How to Substitute Instant Yeast for Active Dry Yeast . According to Nathan Myhrvold, author of Modernist Bread and bread-baking expert, you can use a few simple equations to convert one style of yeast into another. However, instant yeast doesn’t have to be proofed first. It can last for many years, just as instant yeast does. Let’s take it like this: active yeast needs to be dissolved before using it, instant yeast is poured directly into dry ingredients. Instant yeast, also known as fast-rising, rapid rise, quick rise and/or bread machine yeast, is a clone of yeast with slightly different attributes than good-old active dry yeast.It absorbs water a bit quicker so the little yeast … Active dry yeast is also available in vaccum sealed packages, usually in 2 pounds. Both yeast are “active… Instant yeast dissolves faster and activates quicker than other types. Instant yeast can be added directly into your dough, well, instantly, while active dry yeast needs to be dissolved in water and activated. Instant yeast is a different type of yeast that is made with a similar process as active dry yeast. That’s the main difference between the two. Bread machine yeast is instant yeast that is specially formulated. If you only have active yeast and the recipe requires instant yeast… “If you have instant yeast, but need active dry, simply multiply by 1.33; if you have active dry yeast, but need instant… The difference is actually that the instant yeast is a fine grain, hence no need to predispose it.