# Cost of Blueprint Research is different for similar BPs - why?

**URL:** <https://forums.eveonline.com/t/cost-of-blueprint-research-is-different-for-similar-bps-why/481709>\
**Category:** Science & Industry\
**Created:** [March 31, 2025, 3:01pm UTC](https://forums.eveonline.com/t/cost-of-blueprint-research-is-different-for-similar-bps-why/481709 "2025-03-31T15:01:08Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Elathy\_Maricadie](https://sea1.discourse-cdn.com/eveonline/user_avatar/forums.eveonline.com/elathy_maricadie/32/379496_2.png) [@Elathy\_Maricadie](https://forums.eveonline.com/u/Elathy_Maricadie)\
**Post date:** [March 31, 2025, 3:01pm UTC](https://forums.eveonline.com/t/cost-of-blueprint-research-is-different-for-similar-bps-why/481709/1 "2025-03-31T15:01:08Z")

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Can anyone explain to me why research costs of similar Blueprints can have huge variations even though the BPs are similar - same cost to buy off market, same location, same current ME/TE research - yet the PTV (Process Time Value) is calculated differently?

![image](https://global.discourse-cdn.com/eveonline/optimized/4X/e/2/8/e28e739190d36f19f6755288b3672fcedc12392d_2_690x34.png)  
 ![image](https://global.discourse-cdn.com/eveonline/optimized/4X/9/b/1/9b1a8ab9f27c13047ff612b4c41590f37ab06788_2_690x33.png)

Yet here is their PTV calc (TE +2):

 ![image](https://global.discourse-cdn.com/eveonline/original/4X/d/3/b/d3b707788eb377535bd7cc94e2a37896c5fdbc43.png)  
 ![image](https://global.discourse-cdn.com/eveonline/original/4X/2/c/a/2ca07f677fbe63e211120162e82b25c9c1553c42.png)

How can one PTV be higher than the other?

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**Author:** ![Innocent\_Mind](https://sea1.discourse-cdn.com/eveonline/user_avatar/forums.eveonline.com/innocent_mind/32/480932_2.png) [@Innocent\_Mind](https://forums.eveonline.com/u/Innocent_Mind)\
**Post date:** [April 1, 2025, 12:59pm UTC](https://forums.eveonline.com/t/cost-of-blueprint-research-is-different-for-similar-bps-why/481709/2 "2025-04-01T12:59:26Z")

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Material price and quantity isn’t the same.

Process time value=Base duration\_n×0.02105×∑all materials Material quantity×Material adjusted price

Edit: source is Eve uni → research-\> cost of research

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**Author:** ![system](https://global.discourse-cdn.com/eveonline/original/3X/4/1/41ec4921cbaca7a6f9ea556e7cc20018461eae5e.png) [@system](https://forums.eveonline.com/u/system)\
**Post date:** [June 30, 2025, 12:59pm UTC](https://forums.eveonline.com/t/cost-of-blueprint-research-is-different-for-similar-bps-why/481709/3 "2025-06-30T12:59:33Z")

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