How many bees exist in the world? The answer is: It's impossible to know the exact number.
Not only is the data sparse, but it varies by time of year, weather and climate conditions and many other factors.
The answer also depends on how you define “bees” — whether you’re talking about Apis mellifera (the honey bee) or if you want to include other species of bees across the world.
However, we can try to get to an estimate. Let's start with the number of domesticated beehives in the world. There are between 80 and 100 million domesticated honey bee hives. Each hive has between 10,000 to 60,000 bees. So that gets us up to between 1 and 5 trillion.
Now we have to add in the feral colonies of bees that exist in the wild. Experts give varying estimates--it could be as high as 900 million or as low as 400 million. Now you are taxing my math skills, but it comes out to between 40 trillion to 100 trillion honey bees in the wild.
So let's just say about 100 trillion honey bees exist in the world.