Every online store leaks revenue at the checkout. Shoppers add products to their cart, then leave before paying because of a surprise shipping cost, a forced sign-up or a checkout that asks for too much. This free calculator turns that quiet leak into a real monthly and yearly figure so you can see what it is worth to fix.
Enter your monthly sessions, conversion rate, average order value and cart abandonment rate. The tool works out how many carts are started, how many are abandoned and the revenue that walks away, then shows how much a recovery email or SMS flow could win back at realistic 5%, 10% and 15% recovery rates. It is built for Shopify and other ecommerce store owners, marketers and founders who want a fast, defensible number to justify improving their checkout or adding recovery automation. Use it to size the prize before you spend a penny on tools or development, then track the same figure as your checkout gets faster, your shipping gets clearer and your recovery flows go live.
The Baymard Institute puts the average at around 70% across studies.
Recover some of it with email flows
Most abandonment comes down to a handful of fixable things. The top causes across research:
Unexpected extra costs
Shipping, taxes or fees revealed at checkout are the single biggest reason shoppers leave. Show the full price early.
Forced account creation
Making people register before they can pay kills conversions. Offer a guest checkout.
A long or confusing checkout
Too many steps and form fields cause drop-off. Keep it to as few screens as possible with clear progress.
A slow or clunky site
Every extra second of load time drags conversion down, especially on mobile. Speed is a checkout feature.
Completed orders = sessions × conversion rate. Carts started = orders ÷ (1 − abandonment rate). Abandoned carts = carts started − completed orders. Lost revenue = abandoned carts × average order value. Recoverable revenue applies a 5%, 10% or 15% recovery rate to that lost figure.
The 70% default abandonment rate is the Baymard Institute average across published studies. The 5% to 15% recovery band reflects typical results from a well configured abandoned cart flow. These are estimates to size the opportunity, not a guarantee. Validate against your own analytics before acting.
Pricing and benchmarks last verified 2026-07-04. Always confirm current figures with the providers before making decisions.
Across studies compiled by the Baymard Institute the average sits at around 70%, meaning roughly seven in ten shoppers who add to a cart leave without buying. Rates vary by sector, device and traffic source, so use your own analytics figure if you have it.
We take your completed orders (sessions multiplied by conversion rate), scale that up to the total carts started using your abandonment rate, and multiply the abandoned carts by your average order value. It is an estimate of the revenue that reached the cart but did not convert.
A well set up abandoned cart email or SMS flow typically wins back somewhere in the 5% to 15% range of otherwise lost revenue. The table shows all three so you can see a conservative and an optimistic figure.
The biggest single cause is unexpected extra costs at checkout, followed by forced account creation, a long checkout and a slow site. Fixing those in the store itself usually beats chasing recovery emails after the fact.
No. This models cart abandonment only, not browse abandonment. It answers a narrower, more actionable question: of the shoppers who were ready enough to start a cart, how much revenue slipped away.
Built by JW Digital, a Manchester ecommerce agency. We build fast, conversion-focused Shopify and custom stores that do more without the monthly app bloat. Get a free quote, no obligation.