In this article, I'd like to explain "What is 'arrival rate'". Let's characterize it and answer some popular questions.

The mean number of new calling units arriving at a service facility per unit time.

Do you know what makes people curious? Here are a few questions and answers:

## Arrival rate

### What is the difference between arrival rate and inter-arrival time...

The arrival rate is the number of arrivals per unit of time. The inter arrival time is the time between each arrival into the system and the next.

### How do you calculate arrival rate...

Divide the number of incoming calls by the seconds, minutes or hours per day. For example, say 10,000 calls came in over the course of one day and you want to calculate the arrival rate per minute. The equation would read: 10,000 calls / 1,440 = 6.94444 or the arrival rate is just about 7 calls per minute.

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Materials: What is 'arrival rate' 🧑‍🔧
What is 'arrival rate' 🧑‍🔧