ComfyMathExpression - ComfyUI Built-in Node Documentation

The ComfyMathExpression node evaluates a mathematical formula using a set of input values. You can write an expression using variable names (like a, b, c), and the node will calculate the result. It supports dynamically adding as many input values as needed for your calculation.

Inputs

Parameter	Description	Data Type	Required	Range
`expression`	The mathematical formula to evaluate. You can use variable names that correspond to the input values (default: “a + b”).	STRING	Yes	N/A
`values`	A set of numeric or boolean inputs that can be dynamically added. Each input is assigned a letter from the alphabet (a, b, c, …) to be used as a variable in the expression. At least one input value is required.	FLOAT, INT, BOOLEAN	No	N/A

Parameter Constraints:

The expression parameter cannot be empty or contain only whitespace.
The expression must evaluate to a finite numeric result (INT or FLOAT). Boolean or other non-numeric results will cause an error.
The input values for the values parameter can be numbers (INT or FLOAT) or boolean values (TRUE/FALSE).
At least one input value must be provided in the values group.

Outputs

Output Name	Description	Data Type
`FLOAT`	The result of the mathematical expression as a floating-point number.	FLOAT
`INT`	The result of the mathematical expression as an integer.	INT
`BOOL`	The result of the mathematical expression as a boolean value.	BOOLEAN

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Outputs