Free, runs entirely in your browser — no sign-up, no file upload to a server.
What does Column & Gutter Calculator do?
It calculates a column's width from the container size, number of columns, and gutter spacing.
How accurate is the result?
It calculates directly from the numbers you enter using standard formulas, so the result is only as accurate as the inputs provided.
Is my data sent anywhere?
Everything runs in your browser — nothing you type or paste is sent to a server.
How do I report a problem or request a feature for this tool?
Use the Contact / Feedback page — select "Column & Gutter Calculator" as the related tool so we know exactly which tool you mean, then describe the bug or the feature you'd like to see.