Why Back-in-Stock Emails Recover Lost Revenue
Every sold-out product page is a revenue leak. When a customer arrives at a product page and sees "Sold Out," 70% leave your store entirely — many to a competitor. Without a back-in-stock notification system, you lose that sale permanently. The customer may never return.
Back-in-stock email notifications transform this loss into deferred revenue. By capturing the customer's email when they encounter a stockout, you create a high-intent remarketing list that converts at 12-25% — 5-10x higher than general promotional emails. The reason: these subscribers have already done the research, decided they want the product, and are just waiting for availability. When you notify them, the purchase decision is already made.
The revenue impact is substantial. Shopify stores with back-in-stock notification systems recover $3-$12 per notification subscriber. For a popular product with 500 waitlist signups, that is $1,500-$6,000 in recovered revenue from a single restock event — revenue that would have been permanently lost without the notification system.
Capturing Back-in-Stock Subscribers
The effectiveness of your restock emails depends entirely on how many subscribers you capture. Here are the highest-converting methods:
Product page notification form: Replace the sold-out "Add to Cart" button with a prominent "Notify Me When Available" email capture form. This should be the primary CTA on out-of-stock product pages. Keep the form simple — email only, one click to submit. Display the waitlist count ("247 people are waiting for this product") to create social proof.
Popup on sold-out pages: Use the EA Email Popup and Spin Wheel to trigger a targeted popup when visitors land on sold-out product pages. Instead of the standard discount offer, the popup says "This product is temporarily sold out. Spin the wheel to win early access + a discount when it returns!" This captures 15-20% of sold-out page visitors compared to 5-8% for a static form.
Back-in-stock landing page: For your most popular products, create a dedicated waitlist landing page with product details, expected restock date, and an email capture form. Drive traffic from social media, ads, and existing email campaigns. Include a FAQ section addressing common questions about restocking timeline and product availability.
Template 1: Instant Back-in-Stock Alert (Send Within Minutes)
This is the most time-sensitive email you will ever send. Speed matters more than perfection — every hour of delay reduces conversion by approximately 5%. Automate this email to trigger within 5-15 minutes of inventory being updated in Shopify.
Timing: Immediately upon restock (within 5-15 minutes). Send at any time of day — urgency overrides time-of-day optimization.
Subject line: It is BACK: {{product_name}} is in stock again!
Preview text: The wait is over, {{first_name}}. {{product_name}} just restocked — but {{waitlist_count}} people are waiting. Get yours now.
Hi {{first_name}},
Great news — the product you have been waiting for is officially back in stock!
[PRODUCT IMAGE: High-quality product photo]
{{product_name}}
${{price}} — In stock now{{waitlist_count}} people were waiting for this restock. Limited quantities available.
You signed up to be notified when this item came back. It sold out in {{previous_sellout_time}} last time, so we recommend acting quickly.
[CTA BUTTON: "Buy {{product_name}} Now — Before It Sells Out Again"]
Product details:
- Available sizes/variants: {{available_variants}}
- Price: ${{price}} (same as before — no price increase)
- Shipping: {{shipping_info}}
- Reviews: {{star_rating}} stars from {{review_count}} reviews
Do not miss it this time,
The {{brand_name}} TeamP.S. We cannot guarantee how long this stock will last. Last time it sold out in {{previous_sellout_time}}.
A/B test ideas:
- Subject line: "It is BACK!" urgency vs. "Good news, {{first_name}}" personal vs. "{{product_name}} just restocked ({{waitlist_count}} people waiting)"
- Urgency element: Waitlist count vs. previous sell-out time vs. remaining inventory count
- CTA: "Buy Now" vs. "Grab Yours Before It Sells Out" vs. "Add to Cart"
Template 2: 24-Hour Reminder (For Non-Purchasers)
Send this only to subscribers who opened the first email but did not purchase. The reminder adds updated inventory data and stronger urgency. About 20-30% of back-in-stock conversions come from this second email.
Timing: 24 hours after the initial notification. Only to openers who did not click or clickers who did not purchase.
Subject line: Still in stock (for now): {{product_name}} — {{remaining_pct}}% of restock remaining
Preview text: {{units_sold}} units sold since yesterday. {{remaining_units}} left in stock. Last chance, {{first_name}}.
Hi {{first_name}},
Quick update: the {{product_name}} is still in stock — but it is going fast.
Since we restocked yesterday:
- {{units_sold}} units sold
- {{remaining_units}} units remaining
- {{sold_out_variants}} sizes/variants already sold out again
[PRODUCT IMAGE]
{{product_name}} — ${{price}}
[CTA BUTTON: "Get Mine Before It Sells Out Again"]
Why customers love this product:
"{{top_review}}" — {{reviewer_name}}, verified buyer
We do not know when we will be able to restock again after this batch sells through. If you want it, now is the time.
The {{brand_name}} Team
Template 3: Selling Fast / Low-Stock Alert (48-72 Hours After Restock)
The final email in the back-in-stock sequence targets subscribers who have not yet purchased, using real inventory scarcity as the urgency driver. Only send this if stock is genuinely running low (below 25% of restock quantity).
Timing: 48-72 hours after restock. Only send if remaining inventory is below 25% of the restocked amount.
Subject line: Almost gone: only {{remaining_units}} {{product_name}} left
Preview text: {{sold_pct}}% of our restock is already sold. {{remaining_units}} units left. This is your last chance, {{first_name}}.
{{first_name}}, final alert:
We restocked {{total_restocked}} units of the {{product_name}} {{days_ago}} days ago. Only {{remaining_units}} are left.
