What Is Product Attach Rate? Formula and How to Raise It

Product attach rate is the percentage of orders that include at least one add-on product, such as an order bump, upsell, or bundle item. You calculate it by dividing orders with an add-on by total orders, then multiplying by 100.

Quick answer: Attach rate measures how often buyers say yes to a second product. It is one of the cheapest ways to grow revenue because it uses buyers you already paid to get. SamCart has processed more than $8B in sales, and its data shows that adding a single upsell can lift Day 1 average order value by 42%.

What is product attach rate?

Product attach rate is the share of orders where the buyer added something beyond the main product. If 100 people buy your course and 25 also add a workbook, your attach rate is 25%.

The add-on can be:

• An order bump: a low-cost item offered with one checkbox on the checkout page

• A one-click upsell: an offer shown right after purchase

• A bundle or second product bought in the same session

Attach rate is a core metric in The Business Math. Traffic costs money. A second sale to the same buyer does not.

How do you calculate attach rate?

Attach rate = (orders with at least one add-on ÷ total orders) × 100

Worked example

• Total orders this month: 500

• Orders that included an add-on: 140

• Attach rate: 140 ÷ 500 × 100 = 28%

Now the revenue side. Say your main product is $97 and your order bump is $27.

That is $945 more from the same 500 buyers. No new traffic. No new ads.

Order-level vs. offer-level attach rate

• Order-level attach rate counts any order with any add-on. Use it to track your whole offer stack.

• Offer-level attach rate (often called take rate) tracks one offer, like a single bump. Use it to find which offer to fix.

Track both. Order-level tells you if the stack works. Offer-level tells you where it breaks.

Attach rate vs. average order value: what is the difference?

Attach rate tells you how often buyers add more. Average order value (AOV) tells you how much the average order is worth. They move together, but they are not the same.

Here is why you need both. One seller gets 10% of buyers to add a $197 product. Another gets 40% to add a $49 product. Their AOV lift is nearly the same, about $20 per order. But the second seller has an offer most buyers want, and the first has an offer most buyers skip. Attach rate shows you that. AOV alone does not.

For AOV tactics, see How to Increase Average Order Value.

What is a good attach rate?

There is no single benchmark that fits every product. Attach rate depends on your price, your add-on, and where you show the offer. A good attach rate is one that beats your own baseline month over month.

Start by measuring the last 30 days. Then improve one offer at a time.

How do I increase my product attach rate?

Use these five steps. Each one builds on the last.

1. Make the add-on finish the job. The best add-ons help buyers get results from the main product faster. Think templates, checklists, swipe files, or a bonus module. If the add-on feels random, buyers skip it.

2. Put the first offer on the checkout. An order bump asks for one click while the buyer is already paying. There is no extra page and no extra step. Full guide: The Complete Guide to Order Bumps.

3. Add one offer after purchase. A one-click upsell runs right after checkout with no card re-entry. Start with one upsell, not a long funnel. More plays: Upsell Strategies.

4. Price the add-on below the main product. A bump that costs a fraction of the main product is an easy yes. Save higher-priced offers for the upsell.

5. Test one thing at a time. Test the bump headline or the bump price, not both. Track offer-level take rate so you know which change worked.

How SamCart helps you raise attach rate

SamCart is the AI execution layer for digital product sellers. It writes and builds your pages, then runs the offers that turn one sale into two.

• Order bumps on the checkout page, one checkbox

• One-click upsells and downsells after purchase, no card re-entry

• A/B testing on pages and offers

• Pages AI to build and launch new offer pages fast

See all SamCart features, or compare tools in The Best Checkout Software for Digital Products in 2026.

The bottom line

Attach rate tells you if buyers want more from you. Measure it, add one bump and one upsell, and test from there. Every point you add is revenue from buyers you already have.

Start your SamCart trial and add your first order bump today.