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As per the 2018 report issued by the Centers for Disease Control and Prevention (CDC), the mean height for men in the United States stands at 175.4 centimeters, approximately equivalent to 69.05 Inch. Similarly, the average height for women is recorded at 161.7 centimeters, roughly corresponding to 5 feet and 3 1/2 inches.
| cm | inches | meter | feet |
|---|---|---|---|
| 638 cm | 251.18 inch | 6.38 m | 20 ft |
| 639 cm | 251.57 inch | 6.39 m | 20 ft |
| 640 cm | 251.97 inch | 6.4 m | 20 ft |
| 641 cm | 252.36 inch | 6.41 m | 21 ft |
| 642 cm | 252.76 inch | 6.42 m | 21 ft |
| 643 cm | 253.15 inch | 6.43 m | 21 ft |
| 644 cm | 253.54 inch | 6.44 m | 21 ft |
| 645 cm | 253.94 inch | 6.45 m | 21 ft |
| 646 cm | 254.33 inch | 6.46 m | 21 ft |
| 647 cm | 254.72 inch | 6.47 m | 21 ft |
| 648 cm | 255.12 inch | 6.48 m | 21 ft |