Shopify Cart & Checkout Optimization: How to Increase Revenue with Both

Shopify cart and checkout optimization work together to increase your store’s revenue, yet most merchants fix only one side. This article explains the difference between the two, shows where your store loses money between “add to cart” and “order confirmed,” and gives you specific tactics for each stage with real data behind them. I am Allan Vu, Digital Marketing Executive at BOGOS, and I have spent years helping Shopify merchants turn more carts into completed, higher-value orders. This guide was written from that hands-on experience, supported by research from Baymard Institute and Shopify, and edited by our team with AI assistance.

TL;DR

• Cart abandonment averages 70.22% across 50 studies, so roughly 7 in 10 carts never convert (Baymard Institute).
• Cart optimization mostly increases average order value (AOV). Checkout optimization mostly recovers lost conversions.
• Store revenue equals traffic multiplied by conversion rate multiplied by AOV. The two optimizations move different parts of that formula.
• The top fixable reason for abandonment is extra costs shown too late, which affects 48% of shoppers (Baymard, via eMarketer).
• Better checkout design can lift conversion by up to 35.26% (Baymard Institute).
• Running both cart and checkout optimization compounds revenue instead of simply adding it.

1. What cart optimization and checkout optimization mean on Shopify

Cart optimization and checkout optimization are two separate jobs that fix two different revenue leaks. Cart optimization happens before the customer clicks “checkout.” Checkout optimization happens from the moment they click “checkout” until the order is confirmed.

Merchants confuse the two because both live at the end of the buying journey. The confusion costs money, because a fix that works in the cart does little inside the checkout, and the opposite is also true.

What cart optimization is

Cart optimization is the work of increasing the value and completion of the cart before checkout begins. It covers the cart page, the slide-out cart drawer, and any offer that appears there.

Common cart optimization tactics include free shipping progress bars, cart upsells, cross-sells, bundles, and trust messages. The main goal is to raise the average order value while keeping the shopper moving toward checkout.

What checkout optimization is

Checkout optimization is the work of removing friction between “checkout” and “order confirmed.” It covers the payment step, the forms, the shipping options, and the speed of the pages.

Common checkout optimization tactics include enabling Shop Pay, offering guest checkout, cutting form fields, showing the full cost early, and adding trust signals. The main goal is to recover shoppers who would otherwise abandon the purchase.

The key difference between them

The clearest difference is the stage each one targets and the metric each one moves. The table below shows this side by side.

2. How cart and checkout optimization increase revenue together

Cart and checkout optimization increase revenue by moving different parts of the same formula, so their results multiply. This is the single most important idea in this article.

The Shopify revenue formula

Store revenue equals traffic multiplied by conversion rate multiplied by average order value. You can grow revenue by improving any one of the three, and the cart-to-checkout flow controls two of them.

Cart optimization pushes the AOV number up. Checkout optimization pushes the conversion rate number up. Neither one needs extra traffic or ad spend.

Cart optimization grows average order value

Cart optimization grows AOV by encouraging shoppers to add more before they check out. The data on this is consistent across tactics.

Free shipping thresholds increase AOV by roughly 15% to 30%, and 58% of shoppers add items specifically to reach the threshold (Capital One Shopping research). Bundles are another strong lever, with industry data reporting AOV lifts of about 20% to 30% for stores that use them well. If AOV is the number you want to move, our full guide to Shopify AOV breaks down every tactic in detail.

Checkout optimization recovers lost conversions

Checkout optimization recovers conversions by removing the friction that makes shoppers quit at the payment step. The upside is large and well documented.

Baymard Institute found that fixing known checkout usability issues can raise conversion by up to 35.26% for large stores (Baymard Institute). On Shopify specifically, enabling Shop Pay delivers an average 9% conversion lift across all checkouts and an 18% higher conversion rate for returning customers (Shopify). For a wider view of the metric itself, see our guide to Shopify conversion rate.

Why doing both compounds

Doing both compounds because a percentage lift in conversion applies on top of a percentage lift in AOV. A worked example makes this clear.

Take a store with 50,000 monthly visitors, a 2% checkout conversion rate, and a $90 AOV. That store earns $90,000 per month, from 1,000 orders.

Checkout optimization that lifts conversion from 2% to 2.3% produces 1,150 orders. At the old $90 AOV, that is $103,500 per month, a 15% gain.

Cart optimization that lifts AOV from $90 to $99, with conversion unchanged, produces $99,000 per month, a 10% gain.

Running both at once produces 1,150 orders at $99 each, which is $113,850 per month. That is a 26.5% gain, not 25%, because the two lifts multiply rather than add. Over a year, that difference alone is worth $18,000 to this example store.

3. Where Shopify stores lose revenue in the cart-to-checkout flow

Shopify stores lose most cart-to-checkout revenue to a short list of fixable problems, plus one group of shoppers who were never going to buy. Separating the two is the first step.

Baymard Institute found that 43% of shoppers abandon because they were “just browsing” or not ready to buy (Baymard Institute). You cannot fix that group, so ignore them and focus on the rest.

Once you remove the browsers, the remaining reasons are mostly design problems you can fix. The table below shows each reason, how many shoppers it affects, and which stage of optimization addresses it.

Source: Baymard Institute, reasons for abandonment excluding the “just browsing” group.

The lesson is direct. Extra costs are the biggest single problem, so transparency about price is the highest-value fix on the whole list.

4. Cart optimization tactics that increase AOV on Shopify

Cart optimization on Shopify comes down to four tactics, listed here from highest to lowest impact. Each one raises AOV without cutting your margin through blanket discounts.

#1 Set a free shipping threshold above your AOV

A free shipping threshold set above your current AOV pushes shoppers to add one more item to qualify. The threshold works because shoppers treat “free” as a separate benefit, not just a discount.

