How to Play on a 1 inch = 10 feet square grid.

I am the DM for a table top “Storm King’s Thunder” campaign. The final battle map is drawn in the book with one square = 10 feet. I usually draw the map on my battlemat with each 1 inch square = 5 feet. But this is such a large playing field that it won’t fit on my table at that scale so I am drawing it with 1 inch = 10 feet. I have occasionally done this before, but adjusting movements and attacks have always been a hassle. In anticipation of a large complicated battle I came up with this set of house rules.

To play with miniatures on a square grid where each square on the grid represents 10 feet:

Scale
Start with the rules in Variant: Playing on a Grid (PHB, page 192). Change “Each…