1. Go one size bigger. -- This is the most accurate answer to your question.
2, can also have other answers, such as how many centimeters, millimeters and so on. But it wasn't one of your questions. But still give you the following shoe size comparison table: Standard generic size comparison table
New shoe size -- old shoe size
38 -- 24.0cm
39 -- 24.5cm
40 - 25.0厘米
41 -- 25.5cm
42 -- 26.0cm
43 -- 26.5cm
44 -- 27.0cm
45 -- 27.5cm
46 -- 28.0cm
3. According to your question, it is true that size 44 shoes are 1 size bigger than size 43 shoes! If you want to ask how big it is, it is 0.5cm. Men's shoes size 43 is 26.5cm, size 44 is 27cm.
Normally, a size 44 shoe is not much bigger than a size 43 shoe. Generally about 0.5~0.8cm. The inside of the shoe is about the same size. The outside looks bigger.