Estimate how long a fill lasts and how quickly you work through bottles based on your writing routine.
Time per fill
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Enter pen capacity, writing volume, and bottle size to estimate pages per fill and refill cadence.
Tap an example to prefill the calculator with sample values.
Everyday note-taker
Standard converter and office-week usage
A normal converter can disappear faster than expected once you write a few pages on most workdays.
Result: A typical converter fill can run out in under a week of steady note-taking.
Heavy journaler
Large pen with broad nib and daily writing
Wet nibs and long journaling sessions burn through fills quickly even when the pen holds more ink than a converter.
Result: Heavy daily writing often means measuring refill cadence in days, not weeks.
Occasional pocket pen
Lighter usage and fewer writing days
Moderate page count and fewer writing days stretch a small fill much farther than most enthusiasts expect.
Result: Lighter, less frequent writing can make even a small pocket fill last multiple weeks.