Revenue from post-purchase email + SMS automation.
Inputs
25-40% typical
Flow contribution
Monthly incremental revenue—
Lifted repeat orders
—
Reviews captured
—
Cross-sell uplift
—
12-month contribution
Source
Monthly
Annual
About this calculator
The post-purchase flow is the most underbuilt automation in DTC ecommerce. Brands invest heavily in welcome flows and abandoned cart sequences but treat post-purchase as just an order confirmation. The result: missed second-purchase opportunity, no review velocity, and customers who never get the cross-sell trigger.
This calculator estimates incremental revenue from a complete post-purchase flow: increased repeat purchase rate (typical 25-40% lift over baseline), review velocity (8-15% of customers leave reviews when asked, vs under 2% organic), and cross-sell capture (lift effective AOV by 10-20% on second purchases). The model multiplies each component by your monthly order volume to project monthly and annual contribution.
The strategic value compounds. Reviews drive PDP conversion lift (3-8% improvement), SEO authority, and Meta/Google ad social proof. Repeat purchase rate increases LTV, which increases sustainable CAC, which unlocks budget for paid acquisition. Cross-sell shifts AOV up on subsequent orders. A well-built post-purchase flow contributes 5-10% of total revenue across these compounding effects.
Pair with the Cohort Retention calculator (where the flow has biggest LTV impact), Welcome Flow Revenue calculator (the front-end automation companion), and Repeat Purchase Rate calculator (the metric the flow is designed to lift). Most operators discover that adding 2-3 post-purchase emails (review request + cross-sell + reorder nudge) produces more revenue per build-hour than any other automation work.
Frequently asked questions
What's in a post-purchase flow?
5-7 emails over 30-60 days. Order confirmation (immediate), shipping (2-3 days), product education (1 week), review request (2 weeks), cross-sell (3 weeks), repeat purchase nudge (4-6 weeks). Some brands add NPS survey (45 days) and "we miss you" (90 days) to extend.
How does post-purchase impact LTV?
Massively. A well-built post-purchase flow lifts second-purchase rate by 25-40% and produces 5-10% of total revenue. Brands with no post-purchase flow rely on broadcasts and retargeting ads, which cost 3-5× more per repeat purchase.
When should the cross-sell trigger?
For consumables: 30-50% of expected reorder cycle. For durable: 60-90 days post-purchase, after the customer has experienced the product. Sending cross-sell too early (before product arrives) feels pushy. Too late (90+ days) misses the engagement window.
How important is the review request?
Critical for SEO, ad performance (Meta loves social proof), and trust on PDP. Brands that send review requests at 2 weeks post-delivery get 5-15% of customers to leave reviews. No review request = under 2% review rate, starving the review flywheel.
Should I segment post-purchase by product?
Yes for brands with diverse SKU ranges. The post-purchase flow for a $40 t-shirt customer looks different than for a $200 supplement customer. Klaviyo can branch the flow by ordered product or product category — this segmentation typically lifts post-purchase revenue 20-30% over a single generic flow.