Middle Grade, MG or middle grade?

CarpalTunnel

I've heard conflicting information, and would appreciate input...

When writing, say, a query letter, should "Middle Grade" be written:

1. Middle Grade
2. middle grade
3. MG

Thanks!
 

Toothpaste

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I'd write middle grade. I don't think it matters much if it capitalised or not, but don't do MG, just in case whomever you are writing doesn't understand the abbreviations. If you really want to be even more specific:

. . . my middle grade novel for ages 8 - 12 called "Best Book Ever" . . . .