Calculator
How ink usage is estimated
Ink consumption in calligraphy depends on four main factors: the number of characters, the font size (which grows quadratically), the absorbency of the paper, and the formulation of the ink. This calculator combines these into a practical estimate so you can plan your project and budget before dipping your pen.
What affects ink consumption
Font size
When you double the font size, the ink usage roughly quadruples. This is because ink covers area, and area scales with the square of linear dimensions.
Paper type
- Smooth paper (coated, Bristol): ink sits on the surface, uses ~15% less
- Standard paper (bond, cartridge): baseline
- Absorbent paper (watercolor, rice paper): ink spreads into fibers, uses up to 50% more
Ink type
- Dye-based: thin, flows easily, baseline consumption
- Pigment-based: thicker particles, ~10–15% more ink per stroke
- Waterproof / India ink: dense, covers more, uses ~20% more
How to use this calculator
- Count the total characters in your project (letters, spaces excluded).
- Enter your intended font size in millimeters (x-height or cap height).
- Choose the paper type you'll write on.
- Select the ink type you're using.
- Enter your bottle size and price to see cost per project.
Frequently asked questions
How much ink does a wedding invitation need?
A typical wedding invitation with a couple's names, date, and venue — about 80–120 characters at 6–8mm font size — uses roughly 0.3–0.6 mL of dye-based ink. In practice, you'll dip your pen 30–60 times.
How many pages can one 30 mL bottle cover?
A 30 mL bottle of dye-based ink on standard paper can cover roughly 40,000–60,000 characters at 8mm font size. That's equivalent to 80–120 typical wedding envelopes or 30–50 full pages of dense text.
Does ink go bad?
Yes. Most calligraphy inks last 2–4 years unopened and 6–18 months once opened. Pigment inks tend to separate and need shaking. Store bottles upright, away from direct sunlight, and check for mold or unusual odor before use.
Why does my ink run out faster than estimated?
Common causes: absorbent paper, heavy pressure, a broad or flexible nib, or a thick ink that leaves more residue on the nib. If you're doing a large project, always buy one extra bottle.