You can check with a local Realtor. They have access to comparable sales and can give you a pretty good idea what homes are worth in your area.There are many different online value estimators that are free, another source is a program made available through the government that generates the house value based on historical appreciation rates in your area.
To get a general idea of your home's value you can use an online value estimator. Online value estimators can provide you with a general idea as to the value of your home on paper. These should not be construed as an appraisal report or a true value of your home, but can usually provide a basic idea of your home's value.
If you are unsure of the value and it is crucial that you need find out an accurate amount, hiring a professional appraiser is possible as well. This can be the most expensive option, but also the most accurate.