Amazon Seller Tools
Amazon Inventory Restock Calculator
Estimate Amazon restock timing and reorder quantity using current stock, sales velocity, supplier lead time, safety stock, target coverage, storage cost, unit economics, and inventory risk.
Restock inputs
Enter current stock, recent sales, review period, lead time, safety stock, target coverage, unit economics, and traffic assumptions to estimate Amazon reorder timing and restock quantity.
Inventory and sales pace
Restock timing
Unit economics and risk
Results
Estimated Amazon restock timing and quantity.
Recommended restock
15 units
Target stock level minus current stock
Reorder point
93 units
Lead time demand plus safety stock
Days of stock left
40 days
Current stock divided by daily sales pace
Days until reorder
9 days
Estimated time before stock reaches reorder point
Daily sales pace
3
Units sold divided by review period days
Monthly sales pace
90
Estimated units sold every 30 days
Lead time demand
63 units
Estimated units sold during supplier lead time
Safety stock
30 units
Extra inventory coverage based on safety stock days
Estimated restock cost
$204.71
Recommended restock quantity multiplied by unit cost, prep, and defect risk
Expected restock profit
$114.04
Profit from recommended restock after defect allowance
Restock ROI
55.7%
Expected restock profit divided by estimated restock cost
Current inventory value
$1,440.00
Current stock multiplied by unit cost
Current stock profit potential
$960.00
Current stock multiplied by profit per unit
Storage drag
$30.00
Current stock multiplied by entered storage cost per unit
Estimated traffic orders
200
Monthly sessions multiplied by conversion rate
Sell-through pressure
75.0%
Monthly sales pace divided by current stock
What this means
Current stock is estimated to last 40 days at the current sales pace.
The reorder point is 93 units. To reach 45 days of target coverage, the calculator recommends restocking 15 units.
Estimated restock cost is $204.71 with expected restock profit of $114.04.
Restock quantity comparison
| Qty | Cost | Profit | ROI | Days covered | Status |
|---|---|---|---|---|---|
| 25 | $341.19 | $190.06 | 55.7% | 48.3 | Healthy |
| 50 | $682.38 | $380.13 | 55.7% | 56.7 | Healthy |
| 100 | $1,364.75 | $760.25 | 55.7% | 73.3 | Healthy |
| 150 | $2,047.13 | $1,140.38 | 55.7% | 90 | Healthy |
| 250 | $3,411.88 | $1,900.63 | 55.7% | 123.3 | Heavy |
How to use this Amazon Inventory Restock Calculator
Enter stock
Add current stock, units sold, and review period to estimate sales velocity.
Add lead time
Include supplier lead time and safety stock coverage so reorder timing reflects delays.
Estimate economics
Add unit cost, prep cost, profit per unit, storage cost, and defect risk.
Review restock need
Compare current stock against reorder point, target coverage, restock cost, and profit potential.
Amazon inventory restock breakdown
Review how current stock, sales pace, restock cost, storage, and risk affect inventory decisions.
Current inventory value
$1,440.00
703.4% compared with restock cost
Estimated restock cost
$204.71
100.0% compared with restock cost
Expected restock profit
$114.04
55.7% compared with restock cost
Defect / unsellable cost
$5.96
2.9% compared with restock cost
Storage drag
$30.00
14.7% compared with restock cost
Current stock profit potential
$960.00
469.0% compared with restock cost
Common Amazon inventory mistakes
- ×Waiting until stock reaches zero before reordering.
- ×Restocking based on guesses instead of recent sales pace.
- ×Ignoring supplier lead time, inbound shipping, prep time, or FBA receiving delays.
- ×Buying too much inventory for products with weak conversion or low profit.
- ×Forgetting storage cost, cash flow, defects, refunds, stale inventory risk, or seasonal demand.
- ×Restocking slow-moving products before reviewing sales velocity and listing performance.
Understanding your Amazon restock results
Healthy: Current stock appears workable under the entered sales pace and lead time assumptions.
Restock Soon: Current stock is at or below the estimated reorder point, so restock may be justified if demand and profit are reliable.
Watch Stock: Inventory is not critically low, but stock may need attention soon if sales velocity continues.
Slow Moving: The item has little or no sales velocity in the entered review period, so restocking may be risky.
What Amazon sellers should include
- ✓Current available stock and ready-to-sell inventory.
- ✓Units sold during a clear review period.
- ✓Supplier lead time, inbound shipping time, prep time, and FBA receiving time.
- ✓Safety stock needed for demand spikes, delays, or restock limits.
- ✓Unit cost, expected profit per unit, storage cost, defect risk, and cash flow.
- ✓Conversion rate, sessions, listing performance, refund risk, and seasonal demand.
Ways to improve Amazon restock planning
Restock winners first
Prioritize listings with steady sales, strong profit, and manageable returns.
Use reorder points
Set reorder points based on sales pace, lead time, and safety stock instead of guessing.
Protect cash flow
Avoid tying up too much cash in slow-moving inventory or risky seasonal products.
Improve sell-through
Improve photos, price, listing content, PPC, and reviews before buying more weak inventory.