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Inventory Tool

Order Quantity Calculator — Know Exactly How Much to Order

Calculate order quantity based on sales rate, desired stock cover days, and supplier MOQ.

Use the Calculator

Formula & How It Works

Total Needed = Daily Sales × (Cover Days + Safety Days)
Order Qty = Total Needed − Current Stock (adjusted to MOQ)

Worked Example

Daily 50, Stock 150, 30d cover, 7d safety, MOQ 100 → Need 1,850 − 150 = 1,700 → 1,700 units

When to Use This Calculator

  • Daily purchase planning
  • Avoid stockouts without over-buying
  • Respect supplier MOQ

Frequently Asked Questions

EOQ minimises total cost. This ensures adequate supply for desired days.
Current Stock ÷ Daily Sales — how many days until stockout.
Buffer against demand spikes and delivery delays.
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