Available to Promise (ATP)

Available to Promise (ATP) is a critical concept in inventory and order management that enables businesses to provide accurate and reliable delivery date commitments to customers. ATP refers to the quantity of a product that a company can promise to deliver to customers on a specific date based on the available inventory and production capacity at that moment. It helps in balancing customer demand with supply chain capabilities, ensuring efficient order fulfillment and customer satisfaction.

Calculating Available to Promise (ATP)

To calculate the Available to Promise quantity, several factors are taken into consideration:

  1. On-Hand Inventory: The quantity of the product currently available in the company’s inventory and ready for immediate shipment.
  2. Committed Inventory: The quantity of the product that has been reserved for existing orders or customer commitments.
  3. Planned Production: The quantity of the product that is scheduled to be produced within a specific time frame.
  4. Incoming Shipments: The quantity of the product expected to arrive from suppliers within the promised delivery date.
  5. Outgoing Shipments: The quantity of the product that is already allocated for pending orders and scheduled to leave the inventory before the promised delivery date.

By considering these factors, a company can determine the maximum quantity it can promise to deliver to customers by a particular date without overcommitting its resources.

Importance of Available to Promise (ATP)

ATP plays a crucial role in various aspects of business operations:

  1. Order Management: ATP helps in efficiently managing customer orders by providing real-time information about product availability. It allows businesses to promise accurate delivery dates to customers and avoid backorders or delayed shipments.
  2. Customer Satisfaction: By providing reliable delivery commitments, ATP enhances customer satisfaction and builds trust in the company’s ability to meet their expectations.
  3. Inventory Optimization: ATP aids in optimizing inventory levels by preventing overbooking of orders and ensuring optimal allocation of available stock.
  4. Supply Chain Efficiency: ATP facilitates better coordination between sales, production, and distribution teams, leading to improved supply chain efficiency.

Factors Affecting Available to Promise (ATP)

Several factors can impact the Available to Promise quantity:

  1. Real-Time Data: The accuracy of ATP calculations heavily relies on real-time data on inventory levels, production schedules, and incoming shipments.
  2. Demand Variability: Fluctuations in customer demand can affect ATP, as high demand may deplete available stock, leading to longer lead times.
  3. Production Lead Times: Longer production lead times can reduce ATP, especially for made-to-order or custom products.
  4. Supplier Reliability: Delays in receiving raw materials from suppliers can impact ATP, as it affects the production schedule.


Available to Promise (ATP) is a valuable tool that allows businesses to effectively manage customer orders, optimize inventory, and provide reliable delivery commitments. By leveraging ATP calculations, companies can strike a balance between customer demand and supply chain capabilities, ultimately enhancing customer satisfaction and operational efficiency.


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