How to use Child support calculator?

https://www.facebook.com/childsupportcalculatorandguidelines
How to use Child support calculator?
Child Support Calculator provide an approximate of child support payment based on your inputs such as each person's income. Please remember that these calculators are for informational and educational purposes only. The amount of child support a court will order for any particular case may be different from the amount estimated by the calculator. This child support calculator is based on statutory guidelines. The court has the final authority to determine the amount of child support awarded.