XBKit·Amazon

Inventory Turnover Calculator

Calculate how fast your inventory sells. High turnover means lean cash flow; too slow risks long-term storage fees.

Inventory Data

Amazon Storage Fees

Jan–Sep: $0.78/cu ft/mo (standard)

Oct–Dec: $2.40/cu ft/mo (Q4 peak)

Long-term (>365 days): $6.90/cu ft/mo

Formula
Days to Sell=30÷Monthly Turnover Rate
  • Monthly Turnover = Sales ÷ Avg Inventory
  • Ideal DSI (Amazon FBA)14 – 45 days
  • Long-term storage risk> 365 days
  • Stockout risk< 7 days