How to convert dB SPL to regular computer volume dB?

I found my headphones' frequency response graph, but it showing dB SPL, is it possible to convert it to "regular" volume dB? There is no more information aside from dB SPL/Frequency Hz graph.

I want to set up a system-wide equalizer to compensate for that curve, so it would give me flat frequency range. I need it for mixing and mastering my music.

[Mario Malic]

SPL is the sound pressure level measured in dB, which is probably the thing you are looking for.

Without mentioning what is the reference value, dB can mean anything, as it's just a ratio between actual value and reference value (of power or pressure, etc.)

[Jonas]

if you find out which reference value is used for your 'regular' dB you could calculate your 'regular' dB volume from dB SPL. e.g. if your regular volume uses just 1 as reference you can convert dB SPL to regular dB by adding 20*log10(20*10^-6) dB to the dB SPL

[John Doe]

Quote from the site I got frequency response curve:

"The Panasonic RP-HJX5 frequency response curve provided is raw, non-averaged, non-compensated."

[Jonas]

sounds like the reference value is 1 in this case. actually it is not that important, you can compensate if you have the curve, if the reference values differ there will just be a constant offset