How many cups is 100g of macadamia nuts?

100g of macadamia nuts (macadamias) is

¾ cup

That's 0.75 US cups, 0.71 metric cups, or 12 level tablespoons.

Worked out from 1 US cup = 134g. Cups are rounded to the nearest kitchen fraction, with what's left over in level tablespoons. If you have scales, weighing is more accurate.

Other amounts of macadamia nuts

200g: 1½ cups
250g: 1¾ cups + 2 tbsp
1 cup: 134g
Half a cup: 67g
A quarter cup: 34g
1 tablespoon: 8.4g
Full table for macadamia nuts

Where these numbers come from

USDA FoodData Central, SR Legacy, food 12131: “Nuts, macadamia nuts, raw”. USDA lists these household measures for it:

1 cup, whole or halves = 134g
1 oz (10-12 kernels) = 28.35g

Fractions of a cup are the cup weight scaled down. The tablespoon figure is the cup weight divided by 16, since USDA doesn't list a tablespoon for this ingredient. The teaspoon is a third of the tablespoon. Metric-cup figures assume a 250ml cup, and Australian tablespoons hold 20ml. Weights under 10g are rounded to 0.1g, everything else to the nearest gram. Full source list.