At 500kHz there is no attenuation, at 1MHz there is 50dB attenuation, and above is another 30dB per octave (octaves would be 2MHz, 4MHz, 8MHz, etc). That means that 2MHz has about 80dB attenuation, 4MHz has about 110 dB attenuation, 8MHz has about 140dB attenuation, etc. I did not use an online calculator specifically designed for this to get the values but had to use the Desmos graphing calculator with hand crafted equations (equations that are mainly other equations patched together and trial and error to find new equation components) to get the capacitor and inductor values.
