There are different estimates of how many Kurds are in Iran. In the "Routledge Handbook on the Kurds", scholars write that there are about 7 million Kurds in Iran. The Kurdish population is about one tenth of Iran's whole population. In "The Kurds: An Encyclopedia", there scholars write that there are between eight and ten million Kurds in Iran. The Kurdish population is between 11% and 15% of Iran's whole population.