Explaining the cost of waiting to someone just starting out
If you are trying to explain to someone, a teenager, a new graduate, a friend just starting their first job, why they should not put off investing, a lecture about compounding usually does not land. A real number does.
The idea is simple enough to say in one sentence: waiting to invest has a cost, and that cost is bigger than it feels. The tool above turns that sentence into something the person you are talking to can actually see. Pick a contribution they could realistically manage, even a small one, and set the delay to a few years. Show them the gap.
What tends to land is not the total balance at the end. It is watching the gap between starting now and starting later grow wider the further out you look. That visual argument usually works better than any explanation of interest rates or growth curves.
You do not need to get every detail right to make the point. The exact contribution amount or rate matters less than the shape of the idea: time is doing real work in the background, whether or not you are paying attention to it.
Returns are never guaranteed and can lose money in some years. This is not financial advice, for you or for whoever you are showing it to. It is simply a way to make an abstract idea concrete enough to actually change someone's mind.