The Treasury Return Calculator below uses long run 10-year Treasury Data from Robert Shiller to compute returns based on reinvesting the coupon payments. You can see the total returns for the 10 Year Treasury for any arbitrary period from 1871 until today. Growth Calculator. Feel free to change the default values below. Then, click the "calculate" button to see how your savings add up! For more information, click the instructions link on this page. This calculator is for estimation purposes only. How to Calculate the Value of a Treasury Note. Treasury notes offer twice-annual coupon payments for two, three, five, seven or 10 year terms. When the note matures at the end of the term, the face value of the note is paid to the investor. You can purchase Treasury notes at face value, pay a premium or purchase the