---
title: "Available to promise"
description: "What is available to promise (ATP)? The stock you can still commit to new orders: on hand minus what is reserved. Learn how to calculate it, with an example."
url: https://1flux.ai/glossary/available-to-promise
last_updated: 2026-10-10
---

[Procurement and inventory](https://1flux.ai/glossary#procurement-and-inventory)

# Available to promise

What is available to promise, and why shouldn't salespeople quote from on-hand stock?

Glossary Updated 10 October 2026

Definition

Available to promise (ATP) is the quantity of an item you can still commit to new customer orders: stock on hand minus what is already reserved for other orders.

## What is available to promise used for?

Salespeople who quote from on-hand stock alone end up promising goods that already belong to another customer. ATP fixes that. Fuller definitions also add stock arriving on open purchase orders by the date it’s due.

Available to promise for one item

Example

- On hand

  500

- Reserved for confirmed orders

  −320

- Arriving next week on a PO

  +200

Available today

180

Up to 380 can be promised for delivery after the PO arrives.

ATP is per warehouse; stock held in another branch may need a [stock transfer](https://1flux.ai/glossary/stock-transfer) first. Reservations come from confirmed orders, see [stock reservation](https://1flux.ai/glossary/stock-reservation).

In 1flux

1flux shows on hand, reserved, available and awaiting receipt for every item and warehouse, and the Inventory overview has an available-to-promise tile. [See multi-warehouse stock, picking and dispatch](https://1flux.ai/products/inventory/multi-warehouse)

Related

## Keep exploring

### [Stock reservation](https://1flux.ai/glossary/stock-reservation)

Stock set aside for a confirmed customer order.

### [Sales order](https://1flux.ai/glossary/sales-order)

The seller's confirmed record of what a customer ordered.

### [Purchase order](https://1flux.ai/glossary/purchase-order)

A buyer's formal, numbered order to a supplier.

### [Multi-warehouse](https://1flux.ai/products/inventory/multi-warehouse)

Stock per warehouse and company, reservations, a price-free pick board and delivery notes.

Last updated 10 October 2026