DetermineRowsAndCols

DetermineRowsAndCols is the smallest node in the ComfyUI WPX Nodes pack, and it doesn't touch a single pixel. It's a pure arithmetic utility: you tell it roughly how many rows and columns you'd like, and how many items you actually have, and it returns the grid dimensions that fit. No image in, no image out - just two integers. It exists to answer the question the pack's other nodes keep making you answer by hand: "I have 10 stickers, what rows × cols grid should I use?"

How it works

The logic is deliberately simple, and reading the three cases tells you exactly what it's doing. With your two guesses (num1, num2) and the real count (total_count):

• If num1 × num2 would be a perfect square equal to total_count, it returns a square grid.
• Otherwise, if a num1 × num2 rectangle is large enough to hold total_count, it returns the wider layout - (max, min).
• If even that's too small, it just returns max × max, which over-provisions rather than under-fits.

In practice: feed it "around 3 × 3, and I have 10 elements" and it hands back the Rows and Cols that actually fit. It's not clever, and it doesn't need to be.

The inputs

Three INTs:

• num1 (default 2) and num2 (default 2) - your preferred rows and columns guesses.
• total_count (default 10) - how many cells/elements you actually have.

Outputs: Rows and Cols, both INT. That's the whole node.

Where it slots in

The natural target is PenetrateStyle, which takes rows and cols for its sticker-sheet layout - wire these two outputs straight into those inputs and you stop doing grid math in your head. It's also handy for any image-grid or batch-arrangement node that takes explicit rows and columns. That said, it's a thin utility with a narrow job. If you only ever arrange grids by hand, skip it; if you're building a reusable workflow that others will load, a node that computes the grid beats asking people to read your mind.

Installing

ComfyUI Manager → search "ComfyUI WPX Nodes" → install → restart. Manual:

cd ComfyUI/custom_nodes
git clone https://github.com/WangPengxing/ComfyUI_WPX_Node
# restart ComfyUI

No models, no dependencies beyond what the pack already needs. The one real install note is pack-wide: the pack imports rtree and scipy at startup, and if either is missing, none of the eight WPX_Node nodes appear - including this one. pip install rtree scipy and restart.

Gotchas

Honestly, there's not much to troubleshoot here - it's three integers and an if-statement. One expectation to set: it's a quick heuristic, not a layout optimizer. If your num1/num2 guesses are wildly off, it can return a grid that's larger than you wanted, and it has no sense of aspect ratio. It picks a fitting shape, not a pretty one. For that role, it's fine - and it's about as simple as a node gets.