How many API calls can an Enterprise/Pro organization make in 24 hours?

An Enterprise or Professional edition organization in Salesforce is allowed to make 1,000 API calls per user in a 24-hour period. This limitation is set to manage the load on Salesforce's servers, ensuring fair usage among all customers. API call limits are calculated based on the number of active user licenses in the organization, which means that an organization with more users can increase its total API call capacity by essentially multiplying the number of users by this per-user limit.

In practical terms, this means if your organization has multiple users, the total number of API calls allowable per day increases accordingly, but each individual user is still capped at 1,000 calls. Understanding this cap is crucial for developers and integrators, as it plays a significant role in planning integrations and ensuring that applications can perform as intended without exceeding API limits.

Considering limitations such as governor limits is essential for successful application design within Salesforce, as it directly impacts the functionality and responsiveness of integrations with external systems.