I weigh all calorie dense food esp nuts. I find that I often under estimate the weight if I just eye ball it. With cheese though I always over estimate and I am always surprised at how much 25g of cheese actually is! When i used to do low carb, I used to eat nuts by the handful and now when I weigh it and see how much calorie it has, I dont wonder anymore why i wasnt losing weight with low carb!
I had 3g of macadamia and according to my fitnesspal 21 calories!! what??? that's crazy!! and delicious!! but mostly crazy!