Future value is how much an asset will be worth at some date in the future based at the rate of it’s appreciation or depreciation.
Present value is how much that asset is worth to day.
Interest is the rate at with the asset will increase or decrease in value over each period.
Number of periods is how many periods in the future you want to calculate.
Example: If you have an asset worth $1,000 today that is expected to decrease in value by 7% each year and you want to know what it will be worth in five years then you would enter the following values:
Present Value: 1000
Interest: -7
Number of Periods: 5