Not all calculators require an adaptor, as some are designed to only run on batteries. However, some calculators, particularly more advanced models that have a lot of features and functions, may drain batteries quickly or may require a lot of power to operate. In such cases, a power adaptor can be a useful accessory to have. To find a power adaptor for your calculator, you will need to know the make and model of your calculator. You can then search for a compatible adaptor online or at a store that sells calculators and accessories. Make sure to check the voltage and polarity requirements of the adaptor to ensure that it is compatible with your calculator. It is important to note that not all calculators use the same type of power adaptor. Some may use AC adaptors, while others may use DC adaptors. Additionally, the voltage and polarity requirements may vary from one calculator model to another. Always check the manufacturer's specifications to ensure that you are using the correct type of adaptor for your calculator.