It depends what you’re investing in. On a lot of investment platforms you can start with as little as 10€, on others, the minimum is higher. It’s still worth investing even before you really have savings because you’re learning something that will reap rewards for your entire lifetime. You'll start wanting to budget for the month factoring in money to grow your investments month on month, year on year. Even if you don’t have savings to invest now, learning the habits and psychology of investing will encourage you to save money. I have my 7-year-old investing money he has from the tooth fairy for exactly that reason! Of course, the more money you put in the more you stand to earn but it’s a myth that you need to have a lot to start investing. The important thing, by far, is just to start.