The difference is 0.5 cm, 44 is 27 cm, 43 is 26.5 cm, so the difference is 0.5 cm.
Size 44 refers to the European size, the Chinese shoe size corresponds to 27cm, and size 43 corresponds to 26.5cm. The Chinese shoe size is recorded in centimeters, which refers to the length of the foot (the length from the heel to the toe). That's the inside length of the shoe.
The 42-size foot is 10-10.5cm wide, and the 43-size foot is 10.5cm wide, so the foot width is also 0.5cm different.
It's 0.5 cm big.
The difference between size 43 and size 44 is 5mm.
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For men's shoes:
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The 43 shoe size is 275 mm, and the 44 shoe size is 280 mm. So the difference between 43 and 44 shoe sizes is 280-275=5 mm.
How much bigger is a size 44 shoe than a size 43 shoe? It's 0.5 cm big. Because the formula for calculating shoe size is foot length times two minus ten. So the inside length of a size 44 shoe is 27 centimeters, and the inside length of a size 43 shoe is 26.5 centimeters. Because 27 cm x 2=54 cm, 54 cm -10=344 yards. Likewise 26.5 cm x 2=53 cm, 53 cm -10=43 yards. So a size 44 shoe is 0.5 cm larger than a size 43 shoe.