P90

 P90 is the most conservative demand forecast level commonly used by Amazon. It reflects a high-confidence estimate — meaning Amazon expects that actual weekly sales will not exceed this number 90% of the time. It is especially useful when planning for uncertain conditions, new product launches, or peak events like Prime Day or Q4 holidays.

How it works:

• A P90 forecast of 2,000 units means there's only a 10% chance weekly demand will exceed 2,000
• Helps vendors and supply chain teams prepare for worst-case (high-demand) scenarios

Comparison with other forecast levels:

• P50 - balanced, median scenario (50/50)
• P70 - moderate buffer
• P80 - high buffer
• P90 - maximum confidence for demand coverage

Where P90 is used:

• Peak planning (e.g. Prime Day, Black Friday, Holiday Season)
• New ASIN launches with uncertain sales curves
• Vendor negotiations and inventory risk sharing
• Replenishment and Buy Plans in Vendor Central

Why P90 matters:

• Helps prevent stockouts in high-demand periods
• Supports more aggressive production or procurement plans
• Often used to set upper thresholds for PO quantity discussions
• Useful in high-velocity, high-visibility categories (electronics, toys, consumables)

💡 Example: For a holiday-exclusive coffee gift set, Amazon provides a P90 forecast of 10,000 units per week to ensure vendor readiness for demand spikes in December.

In short:
P90 is Amazon’s most cautious forecast level, estimating weekly demand with 90% confidence - used to prepare for peak periods, ensure availability, and avoid stockouts in high-risk or high-growth scenarios.