Japan Guide - Measurements
The Japanese electric current is 100V AC, which is found almost nowhere else in the world. To make it more confusing, Tokyo and eastern Japan are on 50Hz, and western Japan (including Nagoya, Kyoto and Osaka) is on 60Hz. Most North American electrical items, designed to run on 117V, will work reasonably well on the Japanese current. Japanese plugs are flat two pin, identical to North American plugs, however you’ll need a transformer to safely use any foreign appliances.
Japan uses the international metric system except when measuring the size of rooms. In this case, the measurement is made by how many tatami mats or 'jo' fit into the space. If you’re not confused already, a tatami mat in Tokyo (1.76m by .88m) is smaller than a tatami mat in Kyoto (1.91m by .96m).
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