Amazon FBA Reorder Point Calculator
Know exactly when to reorder inventory so you never stock out and lose your Amazon ranking.
Reorder Point Calculator
Results
When inventory reaches this level, place a new order
What is a Reorder Point?
A reorder point is the inventory level at which you should place a new purchase order. When your stock hits this number, it's time to reorder so new inventory arrives before you run out.
For Amazon FBA sellers, reorder points are critical. A stockout doesn't just mean lost sales — it means lost organic ranking, which can take weeks to recover. Lead times for imported goods are typically 30–90 days, making accurate reorder calculations essential.
How to Calculate Your Reorder Point
The basic formula is:
Reorder Point = (Avg Daily Sales × Lead Time Days) + Safety Stock
Worked example: You sell 15 units/day, your lead time from China is 45 days, and you want 10 buffer days of safety stock:
- Demand during lead time: 15 × 45 = 675 units
- Safety stock: 15 × 10 = 150 units
- Reorder point: 675 + 150 = 825 units
Understanding Your Results
Your reorder point is the sum of expected demand during lead time plus a safety buffer. Here are some benchmarks for Amazon FBA sellers:
- Buffer days: 7–14 days is typical for domestic suppliers; 14–30 days for overseas suppliers
- Service level: 95% is the recommended starting point — it covers most demand variability without excessive overstock
- Lead time: Include all delays — supplier production, ocean freight, customs, Amazon receiving (which can take 1–2 weeks during peak)
Frequently Asked Questions
A reorder point is the specific inventory quantity that triggers a new purchase order. When your available stock drops to or below this number, it’s time to order more. The goal is to have new inventory arrive just before you run out, accounting for lead time and demand variability.
Pull your unit sales from Seller Central for the last 30–90 days and divide by the number of days. Use a longer period (60–90 days) for products with variable demand, and a shorter period (30 days) for products with consistent sales. Exclude any days where you were out of stock, as they would skew the average downward.
For most Amazon FBA sellers, 95% is the sweet spot. It provides strong protection against stockouts without requiring excessive safety stock. Use 97.5% or 99% for your best-selling products where a stockout would be devastating, and 90% for slower-moving SKUs where carrying cost matters more.
Total lead time includes: supplier production time (7–30 days), shipping to your prep center or Amazon (2–45 days depending on method), prep and labeling (1–3 days), shipping to Amazon FC (3–7 days), and Amazon receiving (3–14 days). Add these up for your realistic total lead time.
Stocking out on Amazon triggers a cascade of negative effects: your listing loses the Buy Box, your organic search ranking drops, your PPC campaigns pause, and competitors gain market share. Recovery can take 2–4 weeks of sales velocity to return to previous ranking, making prevention through proper reorder points far cheaper than the alternative.
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