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Which pens do you have that use the most ink? Which pens do you have to refill the most often? Also, the inverse. Which pens do you have that use the least amount of ink? For me, the answers would be a VERY wet Jinhao X450 for the most ink using pen, and a Platinum Standard PTL-5000a XF for my most efficent pen.

Hello all! I recently purchased my very first fountain pen - a Pilot Metropolitan Fine nib. I've had it for 2 days. It's been lovely. (Translation: I can feel my hand after writing a English essay) Anyways, I did some calculations for ink usage that I figured would be worth sharing. Any input you can give me on the accuracy of my calculations is very much welcome! I'm going into college in the fall, and have therefore calculated based off of a college schedule (not including holidays, in-semester-breaks, etc.) of 15 weeks, or 75 days. Over estimation is better than under estimation! Based on some research (thanks FPN), I have selected the values of 1 cartridge/day and 0.5 cartridge/day as reasonable - 1 c/d for super-heavy-totally-overestimating calculations and 0.5 c/d for more reasonable light note taking. If anyone wants to know the specific math I used, just speak up. Double the numbers for the whole, two-semester school year. These calculations are based on the Amazon price for Pilot Namiki 0.9 mL black cartridges at $5.03 for a pack of 12, but with the numbers provided you could calculate based on other cartridges. If you wanted to, you could probably calculate this in mL for bottled inks, but I'm really trying to not get into bottled inks for a while - no way my mother would let me buy bottled. Cartridges per semester: - Maximum usage (1 c/d) = 75 cartridges - Reasonable usage (0.5 c/d) = 37.5 cartridges Packs per semester: - Maximum usage (1 c/d) = 6.25 packs (round to 7) - Reasonable usage (0.5 c/d) = 3.125 packs (round to 4) Cost per semester: - Maximum usage (1 c/d) = $35.21 - Reasonable usage (0.5 c/d) = $20.12 As a bonus, I calculated the approximate cost differential between fountain pen ink and Frixion pen ink (second favorite pen, behind my FP) as 29.5% more per mL. I've got a full 12 pack now, so I'm fine and dandy till the end of this semester, even if I'm using nearly 1 cartridge a day (most likely not) so it's not that big an issue. I want to purchase ink enough for a semester BEFORE said semester, so I'm trying to math my way into reasonable number of packs to buy in August-ish. What do you think of my projections? Are they on the nose or wildly inaccurate? I really really don't want to overstock or worse, under stock. Thanks!