如意算盘的英文：
[Literal Meaning]
as one wishes/abacus
to calculate with an abacus as one wishes

[解释]
从个人的愿望出发，只做好的打算。

[Explanation]
to plan or act only based on one's own wish

[例子]
你可真会打如意算盘！明明只上了十五天的班，却要一个月的工资。

[Example]
You are really calculating with an abacus as you wish! Obviously you have worked for only fifteen days but demand for a month's salary.

[英文等价词]
wishful thinking

George counts his chickens before they are hatched.
乔治打如意算盘。

Don't count your chickens before they are hatched
不要打如意算盘

Is this what you call counting your chicken before they are hatched?
这就是所谓蛋未孵出先数鸡(打如意算盘)吗?