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In the early 1960s Frank Drake setup an equation to estimate the number of communicative extraterrestrial civilizations in the Milky Way galaxy. This page has a calculator you can use to find what number of civilizations to find with your own thoughts and figures.
More to read about Drake's equation at Wikipedia:
It's now the year 2019 and it's 58 years since Frank Drake setup the equation. We know much more now and can use that knowledge to get a better number of the civilizations out there.
Search for extraterrestrial intelligence, SETI:
If you find searching for other other intelligent civilizations out in space exciting maybe you find this movie interesting:
Type in your data
It start to calculate as soon you change or write new figures in the white or dark red boxes. Do not exceed the maximum number of characters, delete characters if necessary.
How to interpret the results ? If N = 1 or less, then only we exists just now in the Milky Way galaxy. If N is higher than 1 we have neighbours out there.
Illustration of low and high N. If the N value get low, don't forget that there are billions of galaxies out there.
Are we alone or not ? According to some, if aliens are as we are and want to explore the surroundings. It will take as short time as 50 millions year to explore the whole Milky Way galaxy, if that's true we should already had a visit from aliens. One problem as for human species, human will probably not last more then 300'000 years and we already used up 100'000 of those years. Other species will take over as the evolution goes on, on the other hand, maybe we take control of the evolution if we want that.