Pregnancy Wheel For Ipaq Has Anyone Found A Good, Reliable And Downloadable Program That Will Act As A Pregnancy Wheel Calculator?

Has anyone found a good, reliable and downloadable program that will act as a pregnancy wheel calculator? - pregnancy wheel for ipaq

I have an iPAQ 4350 with Windows operating system. I need the computer to accept the three main methods of calculation (ie the transition from the PML, the United States first, and the estimated age of the Gest)