Enter the total time and 1.5 into the calculator to determine the number of 90-minute cycles.

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## 90 Minute Cycle Formula

The following formula is used to calculate the number of 90-minute cycles in a given time period.

C = T / 1.5

Variables:

- C is the number of 90-minute cycles T is the total time in minutes

To calculate the number of 90-minute cycles, divide the total time in minutes by 1.5. This will give you the number of 90-minute cycles in that time period.

## What is a 90 Minute Cycle?

A 90 Minute Cycle, also known as the ultradian rhythm, is a biological rhythm that our bodies follow throughout the day. It refers to the alternating periods of high-frequency brain activity (approximately 90 minutes) followed by lower-frequency brain activity (approximately 20 minutes). This cycle is most commonly associated with sleep, where it is observed as the alternation between REM and non-REM sleep stages. However, it also applies to our waking hours, affecting our attention, alertness, and even mood. Understanding and respecting this cycle can help improve productivity and overall well-being.

## How to Calculate 90 Minute Cycle?

The following steps outline how to calculate the number of 90-minute cycles in a given total time.

- First, determine the total time in minutes (T).
- Next, divide the total time by 1.5 to calculate the number of 90-minute cycles (C = T / 1.5).
- Finally, calculate the number of 90-minute cycles (C).
- After inserting the value of T and calculating the result, check your answer with the calculator above.

**Example Problem:**

Use the following variables as an example problem to test your knowledge.

Total time in minutes (T) = 120