YOU SAID:

doubling up the amount i'm putting in.

INTO JAPANESE

私は量を倍増入れています。

BACK INTO ENGLISH

I doubled up the amount.

INTO JAPANESE

量を 2 倍に。

BACK INTO ENGLISH

The amount doubled.

INTO JAPANESE

その倍かな

BACK INTO ENGLISH

the amount is doubled.

INTO JAPANESE

その倍かな

BACK INTO ENGLISH

the amount is doubled.