Refunds hit ecommerce P&Ls in three places that operators usually only count one of. Lost revenue (the obvious one). Lost gross profit on already-paid CAC. And the operational overhead — payment processing fees that don\'t come back, customer service time, return shipping, restocking labor. The full cost is usually 1.5-2× the refund value alone.
This calculator captures all three. Take your refund rate, apply it to monthly revenue, then layer on processing fee loss (3% on the refunded amount that Stripe keeps) plus per-refund operational costs. The total is your monthly refund cost — the number to optimize against, not the headline refund rate.
The actionable insight is that small reductions in refund rate produce outsized P&L improvements. Reducing refund rate from 15% to 12% on a $200K monthly revenue brand saves roughly $4K/month after fees and overhead — annual run-rate of $48K, all profit. Investments in sizing tools, photography, and clarity around shipping timelines often pay back faster than ad spend optimization.
Pair with the Returns Profit Killer (similar but more focused on apparel) and the Contribution Margin Calculator. Most operators discover their effective refund cost is materially higher than their stated refund rate suggests.
Frequently asked questions
What's a normal refund rate?
Apparel: 20-35% (size/fit issues). Beauty/cosmetics: 8-15%. Electronics: 10-20% (functional issues). Food/consumables: under 5%. Furniture/home goods: 5-15%. Industry varies hugely — track yours specifically rather than relying on benchmarks.
What's the real cost beyond the refund itself?
Per refund: $5-15 in CS time, $3-8 in processing/shipping label, $5-15 in restocking labor, plus payment processing fees you don't recover (the 3% goes to Stripe even if you refund). Total: $15-50 per refund on top of the lost margin.
How does refund rate affect contribution margin?
Significantly. A 25% refund rate on apparel essentially means every 4th order is unprofitable — you collected revenue, paid all the CAC and fulfillment, then refunded everything except the processing fees and shipping costs. Build a returns reserve into your margin math.
Should I prevent refunds or accept them?
Prevent the preventable, accept the rest. Sizing tools (apparel), product photography accuracy, clear shipping timelines — these reduce avoidable refunds. Don't fight legitimate refunds (damaged, wrong item, dissatisfied) — bad reviews and chargebacks cost more than the refund itself.
What about partial refunds?
Often the right strategic answer. A "20% off your next order in lieu of full refund" offer typically retains 60-70% of customers vs full refund (where many never return). Costs you the discount on next order, saves you the processing fee loss and CS time on the original.