When using a scale to weigh ingredients (such as 2 tsp sugar) you will be given a measurement in decimals (1.2 oz, 0.9 oz, 4.67 oz etc)
The only way to truly get accurate results in large scale baking and cooking is, of course, by weighing exact measurements from the original recipe to scale up and not "round up or down" However as great of a design this is, they forgot to allow this so taking a recipe for a product 17 oz jar to a kettle fit for a crowd via starting with the weights isnt possible. I like this layout better but I have to use another app to calculate my conversions as this one forgot that scales that chefs use have decimals. However if you only use tsp, T and standard cups and not weights it works well Unfortunately, chefs do use weights in order to scale up accurately for large scale baking.
Artistalana about Serving Sizer recipe converter, v2.0.2