Even-Spacing Calculator

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Case

Span in

Number of items

Item width in — 0 for points/pins

End margin in — Case C only

Choose your case, enter the span and count, then press Calculate.

From the book — Chapter 4. Case A (points): gap = span ÷ (n − 1). Case B (items, gaps at the ends too): gap = (span − n×width) ÷ (n + 1). Case C (items, fixed end margins): gap = (span − 2×margin − n×width) ÷ (n − 1).

The fence-post trap — span ÷ n — is exactly what these three cases correct. Everything stays in your browser — no sign-up, nothing stored.