Many times on a home inspection I will find a 100 amp electrical service. Many of my clients ask if this will be enough of a service for their home. Well, the answer is relatively simple.
The average American household will usually not exceed 60-80 amps during peak usage. So what does that mean? For the most part, we can run the microwave, have lights on, rune a computer, and watch TV with relatively no issue (unless you are trying to get all that power from one or two circuits of course).
Where a problem comes in is when we start to throw pools, custom computers, specialty equipment, or power tools in the mix. If you have anything over the typical household devices in your home, you may start to need a little extra amperage. But for the most part, 100 amps is more than enough for most homes.