Centimeters	Inches
15-20 cm	5.9-7.8 in
18-23 cm	7.0-9.0 in
20-25 cm	7.8-9.8 in
22-27 cm	8.6-10.6 in
25-30 cm	9.8-11.8 in
28-33 cm	11.0-12.9 in
30-35 cm	11.8-13.7 in
32-37 cm	12.5-14.5 in
35-40 cm	13.7-15.7 in
38-43 cm	14.9-16.9 in
40-45 cm	15.7-17.7 in
42-47 cm	16.5-18.5 in
45-50 cm	17.7-19.6 in
48-53 cm	18.8-20.8 in
50-55 cm	19.6-21.6 in
52-57 cm	20.4-22.4 in
55-60 cm	21.6-23.6 in
58-63 cm	22.8-24.8 in
60-65 cm	23.6-25.5 in
62-67 cm	24.4-26.3 in
65-70 cm	25.5-27.5 in
68-73 cm	26.7-28.7 in
70-75 cm	27.5-29.5 in