among onion sizes is the size of the bulb. However, size can also influence the choice of product depending on its intended use.
Larger-diameter onions are often preferred when a larger bulb is needed for specific cooking methods or presentation styles. In contrast, medium sizes offer great versatility and are commonly found in many retail channels.
On the other hand, smaller sizes may be suitable for preparations that call for whole onions or a specific presentation.
It is important to note that size alone does not determine the quality of an onion. Size is a commercial characteristic, while factors such as firmness, the condition of the outer layers, the absence of rot, proper storage, and the variety-specific characteristics are also key factors in evaluating the product.
Large-size onions
Larger onions have a large diameter and can exceed 100 mm.
This size can be particularly useful for certain applications in the hospitality, restaurant, and professional kitchen sectors, where there is a need for a large bulb that yields a sufficient amount per unit.
They can also be used in preparations where the onion is sliced, cut into rings, or prepared in other ways.
Medium-sized onions
Onions ranging in size from approximately 50 to 90 mm make up a significant portion of the varieties sold. Their size offers great versatility, which is why they can be found in various distribution channels and culinary applications.
Within these ranges, there are various selection options, such as 50–70 mm, 60–80 mm, or 70–90 mm, depending on customer needs.
Small onion sizes
Smaller-diameter sizes allow for the marketing of small onions and can be particularly useful for certain culinary preparations and presentations.
In this case, the uniformity of the batch becomes especially important when the product is to be sold by the piece or used whole.
How are onions sized?
Sizing is an essential step in the onion selection and packaging process.
To determine the size, the maximum diameter of the bulb’s equatorial cross-section is used as a reference. Based on this measurement, the onions are grouped into the corresponding size range
On a professional processing line, the sorting process may combine different classification and inspection systems to ensure homogeneous batches and meet established commercial specifications.
The goal is not merely to separate onions by size. The sorting process also allows for the inspection of other aspects related to the product’s quality, appearance, and condition.
Are some onion sizes better than another?
The answer to the question of whether one onion size is better than another is no. The choice depends on the intended use, the commercial format, customer preferences, and the characteristics of the target market.
A 40–60 mm onion and an 80–100 mm onion serve different commercial purposes, but that does not mean one is necessarily of higher quality. Therefore, when placing a professional order, in addition to specifying the variety and quality characteristics, it is important to specify the onion size needed.
How do you choose the right onion size?
Once you understand the differences between the various sizes, the choice will depend mainly on the product’s intended use. Therefore, to select the most appropriate size, you should consider the following:
- Culinary use: An onion intended to be used whole does not require the same size as one intended to be sliced, diced, or julienned.
- Marketing channel: Supermarkets, wholesalers, the hospitality industry, and the food industry may have different needs.
- Packaging format: Size can determine the number of units per package and the final presentation of the product.
- Customer specifications: In professional operations, especially for export, the buyer may specify a specific diameter range.
- Consistency: Working with onions of similar size facilitates handling and ensures a more uniform presentation.
Aparici Onions: Onion sizes tailored to every need
At Aparici Onions, we understand that each customer may require a specific size and format. That is why product selection and preparation are an essential part of our work.
Our product knowledge, selection process, and size control allow us to offer onions tailored to different commercial needs and markets.
If you need information about onion sizes, marketing formats, or supply options, please contact our team, we’d be happy to assist you.
