Enter average daily sales, lead time, safety buffer, unit cost, and ordering costs. Get reorder point, safety stock quantity, EOQ, and annual holding versus ordering costs so you know when to restock and how much to order.
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Decide how much stock or cash to commit by testing demand, reorder, and carrying-cost assumptions. It covers reorder point, safety stock, economic order quantity, and carrying costs for your inventory.
Instant calculations · Editable fee assumptions · Export-ready results
Values update results instantly. Adjust fee assumptions to match your seller dashboard.
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Average units sold per day.
Days from placing order to receiving inventory.
Buffer days to cover demand variability and delays.
Purchase or manufacturing cost per unit.
Fixed cost to place one purchase order (shipping, labor, fees).
Annual cost to hold inventory as percent of unit cost (storage, capital, risk). Typical 20-30%.
Operating days used to calculate annual demand.
Live estimates based on your inputs and editable fee assumptions.
Daily sales
10
Average units per day.
Lead time days
7
Supplier lead time.
Safety days
5
Buffer days configured.
Reorder point
120
Restock when inventory hits this level.
Safety stock quantity
50
Buffer units to hold.
Avg inventory at reorder
85
Average units on hand before new delivery.
Economic order quantity (EOQ)
311.98
Cost-optimal order size.
Annual holding cost at EOQ
$584.97
Holding cost if you order EOQ.
Annual ordering cost at EOQ
$584.97
Ordering cost if you order EOQ.
Total inventory cost
$1,169.94
Holding plus ordering at EOQ.
What this means
Reorder at 120 units (7d lead + 5d safety × 10/day). Safety buffer 50 units. Optimal order about 312 units, holding $584.97 and ordering $584.97 yearly, total $1169.94 at EOQ.
Interactive breakdown of fees, costs, and remaining profit.
Distribution
Total $431.98 · 3 segments · interactive
Dollar amounts, share of revenue, and visual proportion.
Assumptions used
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Explore General BusinessGenerated 9/9/2026, 5:47:52 PM · Currency USD
Reorder at 120 units (7d lead + 5d safety × 10/day). Safety buffer 50 units. Optimal order about 312 units, holding $584.97 and ordering $584.97 yearly, total $1169.94 at EOQ.
How it works
This calculator is transparent by design. Review the steps and formulas so you can trust the estimate and adjust assumptions when your dashboard differs.
Sources & review
This calculator is intentionally platform-agnostic, so it does not attach a platform fee URL.
No single official fee page is attached here. The model keeps these inputs editable so you can use the terms that apply to your situation.
This model uses editable planning assumptions. Confirm tax, payment, financing, or operating terms with the relevant provider, official authority, or adviser for your situation.
Defaults are editable estimates. Match them to your current account, provider statement, official authority, lender, or adviser before making a pricing or investment decision.
Calculator model reviewed: August 9, 2026. This date covers the page and calculator guidance, not a guarantee that every live platform rate or term was re-audited on that date.
Worked example
You sell 10 per day, lead time 7 days, safety 5 days, $15 unit cost, $50 per order, 25% holding cost, 365 days.
FAQ
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