Set the threshold about 15% to 30% above your current AOV. If your AOV is $65, a threshold near $75 to $85 stays achievable while still moving the number. The average US free shipping threshold reached $64 in 2023, up 23% from $52 in 2019 (Capital One Shopping research).

#2 Add a free shipping progress bar

A free shipping progress bar shows shoppers how close they are to the reward, which makes them add more. This effect has a name in behavioral research: the goal-gradient effect, documented by Kivetz, Urminsky, and Zheng, which shows people speed up their effort as they get closer to a goal.

The results are measurable. The apparel retailer RIPT Apparel tested a free shipping progress bar at a $69 threshold and recorded a 7.9% increase in average order value (Ecomhint case study). A progress bar is one of the visibility tools inside promotion apps such as BOGOS, which merchants use to show reward progress directly in the cart.

#3 Offer bundles and mix-and-match

Bundles increase AOV by giving shoppers a reason to buy the full set instead of one item. Industry data reports AOV lifts of roughly 20% to 30% for stores that bundle well.

Mix-and-match bundles let shoppers build their own set from a collection, which suits beauty, food, and apparel stores. Our guide to the Shopify product bundle covers the exact setups that work for each store type.

#4 Add cart upsells and cross-sells

Cart upsells and cross-sells raise AOV by suggesting relevant add-ons while the shopper reviews the order. The key is relevance, since a matched suggestion converts far better than a random one.

Cart upsells work best inside a slide-cart drawer, where add-ons appear without interrupting the flow. Apps such as CartyLabs Shopify cart drawer and upsell tools and similar options let you build the drawer and control which products it suggests. For the strategy behind these offers, see our guide to upsell in Shopify.

5. Checkout optimization tactics that recover conversions on Shopify

Checkout optimization on Shopify comes down to six fixes, each mapped to a reason shoppers abandon. Apply them in order, since the first three recover the most revenue.

1. Show the full cost before checkout. Display shipping, tax, and any fees on the cart page, not at the payment step. This targets the number one reason for abandonment, since 48% of shoppers quit when extra costs appear late (Baymard, via eMarketer).
2. Enable Shop Pay and express wallets. Shop Pay autofills payment and address details for returning shoppers, which removes the biggest source of form fatigue. Its mere presence lifts lower-funnel conversion by 5%, and Shop Pay orders carry about 15% higher AOV than other checkout methods (Shopify case study).
3. Offer guest checkout. A prominent guest checkout option removes the forced-account barrier that pushes away 19% of shoppers. Make “Check out as guest” the most visible option and move “Sign in” to a secondary position.
4. Reduce form fields. The average checkout has 23.48 form elements, while the ideal is 12 to 14 (Baymard Institute). Remove every field the order does not truly need.
5. Add trust signals and more payment methods. Security badges, clear return policies, and recognizable payment logos reduce the 19% who abandon over card trust. More payment options also help shoppers who prefer a specific method.
6. Speed up the checkout. Slow pages cost sales, since each one-second delay can reduce conversions by around 7% (Akamai research). This matters most on mobile, where conversion already trails desktop at roughly 3.0% versus 4.4% (Shopify).

Shopify’s native Checkout Extensibility covers most of what stores need to reshape the payment step. For deeper changes like custom fields, checkout upsells, or trust badges, tools such as CartyLabs checkout customization extend what the native settings allow.

6. How to measure the revenue impact for your store

You measure the revenue impact by tracking four numbers before and after each change. This tells you which optimization actually moved money.

Track these four metrics:

• Cart abandonment rate: the share of carts that never reach a completed order.
• Checkout completion rate: the share of started checkouts that finish. A good Shopify blended rate in 2026 sits around 45% to 55%.
• Average order value: total revenue divided by number of orders.
• Revenue per visitor: total revenue divided by total visitors, which combines conversion and AOV in one figure.

To size your opportunity, use your own numbers in the revenue formula. Multiply your monthly visitors by your conversion rate to get orders, then multiply orders by AOV to get revenue. Change one variable at a time and watch which change produces the larger gain.

7. Common mistakes to avoid

Merchants lose money by making the same avoidable errors in the cart-to-checkout flow. Watch for these five.

• Optimizing only one side. Fixing checkout while ignoring the cart leaves the AOV half of the revenue formula untouched.
• Setting the free shipping threshold below your AOV. A threshold below AOV subsidizes shipping without earning any extra items.
• Stacking too many upsells. One or two relevant offers convert. A wall of offers creates friction and lowers trust.
• Adding friction in the name of trust. Extra fields, pop-ups, and forced accounts drive shoppers away faster than they build confidence.
• Ignoring mobile. Most traffic is mobile, yet mobile conversion trails desktop, so a checkout that only works well on desktop wastes your largest audience.

8. Tools to run cart and checkout optimization on Shopify

You run cart and checkout optimization with a mix of native Shopify features and third-party apps. The table below shows which tool type fits each job.

For the checkout side, start with Shop Pay and Checkout Extensibility, since they are free and built in. For the cart side, promotion apps handle the AOV tactics. BOGOS is one such option for free gifts, bundles, cart upsells, and progress bars, and it sits alongside established alternatives, so compare a few against your store’s specific goals before you choose. The right tool is the one that fits your campaigns, not the one with the longest feature list.

Conclusion

Shopify cart and checkout optimization increase revenue by moving two different parts of the same formula, so the smartest merchants run both. Checkout optimization recovers the conversions you are losing to friction. Cart optimization grows the value of every order you keep. Together they compound, which means more revenue from the traffic you already have.

Fix the checkout leaks first, then add cart tactics that lift AOV, and measure each change against your own numbers. For the bigger picture of how these pieces fit into store growth, see our guide on how to increase sales on Shopify.

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