How much to feed?

So the breeder I got my snake from feed him 1 fuzzy rat once a week. I can not find any stores that sell them or a seller near me. The breeder also said that he would take two fuzzy mice as a substitute. Does this sound correct? I just want to make sure that I'm not over/under feeding.

He was hatched in 2015. I'm not sure on exactly when.

If you know what the snake weighs, you can feed it a Mouse that weighs about 10% to 13% of the snake's weight.

Example- if the snake weighs 40 grams, you would feed a 4.5 to 5 gram mouse.
If the snake weighs 100 grams, you would feed about a 12 gram mouse.
And if the snake weighs 300 grams, you could feed a 30 to 35 gram mouse.

You can also feed a Mouse, Rat, Chick, etc. that is slightly larger than the biggest part of your snake. If your snake is about 1 inch diameter at his biggest part, you could feed something about 1 to 1-1/2 inches in diameter.

Yes, you can feed 2 smaller items to equal 1 bigger item if the bigger items can not be found. But you don't want the 2 items to exceed 10% to 13% of the snake's weight weekly.

Once the snake is full grown (several years old and over 300 grams) a single mouse of about 30 to 35 grams every 14 days is usually recommended to maintain a healthy weight without the snake getting too fat.