According to the Akita Breed standard:
The male Akita should measure between 26-28" at the withers and typically weighs between 100-115 pounds.
The female Akita should measure between 24-26" at the withers and typically weighs between 75-90 pounds.
Like people, some dogs are taller and some are shorter, weigh more or less. This is a guideline given by the Akita Standard. You can read the full Standard here: