Check out FitDay.com and you can look these things up.
Brazil nuts, 1c shelled (32 kernels), 918 calories. 1 oz is 186 calories. 1 oz is often used as a "serving" size, and when dieting, 1/2 oz may be more appropriate for some. By the above numbers, 1 oz is about 1/5c, so say ~1.5T (which is a lot less than 1/4c = 4T)
You'll have to take a handful, then use a measuring cup to tell you how much a "handful" is for you. Measuring by handfuls can be tricky. The amount you take tends to creep up and up. Measuring with a measuring cup at first is probably a good idea. I'm not measuring constantly and not calorie counting anymore, but I needed to for a while to learn a new "normal." And even then it's not for everyone. Many will always measure and count. But not all of us