📏 Line Spacing Calculator

Enter your x-height and a spacing multiplier (typically 2-3x x-height for comfortable ascender/descender room) to calculate the line-to-line spacing for ruling guidelines.

X-height (mm)

Spacing multiplier

One multiplication, measured baseline to baseline

The spacing is your x-height times the multiplier, and the answer is the distance from one baseline to the next:

line spacing = x-height × multiplier

10 mm × 2.5 = 25.0 mm baseline to baseline

Of those 25 mm, 10 mm is the body of the letters and 15 mm is air shared between the descenders hanging from the line above and the ascenders reaching up from the line below. Drop the multiplier to 2 and that air falls to 10 mm. On an A4 sheet with 20 mm margins the writing area is 257 mm tall, so 257 ÷ 25 leaves room for ten lines at this setting.

Choosing the multiplier

2 to 3 covers most hands. Foundational and uncial sit happily near 2; italic with long ascenders and flourished descenders wants 3 or more before the lines stop colliding.
Set the x-height from the nib first. If your hand calls for an x-height of 5 nib widths and the nib is 2 mm wide, the x-height is 10 mm and this page turns that into 25 mm of ruling.
Mark every baseline before drawing any. Stepping the ruler line by line lets a 0.5 mm error accumulate into visible drift.

The multiplication is exact; what the page can take is not. Wet ink on a soft sheet spreads and shows through from the back, so a spacing that reads fine in pencil can look cramped once inked. Write two trial lines on the real paper before ruling the sheet.

Frequently asked questions

How far apart should calligraphy guidelines be?

Between two and three times the x-height for most hands. At a 5 mm x-height that is 10 to 15 mm from baseline to baseline, and the taller your ascenders the further up that range you should go.

Does the spacing include the letter height?

Yes. It is the whole baseline-to-baseline step, so a 10 mm x-height at 2.5 leaves 15 mm of clear space, not 25 mm.

Can I use a multiplier below 2?

The field allows it and 1.5 will calculate, but at that setting descenders and ascenders overlap. Some display work does this deliberately; for ordinary text it reads as a mistake.