How many GB in 1 terabyte? The answer is 1024. We assume you are converting between gigabyte and terabyte. You can view more details on each measurement unit: GB or terabyte The main non-SI unit for computer data storage is the byte. 1 byte is equal to 9.3132257461548E-10 GB, or 9.0949470177293E-13 terabyte.