You can calculate Zakah by filling out values in the Zakat Forms as per the instructions provided. You can use any one of the calculators as per your choice.
ISLAMIC INHERITANCE CALCULATOR
QIBLA POINTER FROM ANYWHERE IN THE WORLD
PRAYER TIMES FOR 6 MILLION CITIES WORLDWIDE (1)
FREE ONLINE TRANSLATIONS ALL LANGUAGES(1)
FREE ONLINE TRANSLATIONS ALL LANGUAGES(2)
FREE ONLINE TRANSLATIONS ALL LANGUAGES(3)
NINETY NINE (99) NAMES OF ALLAH (SWT) – (1)
NINETY NINE (99) NAMES OF ALLAH (SWT) – (2)
PROPHET MOHAMMAD (SAWS) SUPPLICATIONS (DUA)
Meanings of the names have been provided. But it is difficult to guarantee the accurate meanings. Therefore, it is a good idea If you consult a prominent Shaikh for verification before deciding to keep a name of your baby.
Uganda Muslim Brothers and Sisters(UMBS) Marhaban مرحبا 
This is an amazing post. I was just searching for Zakat calculator but, I have found here so many useful links. Would love to study and apply them.
Allah Akbar