When looking up domain calculators online, most frequently, a user will find online calculators that will help them find the domain of a given function.

However, what if a user is actually looking for a physical calculator that will help them do this?

Here’s the thing, before you can find a good domain calculator, you need to know what domain is in math.

If you don’t know that, looking online for domain anything can quickly lead you to sites that have to do with website domains – a topic totally unrelated.

We’ve gone ahead and done some of the legwork for you, so let’s talk about what domain in math means.

Then we can talk about a proper domain calculator.

**What is Domain?**

Domain in math can be defined as the set of values for which a __function is defined__. It is also presented as the set of values of the __independent variables__ for which a function or relation is defined. If this sounds a little confusing, here is an even simpler __breakdown__:

“The domain is the set of all possible *x*-values which will make the function ‘work,’ and will output real *y*-values.”

When talking about domain of a function, it is commonly discussed with the range of a function. The range is defined as the resulting *y*-values a person gets after substituting all the possible *x*-values.

When it comes to finding the domain and range of a given function, the easiest way to find these figures it with a calculator. But not just any calculator will do.

**Where to Buy Cheap Domain Calculators Online**

So what type of calculator does a person need when they are working on finding the domain and range of a given function?

Generally, students and professionals will need a graphing calculator.

So instead of looking for a domain calculator, you’ll want to be looking for a graphing calculator. Moreover, with so many different graphing calculators on the market, where should a buyer turn?

When looking for a cheap graphing calculator, it’s often better to shop online as many retailers will offer discounted prices compared to in the store.

So which online retailers have the best prices? Let’s take a look, shall we?

For the purpose of our search, we are going to look for graphing calculators under $50 before shipping and handling and before taxes. Keep in mind, many graphing calculators range in price starting around $100.00 and only going up from there. So, finding a cheap, non-used graphing calculator can be tricky.

While Amazon carries the most variety of graphing calculators for a lower price, users will want to be careful not to simply one-click the cheapest options they find.

Amazon doesn’t always ship from reputable retailers that users are familiar with. This means there is no guarantee that the calculator you’ll receive is new.

On the other hand, if a shopper is okay with a lightly used calculator to use as their domain calculator, then Amazon is a great option for cheaper items.

Walmart offers the second widest variety of cheap graphing calculators before adding on tax and shipping and handling.

By purchasing from a known and trusted retailer such as Walmart, consumers should feel confident that the product they are getting is a new one.

A few options shoppers have for cheap domain calculators include:

Office Depot, also known as Office Max ever since the two companies merged, offers a few different options in graphing calculators, but only one under our set price of $50.00.

That calculator is the Casio® FX9750GII-PK Graphing Calculator in pink.

Target, like Office Depot, Walmart, and even Amazon, offers the Casio fx-9750GII Graphing Calculator under $50.00, but unlike Office Depot, Target offers this graphing calculator in a variety of colors, not just the pink option.

**Free Online Domain Calculators**

While having a calculator on hand to help find domain and range, the internet can be a wonderful tool when in a pinch.

During our research for cheap domain calculators online, we came across a number of free domain calculators that students can use when they don’t have a calculator on hand, or even parents when they need to double check their children’s work and don’t know how to work their kid’s calculators.

Below are only a few of the many domain calculator websites that we found during our research.

This site not only helps users find the domain of a given function, but also the range. The calculator finds the domain of a function by giving up the possible values of independent variables and also finds the possible values of the dependent variable for the range function.

This site helps users to find functions by not only giving them the answer as most online calculators do. This site also shows users the step-by-step work involved in finding the answer. This is useful for not only students who need a little extra help not only finding an answer, but also helps them by explaining how to come to the answer.

This site offers not only solutions to finding the domain of a given function, but it also helps users find the range of the same given function. In fact, it also offers a graph of the domain and range as it would be seen on a graphing calculator.

**Final Thoughts**

When looking for a good domain calculator, there are a number of different factors to consider, and the number one fact is that a graphing calculator is what shoppers are looking for.

With so many graphing calculators on the market, finding one that fits your needs can quickly become overwhelming, especially when it comes to one that fits your budget. If you are investing in a graphing calculator, it is going to be used for more than just finding the range and domain of a given function… So don’t buy one for that simple fact.

When considering a graphing calculator, here is what you should consider:

Once you’ve decided you’ll be using a graphing calculator for more than just a domain calculator, you’ll want to focus on who much you are looking to spend. Graphing calculators can cost well over $100.00. So, before you put down some serious cash, make sure to do your research.

The next thing to be considered is if you plan on getting a new or used calculator. The biggest deciding factor here is whether you’ll be using it frequently or if you only need it for a class or two. If you only plan to use it for a few classes, then it may be better to simply purchase a used calculator from a reputable retailer or even a friend or family member.

This also goes for those not looking to spend an arm and a leg. By buying used, it can ensure that you spend less money overall. If the price isn’t a problem, then many people choose to purchase an all-new calculator simply for the fact that they know they will be getting a product that will not only work but will be around for a much longer period.

When it comes to finding a new, cheap graphing calculator, it’s not so easy. Brick and mortar stores tend to price at face value while online retailers tend to discount items for one reason or another. Back to school sales will see even greater discounts, so don’t forget to check during the month of July, August, and September.

When in doubt, and you know you won’t be needed a fancy graphing calculator long-term, the internet is a great option.

There are countless numbers of domain calculators online that can help get the job done without having to purchase a physical calculator. In fact, there are even online calculator sites that allow users to use virtual graphing calculators. The options are truly endless.

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