Drop in the ocean, i think total US aid over the last year is over GBP70Bn.
About these aid sums, some of that aid isn't actually going to Ukraine.
What I mean is that if the US sends say 100.000 shells of artillery ammunition to Ukraine, it will be from their storage and they will send the oldest ammunition first. Then the replacement of that ammunition with new shells to top up the stocks is paid for by the aid budget.
But the value of shells nearing their best before date is not the same as the cost of buying new shells. So only a part of the earmarked money can be said to actually go to Ukraine.
The US also sends things like M113 APCs. They have a lot in storage, but they are so old, that they were not really expecting to ever use them in combat themselves anymore. What is the real value of vehicles like this? For these reasons, military aid is difficult to put a value on.
Also going forward it will make sense that each country gives what they are good at. There was recently some news about US 155mm shell production and how it was not enough to cover Ukraine's needs. But why would the US even need to provide bulk 155mm shells - they can send speciality ammunition. The EU already has much more artillery shell production capacity sitting around that the US. Even Australia's capacity is about the same as the US peacetime production volumes.
Also, the cost of producing shells in say the Czech republic is less than in the US because salaries are lower.
On the other hand there is a lot of aid given directly as money in order to prevent Ukraine from going bankrupt and there is a lot of humanitarian aid as well + in Europe the costs of welcoming Ukranian refugees. None of these factors are very easy to directly compare against each other.
There are also factors, like that the US will probably make the money spent on sending HIMARS back over time, because everyone else (not literally but you get the point) wants to buy HIMARS now too.
So I think the sums announced are rather meaningless in the end, especially if we want to use them to compare countries to each other, which is also of questionable value in the end.
But until now it has probably served to pressure countries giving aid into making sure they are doing their part.