1. Calculator NounComputer, Estimator, Figurer, Reckoner  
An expert at calculation (or at operating calculating machines).  شمار کنندہ / کیلکولیٹر 
Expert  a person with special knowledge or ability who performs skillfully.  
 
2. Calculator NounCalculating Machine  
A small machine that is used for mathematical calculations.  حساب لگانے والی مشین 
Abacus  a calculator that performs arithmetic functions by manually sliding counters on rods or in grooves.  

Useful Words
Calculating, Calculative, Conniving, Scheming, Shrewd  used of persons; "the most calculating and selfish men in the community".
Calculation, Computation, Computing  the procedure of calculating; determining something by mathematical or logical methods.
Expert  a person with special knowledge or ability who performs skillfully.
Auto, Automobile, Car, Machine, Motorcar  a motor vehicle with four wheels; usually propelled by an internal combustion engine; "Get your car fixed".
Mathematical  of or pertaining to or of the nature of mathematics; "a mathematical textbook".
In Operation, Operating, Operational  being in effect or operation; "de facto apartheid is still operational even in the `new' African nations".
Belittled, Diminished, Small  made to seem smaller or less (especially in worth); "her comments made me feel small".
That  referring to the farther one; "That`s the way".
Secondhand, Used  previously used or owned by another; "bought a secondhand (or used) car".