Are autoread calculators legal ?

Been playing online for a while, came across a site which shows an Autored Calculator attached to a game.

All I want to know is if alot of money is won while playing online and poker rooms find out you use a calculator, can they ban your account?

I am thinking of getting one but i need to know that there wont be reprocussions. Any advise? plse

From the http://www.pokerstars.com/poker/room/prohibited/
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In general, what kinds of tools and services are prohibited?
The following types of tools and services are prohibited:

1.Any program that shares hole card data with other players or programs is colluding, and is prohibited.

2.Any program that works off of a central database of player profiles or hands played is prohibited.

3.Any program that plays without human intervention (a 'bot') or reduces the requirement of a human playing. For instance, an 'auto-folder' is prohibited.

4.The practice of datamining (observing games without playing in order to build up a database of hand histories for future reference) is prohibited.

5.Any software that offers direct game play advice on the appropriate action to take, and which is also programmable or configurable beyond a very basic level.
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There are some tools and services which have legitimate uses for analysing your game, but which are not appropriate for use during play. For example, ICM (Independent Chip Model) and Nash Equilibrium tools may be used for post-game analysis and for studying hands which you have previously played. Also, there are some web-based results databases, and its fine to use these to look at your own results. However, you may not use such a tool while the PokerStars software is open.
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Q. Why are there two lists of prohibited tools? What is the difference between them?

A. The first list details tools which are prohibited at all times. None of these tools may be used on your computer, even if not installed on the machine, and even if you do not use them in conjunction with the PokerStars client. PokerStars will take active measures to detect these tools and will take punitive action against players who have them (see 'What steps are you going to take...' below).

The second list details tools and services which may not be used in conjunction with PokerStars or while the PokerStars client software is open. We recognise that these tools have legitimate uses - perhaps for analysing your game or tracking your results - but we feel that they cross the line of what is acceptable for use during play. PokerStars will take measures to detect these tools and will issue warnings to players using them. PokerStars will also work with the developers of such tools to assist them in complying with the rules.

Q. There's a tool / service I'd like to use, but it's not on any of these lists. Now what?

A. Please send an email to support@pokerstars.com with all the information you have about the tool or service in question. Please include a URL to a relevant web page if possible. We will review the tool or service and let you know if it's permitted or not.
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The answer to your other question ... banning your account.

It's not just banning it. If a site decides you took unfair advantage, they will close the account and confiscate the funds.