Hot or Not? Find Out How to Calculate Component Heat and Why You Shouldszczys writes "Calculating the heat of your electronic components is not hard. But you've got to know where to look in the datasheets for the values, and how to plug them into a simple equation. Bil Herd just posted a video that walks you through the process. He ices the cake with a way to calculate how much more reliable your parts are if properly cooled.