There are many different types of calculators available, from simple handheld devices to complex software applications. The type of calculator you need will depend on the complexity of the mathematical operations you need to perform. For simple operations, a basic handheld calculator will suffice. For more complex operations, you will need a more sophisticated calculator, such as a scientific calculator or a graphing calculator.

There are also many different calculator apps available for your smartphone or tablet. These apps range from simple to complex, and can be a great way to have a calculator handy when you need it.