The project is on such a gigantic scale that the cost is hard to calculate.

工程浩大， 所费不赀。

《新英汉大辞典》

Their cost has risen more than that of other power plants; their scale, complexity and scarcity make it hard to economise.

核电站成本的涨幅比其他发电厂更多；它们的规模，复杂性，和稀有性使得节约成本难上加难。

youdao

Because the problem is not yet reflected in national statistics, its scale is hard to judge.

因为在国家统计数字中还没有反映出问题，很难判断受灾的程度。

youdao

Moreover, there are other elements of his company which are notoriously hard to scale, such as brand experience and customer service.

FORBES: Not So Fast: Stories of Smart, Moderated Business Growth

So I think budget line items and names of things scale easily, but principles scale hard.

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Disappointment at this scale is hard to swallow, but four times?

FORBES: 5 Lessons Learned From Some Of The Best Super Bowls In History: The Agony.The Ecstasy.