# Damage Modifier Calculation doesn't match **URL:** \ **Category:** New Citizens Q&A\ **Created:** [August 28, 2017, 4:26am UTC](https://forums.eveonline.com/t/damage-modifier-calculation-doesnt-match/20253 "2017-08-28T04:26:21Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Pavel\_Mistery](https://sea1.discourse-cdn.com/eveonline/user_avatar/forums.eveonline.com/pavel_mistery/32/506309_2.png) [@Pavel\_Mistery](https://forums.eveonline.com/u/Pavel_Mistery)\ **Post date:** [August 28, 2017, 4:26am UTC](https://forums.eveonline.com/t/damage-modifier-calculation-doesnt-match/20253/1 "2017-08-28T04:26:21Z")
Hi guys, After some time I have decided to calculate my Damage Modifier of the drone. The drone I have calculated damage for is Imperial Nave Praetor. I have next skills: Heavy Drone Operation 4; Drone Interfacing 3; Gallente Battleship 4; According my calculation I should have next result: 1.68 \* 1.2 \* 1.3 \* 1.4=3.66. In pyfa, I am getting 3.6 as well. However, in the game it shows 3.4. Do I miss something? ---
**Author:** ![Memphis\_Baas](https://sea1.discourse-cdn.com/eveonline/user_avatar/forums.eveonline.com/memphis_baas/32/10413_2.png) [@Memphis\_Baas](https://forums.eveonline.com/u/Memphis_Baas)\ **Post date:** [August 28, 2017, 10:13am UTC](https://forums.eveonline.com/t/damage-modifier-calculation-doesnt-match/20253/2 "2017-08-28T10:13:34Z")
Where is the 1.68 coming from? ---
**Author:** ![Pavel\_Mistery](https://sea1.discourse-cdn.com/eveonline/user_avatar/forums.eveonline.com/pavel_mistery/32/506309_2.png) [@Pavel\_Mistery](https://forums.eveonline.com/u/Pavel_Mistery)\ **Post date:** [August 28, 2017, 11:28am UTC](https://forums.eveonline.com/t/damage-modifier-calculation-doesnt-match/20253/3 "2017-08-28T11:28:29Z")
The basic damage modifier of the drone. ---
**Author:** ![Pavel\_Mistery](https://sea1.discourse-cdn.com/eveonline/user_avatar/forums.eveonline.com/pavel_mistery/32/506309_2.png) [@Pavel\_Mistery](https://forums.eveonline.com/u/Pavel_Mistery)\ **Post date:** [August 28, 2017, 11:36am UTC](https://forums.eveonline.com/t/damage-modifier-calculation-doesnt-match/20253/4 "2017-08-28T11:36:03Z")
It looks like after daily maintenance it is refreshed and shows correct value, according to my calculation. I think there was some delay to refresh the status. The reason I am saying it is that only yesterday, I got new level of Gallente Battleship. So, now it is OK. Ticket can be closed. ---
**Author:** ![Memphis\_Baas](https://sea1.discourse-cdn.com/eveonline/user_avatar/forums.eveonline.com/memphis_baas/32/10413_2.png) [@Memphis\_Baas](https://forums.eveonline.com/u/Memphis_Baas)\ **Post date:** [August 28, 2017, 11:40am UTC](https://forums.eveonline.com/t/damage-modifier-calculation-doesnt-match/20253/5 "2017-08-28T11:40:35Z")
Every now and then someone [reports a discrepancy](https://forums-archive.eveonline.com/default.aspx?g=posts&m=1520313) between the fitting tool and calculated or pyfa/EFT values. ---
**Author:** ![Donnachadh](https://sea1.discourse-cdn.com/eveonline/user_avatar/forums.eveonline.com/donnachadh/32/12629_2.png) [@Donnachadh](https://forums.eveonline.com/u/Donnachadh)\ **Post date:** [August 29, 2017, 1:05pm UTC](https://forums.eveonline.com/t/damage-modifier-calculation-doesnt-match/20253/6 "2017-08-29T13:05:33Z")
In some cases the order you apply bonuses in can and will make a difference especially once you get into modules with stacking penalties so watch that order. It has been a really long time since I looked into this, however if memory serves me well here is the order. Someone please correct me if I am wrong. Skills Ship bonuses Rigs Modules External affects like fleet boost etc When comparing results from different sources rounding errors and other math related things can change the end values slightly. Another factor is the sometimes the math is based on an optimal situation, while other base in on a worse case, and yet others try to use a middle or the road approach. ---
**Author:** ![system](https://global.discourse-cdn.com/eveonline/original/3X/4/1/41ec4921cbaca7a6f9ea556e7cc20018461eae5e.png) [@system](https://forums.eveonline.com/u/system)\ **Post date:** [November 26, 2017, 4:26am UTC](https://forums.eveonline.com/t/damage-modifier-calculation-doesnt-match/20253/7 "2017-11-26T04:26:31Z")
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