Read this article if you want to understand the dynamic of Coronavirus

Synthesis

Country Current death toll Estimed final total deaths toll
Italy 6,077 About 10,000
Spain 2,207 Between 5,000 and 10,000
France 860 Between 5,000 and 10,000
US 520 Between 2,000 and 10,000
UK 335 Between 2,000 and 10,000

To come to those conclusions, we use the following figures (Taken from worldometers) :

To help us, we also use the following curves: (Updated on the 22nd of March)

Italy

Very good news: it seems that Italy is really under control now.

It may even converge around 10k. It's not sure that it will cross the 10k line which is a good news for every one: no country should be worst than Italy

So the final number of deaths should be around 10,000.

Spain

Spain curve looks just behind Italy. An inflexion seems to appear as it has crossed the 1k line.

So it may not reach the 10k line.

So the final number of deaths should be between 5,000 and 10,000.

France

The curve still looks linear, we don't see any inflexion yet.

So it's impossible to know where it will converge. However, since France has taken its lockdown decision 3 days after Spain, we can speculate that inflexion will appear in 1 or 2 days.

And since France had less deaths on the lockdown day, we can speculate that it will have less deaths than Spain.

So the final number of deaths should be somewhere between 5,000 and 10,000.

US

US is even more complex because it's a collection of 50 states.
There is no global lockdown yet, but more and more states have begun to declare lockdown.
It's really difficult to read a dynamic in the US curve, it will cross the 1k line.

However, the good news is that it should not be worst than Italy.

So the final number of deaths should be somewhere between 2,000 and 10,000.

UK

UK has not declared lockdown decision yet but is enforcing rules for people.

As US, we can speculate that it should not be worst than Italy.

So the final number of deaths should be somewhere between 2,000 and 10,000.