National Metric Week

National Metric Week is observed next on Sunday, October 5th, 2025. It was observed for 5 days starting Monday of the second full week in May from 1976 until 1977. It was observed for 5 days starting Monday of the first full week in May from 1978 until 1980. It was observed the second full week of May from 1981 until 1983. It has been observed the week including October 10th since 1983.

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