{{remaining_units}} remaining out of {{total_restocked}}
Expected to sell out by {{estimated_sellout}}Once these are gone, we cannot guarantee a next restock date.
[CTA BUTTON: "Buy Now — Only {{remaining_units}} Left"]
The {{brand_name}} Team
Template 4: Pre-Order Notification
For products with known restock dates, offer pre-orders to capture sales before the inventory arrives. Pre-order emails work well for popular items with consistent demand and achieve 15-25% conversion from waitlist subscribers.
Timing: 1-2 weeks before expected restock date. Triggered manually when a restock order is confirmed with your supplier.
Subject line: Pre-order now: {{product_name}} restocking on {{restock_date}}
Preview text: Guarantee yours before it sells out again. Pre-order now and ship on {{restock_date}}. Limited to {{preorder_limit}} units.
Hi {{first_name}},
You asked to be notified when the {{product_name}} comes back. Here is even better news: you can pre-order it now and guarantee yours before the public restock.
[PRODUCT IMAGE]
{{product_name}} — Pre-Order
Price: ${{price}}
Ships: {{restock_date}}
Pre-orders available: {{preorder_limit}} unitsWhy pre-order?
- Guarantee your size/variant before the rush
- Last restock sold out in {{previous_sellout_time}}
- {{waitlist_count}} people are on the waitlist
- Pre-order customers ship first on restock day
[CTA BUTTON: "Pre-Order Now — Ships {{restock_date}}"]
The {{brand_name}} Team
You will not be charged until the item ships. Cancel anytime before {{restock_date}}.
Template 5: Permanent Out-of-Stock Alternative
When a product is permanently discontinued, do not let the waitlist die. Send subscribers to alternative products that meet the same need. This email recovers 10-20% of waitlist subscribers as purchasers of alternative items.
Timing: When you decide not to restock a product. Send once, with finality.
Subject line: {{product_name}} update + alternatives you will love, {{first_name}}
Preview text: We have an honest update about the {{product_name}}, plus 3 alternatives we think you will love even more.
Hi {{first_name}},
We owe you an honest update about the {{product_name}} you have been waiting for.
After careful consideration, we have decided not to restock this particular item. We know this is disappointing, and we are sorry for the wait.
Here is the good news: We have three alternatives that our team (and customers) actually prefer:
[PRODUCT BLOCK: 3 alternative products with images, prices, star ratings, and brief comparison notes]
As a thank you for your patience, here is an exclusive discount on any of these alternatives:
{{apology_discount}}% OFF — Code: {{apology_code}}
Valid for 14 days[CTA BUTTON: "Shop Alternatives"]
We appreciate your patience and understanding.
The {{brand_name}} Team
Personalization Variables for Back-in-Stock Emails
| Variable | Source | Example | Impact |
|---|---|---|---|
| {{product_name}} | Waitlist signup | "Classic Tote — Navy" | Critical for relevance |
| {{waitlist_count}} | Notification system | "347" | Creates social urgency |
| {{remaining_units}} | Live inventory | "42" | Real scarcity driver |
| {{previous_sellout_time}} | Historical data | "6 hours" | Sets urgency expectation |
| {{restock_date}} | Inventory planning | "April 15" | Pre-order conversion |
| {{signup_date}} | Waitlist data | "February 3" | "You have waited X days" |
| {{available_variants}} | Inventory | "S, M, L, XL" | Reduces friction |
Metrics and Benchmarks
Key Benchmarks: Back-in-stock notifications achieve 55-70% open rates, 20-35% click rates, and 12-25% conversion rates. Revenue per notification subscriber is $3-12 depending on product price and urgency. A 3-email restock sequence (instant, 24h, 48h) recovers 60-80% of the total recoverable revenue from a stockout waitlist.
| Metric | Instant Alert | 24h Reminder | Low-Stock Alert |
|---|---|---|---|
| Open rate | 55-70% | 40-55% | 45-60% |
| Click rate | 20-35% | 15-25% | 18-30% |
| Conversion rate | 12-25% | 8-15% | 10-20% |
| Revenue share | 50-60% | 20-25% | 15-25% |
Frequently Asked Questions
What is a good conversion rate for back-in-stock emails?
Back-in-stock emails convert at 12-25% — the highest of any automated email type. Open rates reach 55-70% and click rates 20-35%. If your conversion is below 10%, send the notification faster and add urgency about limited quantities.
How quickly should I send a back-in-stock email?
Send within 5-15 minutes of inventory being updated. Speed is critical — every hour of delay reduces conversion by approximately 5%. Automate the trigger tied to Shopify inventory management.
Should I offer a discount in back-in-stock emails?
Generally no. Subscribers already want the product at full price. Exception: if out of stock for 60+ days, a small 5-10% incentive can recapture customers who may have moved on. Never exceed 10%.
How do I collect back-in-stock email signups on Shopify?
Replace the sold-out button with a "Notify Me" email form. Use the EA Spin Wheel popup on sold-out pages for 15-20% capture rates. Apps like Klaviyo and Back in Stock add this functionality automatically.
How many back-in-stock emails should I send per restock?
Send 2-3 emails: instant notification, 24-hour reminder, and a selling-fast follow-up at 48-72 hours. Focus on limited stock urgency rather than repeated messaging.
Capture Emails on Sold-Out Product Pages
EA Email Popup and Spin Wheel triggers a targeted popup on sold-out pages, capturing 15-20% of visitors as back-in-stock notification subscribers with an interactive spin wheel experience.
Install EA Spin Wheel Free