SamplingPercentToSigma - ComfyUI Built-in Node Documentation

The SamplingPercentToSigma node converts a sampling percentage value to a corresponding sigma value using the model’s sampling parameters. It takes a percentage value between 0.0 and 1.0 and maps it to the appropriate sigma value in the model’s noise schedule, with options to return either the calculated sigma or the actual maximum/minimum sigma values at the boundaries.

Inputs

Parameter	Description	Data Type	Required	Range
`model`	The model containing the sampling parameters used for conversion	MODEL	Yes	-
`sampling_percent`	The sampling percentage to convert to sigma (default: 0.0)	FLOAT	Yes	0.0 to 1.0 (step: 0.0001)
`return_actual_sigma`	Return the actual sigma value instead of the value used for interval checks. This only affects results at 0.0 and 1.0. (default: False)	BOOLEAN	Yes	-

When return_actual_sigma is enabled, a sampling_percent of 0.0 returns the model’s maximum sigma value (sigma_max), and a sampling_percent of 1.0 returns the minimum sigma value (sigma_min). For all other percentages, the result is the same whether or not the option is enabled.

Outputs

Output Name	Description	Data Type
`sigma_value`	The converted sigma value corresponding to the input sampling percentage	FLOAT

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