Tohoku and Kanto regions have many of the existing sangaku and the prefecture that has the largest number of sangaku is Fukushima Prefecture with 103 sets, followed by Iwate Prefecture with 93 sets, Saitama Prefecture with 91 sets and Gunma Prefecture.
現存する算額は関東地方や東北地方が多く、もっとも多いのが福島県の103面、次いで岩手県93面、埼玉県91面、群馬県などとなっている。