Calculate attachment ratio and find primary or secondary products sold when you enter any two values for retail sales analysis in stores.
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Attachment Ratio Formula
The attachment ratio measures how often a secondary product is sold along with a primary product. It is usually shown as a percentage.
- AR = attachment ratio as a percentage
- S = number of secondary products sold
- P = number of primary products sold
To calculate the number of secondary products sold, rearrange the formula:
To calculate the number of primary products sold, rearrange the formula:
- Calculate attachment ratio: Use this when you know the primary products sold and secondary products sold.
- Calculate secondary products sold: Use this when you know the primary products sold and the attachment ratio.
- Calculate primary products sold: Use this when you know the secondary products sold and the attachment ratio.
Attachment Ratio Benchmarks and Interpretation
Attachment ratio benchmarks vary by industry, product type, and sales process. The table below gives a general way to interpret the result.
| Attachment Ratio | General Interpretation | Example Meaning |
|---|---|---|
| 0% to 10% | Low attachment | Few buyers add the secondary product. |
| 10% to 30% | Moderate attachment | The secondary product is added sometimes. |
| 30% to 60% | Strong attachment | A significant share of buyers add the secondary product. |
| 60% or higher | Very high attachment | The secondary product is commonly sold with the primary product. |
The next table shows the relationship between primary product sales, attachment ratio, and expected secondary product sales.
| Primary Products Sold | Attachment Ratio | Secondary Products Sold |
|---|---|---|
| 100 | 10% | 10 |
| 100 | 25% | 25 |
| 250 | 20% | 50 |
| 500 | 40% | 200 |
Attachment Ratio Examples
Example 1: Calculate attachment ratio
You sold 400 primary products and 80 secondary products.
The attachment ratio is 20%.
Example 2: Calculate secondary products sold
You sold 750 primary products and have an attachment ratio of 12%.
The number of secondary products sold is 90.
Attachment Ratio FAQ
What does attachment ratio mean?
Attachment ratio means the percentage of primary product sales that also include a secondary product. For example, if 100 primary products are sold and 25 secondary products are sold, the attachment ratio is 25%.
Can an attachment ratio be over 100%?
Yes. An attachment ratio can be over 100% if more than one secondary product is sold per primary product. For example, if 100 primary products are sold and 140 secondary products are sold, the attachment ratio is 140%.
Is attachment ratio the same as conversion rate?
No. Attachment ratio compares secondary product sales to primary product sales. Conversion rate usually compares completed purchases, signups, or actions to total visitors, leads, or opportunities.
