ComfyMathExpression - ComfyUI Built-in Node Documentation

The ComfyMathExpression node evaluates a mathematical formula that you write as text. The formula can reference the node’s input values using letter names such as a, b, c, and you can add as many input values as needed through the growable values group. The calculation result is returned simultaneously as a floating-point number, an integer, and a boolean value.

Inputs

Parameter	Description	Data Type	Required	Range
`expression`	The mathematical formula to evaluate, written as text (for example `a + b`), using the letter names of the input values as variables. Multiline input. (default: “a + b”)	STRING	Yes	N/A
`values`	Growable group of input values that provides the variables for the expression. Each value added to the group automatically gets the next lowercase letter name starting at `a` (`a`, `b`, `c`, …), and that name can then be used inside `expression`. Each item accepts a number (INT or FLOAT) or a boolean (TRUE/FALSE).	FLOAT, INT, BOOLEAN	Yes	1 to 26 values, named `a` to `z`

Notes and constraints

expression cannot be empty or contain only whitespace.
The expression must evaluate to a numeric result (INT or FLOAT). If the result is a different type, such as text, the node raises an error.
The numeric result must be finite and convertible to a float. Results that are too large or non-finite cause an error.
The whole set of input values is also available inside the expression under the variable name values (as a list), so expressions such as sum(values) are possible.
The following math functions are available inside the expression: sum, min, max, abs, round, pow, sqrt, ceil, floor, log, log2, log10, sin, cos, tan, int, float.

Outputs

Output Name	Description	Data Type
`FLOAT`	The result of the expression as a floating-point number.	FLOAT
`INT`	The result of the expression converted to an integer, with the decimal part truncated.	INT
`BOOL`	The result converted to a boolean value: TRUE when the numeric result is not zero, FALSE when it is zero.	BOOLEAN

This documentation was AI-generated. If you find any errors or have suggestions for improvement, please feel free to contribute! Edit on GitHub

Source fingerprint (SHA-256): 4c77e9834fe7341143352f95ed8808dc81def3361b197c67e33a531bb3696d71

​Inputs

​Notes and constraints

​Outputs

Inputs

Notes and constraints

Outputs