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Inventory

Sales velocity

How fast a product sells — units per day, week or month.

Sales velocity is the rate a product sells at, usually units per day. It drives inventory planning (runway, reorder timing) and signals momentum — a rising velocity may mean it's time to reorder sooner or scale ads; a falling one may mean a problem to investigate.

Formula

Sales velocity = Units sold ÷ Days in period

Example: 600 units over 30 days = 20 units/day.

What a good result depends on

Trend matters most — compare against stock on hand and lead time.

Common mistakes

  • Using a promo-spike period as the baseline.
  • Ignoring velocity changes until you've already stocked out.
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Inventory Runway Calculator
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Which products are losing sales momentum this month?

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