Sometimes you need a certain amount of starter and you know the feeding proportion, but how much do you need to add to the container of starter, flour and water. Well, the math is simple, but this is even simpler.

Just type in your desired weight and select the feeding proportion and you’ll have the answer.

(The numbers are rounded to whole number, so you can weigh them correctly on your scale. If 1g is missing to get to the desired weight, it’s added to or removed from the starter, so the hydration stays the same)