As you know Windows 7 contains a new redesigned Calculator which has new GUI and new options. You can get more information about it in following topic:
What’s New in Windows 7: A Small Review with Screenshots
If you can't use Windows 7 but like the new Calculator, then you can get the same calculator in Windows XP.
"grdcityboy" has created a small application which looks very similar to Windows 7 Calculator:

Its fully functional but only "Standard" mode works because of limitations.
You can download it using following link:
Download Windows 7 Calculator for Windows XP
NOTE: You'll need to install Microsoft .NET Framework to be able to use this app.
This article was posted by VG in following section: Windows XP.
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David
Thanks a bunch Vishal. May God Bless you and your family. :)
hotchap
when r u releasing updated version of SevenVG Black Theme for Windows XP ? I am waiting...
memonio
gooday Vishal:
when I apply your tweaks these work properly because these have been well designed and coded, thinking more in performance than interface.
For this reason we use them; but please be careful with mods made from others. they are unstable and we want your work because we can rely on it.
this is one example
Joji
It doesn't seem I have windows calculator my MS XP...
Will this download screw up my system if I download it since I don't have a "calculator" on my computer?
~Joji~
VG
^^ You can install it without any worries.
keshav
thanks a lot man, that really help me. Please inform me if u got some new tricks...
Shikhar01
Hey Vishal,
I've created a calculator that resembles windows 7 one.
It works in scientific mode also.
I've coded it in visual basic 2010.
You can visit my blog at deviantart to have a watch.
And I would be happy it you post it here as a replacement to this one.
The deviation is titled as "Win7 Calculator for XP, Vista by ~Shikhar01"