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The inch-centimetre relationship (1 in = 2.54 cm) has been the exact international definition since 1959.
170 cm = 5 feet 6.93 inches. Formula: 170 ÷ 2.54 = 66.93 inches total, then 66.93 ÷ 12 = 5 feet remainder 6.93 inches.
5 ft 7 in = (5×12 + 7) × 2.54 = 67 × 2.54 = 170.18 cm.
6 feet = 72 inches × 2.54 = 182.88 cm.
The US retained imperial units after independence. Most other countries switched to metric in the 18th–20th centuries. The US remains one of three countries not officially using the metric system.
170 cm equals 5 feet 6.93 inches, commonly written as 5 feet 7 inches. This is an average adult height in many countries.