Does the standard "save 15%" include Roth IRA?

I lump summed my Roth IRA ($7500). And I am able to put a chunk of my paycheck (pre tax) into my 401(a). The 401(a) contributions + the 7500 from the Roth is approximately 15% of my yearly salary before tax. Is this standard? Or should I be investing 15% of my paycheck outside of my Roth, so my 401(a) + taxable = 15%? Thank you