The very small 'Mini Calculator' has been updated to version 184.108.40.206.
This very small freeware is a very unobtrusive calculator for your desktop, being - maybe - the smalest Windows calculator on the market! And it's FREE! It has a "paper clip" where it shows you all calculations (with the option to save all to disk for future reference) and also has a bunch of scientific functions on the side, among other little things.
As always, this and all other freeware is available from the freeware webpage, so... why not test it?