We found that one DNA testing website could tell you how much Irish you are, It is ancestry.com. As you can see below, after sending the test tube to the ancestry.com DNA test lab, you get a result page with the DNA percentages of the populations that have been found in your autosomal DNA. Whatever the lineage, if you have Irish ancestors, you will see the percentage of Irish that you have in your DNA.
To bring this result, ancestry.com compares your DNA to several reference populations and the Irish population is one of those populations. We haven’t found another DNA testing website providing the percentage of Irish DNA. Only Ancestry.com provided this information.