The density of dry granulated sugar is close enough to the density of water that the choice of units doesn't matter. Pounds , kilograms, quarts, gallons, liters, measure the sugar and the water the same way and the result will be fine.
It is also reported that you can take any convenient container, make a mark partway up the side, such as to leave headspace for stirring. Fill to the mark with sugar, Add hot water and stir, adding hot water as necessary until the solution is up to the mark. When finished the solution will be about two to one. This method depends on the fact that the sugar and water molecules fit together somewhat in the solution, and thus the volume of the solution is less than one would first guess.
lots of bakeries will g ive away the buckets that frosting come in. the 1 gallon buckets are ideal for measuring syrup ratios.
spring I bucket water+ 1 bucket sugar
fall I bucket water + 2 buckets sugar
winter candy I bucket sugar + 1 quart water