Sold (not sale) price – Paid price = Capital gain
Then are things you can also subtract, like major improvements to the property, fees associated with selling the property, etc.
Here is a link for a list and more helpful information
When did you purchase the property and what costs were associated to the sale of the property? I can provide you with an estimate with this information but you are going to be best suited by contacting a CPA, whom is familiar with real estate transactions.