“On a scale of one to five, I'd give it a four.”

English Lesson: On a scale of one to five, I'd give it a four.

You went to watch a movie last weekend. You're talking about it with a friend, who asks what you thought of the movie. You liked it quite a bit, so you rate it this way.

On a scale of one to five, I'd give it a four.

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(rate something) on a scale of (a number / a number to a number)

When people give something a number rating, they usually have an idea of what the top possible rating is. For example, you might rate something a "6" with the idea that the top possible rating is "10". That top value defines the "scale" of the rating. So you can say:

I'd rate it 6 on a scale of 10.

or

On a scale of 1 to 10, I'd rate it a 6.

The most common scales are one to three, one to four, one to five, one to 10, and one to 100.

I'd give it a (rating)

When you're rating how good something is, you can say what rating, grade, or score you "would give" it:

I'd give it a three out of ten.

I'd give it a B+.

I'd give it two stars.

Why do we use "would" in this expression? Imagine that part of the sentence is left out:

I'd give it a three out of five (if I were rating it formally).