Question 1

What is a ken?

Accepted Answer

A ken is a traditional Japanese unit equal to about 1.82 meters (6 shaku). Used to measure room dimensions and tatami mats.

Question 2

How do ken relate to tatami mats?

Accepted Answer

A standard tatami is 1 ken × 0.5 ken (1.82m × 0.91m). Room sizes are often described in tatami count (jo): 6-jo room = 9.72 sq m.

Question 3

Is this conversion factor exact?

Accepted Answer

Metric-to-metric conversions are exact (1 km = 1000 m). Imperial-to-metric factors like 1 inch = 2.54 cm are exact by international agreement.

Question 4

Why do some countries use different units?

Accepted Answer

Historical reasons - the metric system spread from France after 1795. The US, UK, and a few others retained older systems. Science uses metric worldwide.

ken to m Converter

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