Universal syrup calculator

Weight of pre-existing sugar in juice

Weight of juice without pre-existing sugar

Amount of sugar needed for 1:1

Amount of sugar needed for 2:1

Originally created by Jeffrey Morgenthaler and licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License. Only the question wording has been amended. Jeffrey's original blog post can be found here and the original calculator can be found here.