След следните сметки:
1 count = 1/4 US fluid ounce (вж. линка по-долу)
1 US fluid ounce ~ 30 ml

http://www.barmixmaster.com/2005/08/measuring-pour.html
Here's how it’s done. The first thing you have to do is condition yourself to know how long it takes to pour 1 1/2 ounces (a typical shot). To do this start with filling an empty bottle with water and attaching a pouring spout. Then take a 1 1/2 ounce jigger in one hand, stand over a sink, and pour the water into the jigger while counting in this fashion... 1 and 2 and 3 and 4... you should get to 6 just as the water starts to pour over the top of the jigger. Practice this about a dozen times until you feel like you have the timing right. (3)
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That's it! Now you can free pour a 1 1/2 ounce shot. Practice often and don't just assume that you will stay accurate you should test yourself at least once a week. Of course once you have become decent at it you can just test yourself as you are making a drink with real alcohol. No need to drag out that bottle of water.

You say that you don't always need a 1 1/2 ounce pour? No problem. For a 1 once pour, just count to 4, for half an ounce, just count to 2. Basically what you have is 1/4 ounce for each count. There are very few recipes that will call for a liquor pour of less than 1/4 ounce increments.
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У нас състава на коктейлите го дават в г/мл и т.н.
Съответно 3 Count (Sweet & Sour Mix) ще бъде 3х22,5 мл = 67,5 мл

Давам confidence "high", защото съм сигурна в смисъла, но не знам дали българските коктейл-майстори го практикуват и как му викат. Вижте линка и ще разберете какво имам предвид.

Без да омаловажавам информацията, намерена и посочена от 4leavedClover, предлагам като вариант, използван в България.
http://gotvarstvo.georgievi.net/a/mohito

Моето предложение е да преведат и двете(shot и count)-дози или мерки и да се даде обяснение под черта каква е равностойността в милилитри за двете.

http://www.mahmurluk.com/2008/06/blog-post_8749.html
http://freezingblue.com/iphone/flashcards/printPreview.php?f...
http://en.wikipedia.org/wiki/Shot

Shot-Mixed drink shooters and drink shots, a one-to-four-ounce alcoholic beverage
Shot glass, a liquor measure

Всъщност в български се използва и шотове, т.е shots да се преведе като шотове, а count-доза например.

http://www.barmagazin.net/index17.html