Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
 noun One that calculates, as.
 noun An electronic or mechanical device for the performance of mathematical computations.
 noun A person who operates such a machine or otherwise makes calculations.
 noun A set of mathematical tables used to aid in calculating.
from The Century Dictionary.
 noun One who calculates, computes, or reckons.
 noun One who estimates or considers the force and effect of causes with a view to form a correct estimate of the effects.
 noun A calculatingmachine.
 noun A form of orrery invented by Ferguson.
from the GNU version of the Collaborative International Dictionary of English.
 noun One who computes or reckons: one who estimates or considers the force and effect of causes, with a view to form a correct estimate of the effects.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun A
mechanical orelectronic device thatperforms mathematical calculations .  noun dated A person who performs mathematical
calculation  noun A person who
calculates (in the sense of scheming).  noun obsolete A
set of mathematicaltables .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 noun an expert at calculation (or at operating calculating machines)
 noun a small machine that is used for mathematical calculations
Etymologies
from Wiktionary, Creative Commons Attribution/ShareAlike License
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Examples

In reality punching a few numbers into a calculator is free and buying a bunch of high end rifle rounds can be VERY expensive.
Greenhill Formula 2009

The fare calculator is actually a carryover from the old site — but it is a lot easier to locate on the new one.

This free poker odds calculator is very simple tool to find out what were your odds of winning.
Learn How to Play Texas Hold’Em Poker From the Pros  Poker Hands 2009

You've accidentally entered a rate of 200% because the calculator is poorly coded.
Bubbles and Macroeconomics, Arnold Kling  EconLog  Library of Economics and Liberty 2009

IMPORTANT: The Free Retirement Analysis, although more accurate than a retirement calculator, is still not as accurate as a comprehensive retirement plan.

However, as a guideline, your poker calculator is going to have the exact odds, and correct mathematical indication served up for you, David Sklansky style.
Poker Calculators and The Sklansky Group Hand Rankings  Poker Hands 2010

In reality punching a few numbers into a calculator is free and buying a bunch of high end rifle rounds can be VERY expensive.
Greenhill Formula 2009

If you can remember where this mythical calculator is and how to turn it on, you're not drunk enough to need it.
Hangover Cures: Myth, Legend, Fact  Lifehacker Australia 2010

By the way, CNN's Delegate calculator is the coolest!
Superdelegate deluge 2008

Same here Ilker, as soon as counting gets complicated, my calculator is out.
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