Variables Limit in Power Automate

Question

While building flows in Power Automate, I often rely on variables to store temporary values, track intermediate results, and manage data transformations throughout the flow’s execution.

For example, I use string variables to build custom messages, array variables to loop through datasets, and object variables to structure JSON data. As my flows grow more complex especially with multiple parallel branches and nested loops, I'm starting to worry about whether there's a maximum number of variables allowed in a single flow. I need to understand the Power Automate limitations to avoid unexpected failures or performance issues.

Answer 1

How many variables limits can you use in a single Power Automate flow?

In Power Automate, each flow is allowed to define up to 250 variables. This limit includes all types of variables such as string, integer, float, boolean, array, and object declared using the "Initialize variable" or "Set variable" actions.

If your flow requires extensive use of variables, it's a good practice to:

• Use expressions directly when possible instead of storing results in variables.
• Group related data inside objects or arrays to reduce the number of separate variables.
• Offload complex logic to child flows where appropriate.

Exceeding the variable limit will prevent your flow from saving or running correctly. Planning your variable usage efficiently not only helps you stay within limits but also improves flow readability and performance.

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See Also

• Microsoft Docs – Power Automate limits and configuration