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The Average Cost of a Doctorate Degree. According to the U.S. Department of Education's National Center for Education Statistics (NCES), the average net price of a doctorate degree at a public school in the 2013-2014 school year reached $10,725 each year. Private school tuition during the same year rose to $22,607 annually.
Entering PhD students are assessed $22,880 each semester (fall and spring) during academic years 1-3. The tuition charge for continuing PhD students is $3,162 each semester (fall and spring) during academic years 4+. Tuition charges for part-time master's or continuing studies students is $2,765 per unit or semester hour. Lean more on Duke's graduate school website.