Hi Lily, this is a roadblock for any baker because there are, unfortunately, no universal weights set for flour by volume. So for King Arthur's bread flour, you're correct that our recipes are written for one cup of our bread flour to weight 120 grams. 

Following other recipes though, go with the weight measurement rather than volume. The volume difference just means that when they measure their bread flour by volume, they pack it down more densely into the cup than we do. 

A gram is always a gram, so you'll be fine no matter what. If the recipe you're using only lists volume measurements, see if you're able to find a description of the way they measure their flour. Fluffing it up and scraping the excess, scooping, spooning it into the cup, etc. so you can try to get the most accurate results. 

Use 500 grams for the recipe you're making. 

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