Most major sport footwear retailers use the USA size, but then Malaysian used to follow UK size.
Example: If you are a men's size 8, your actual size in Nike shoes will be: USA 9, UK 8, EUR 42.5, CM 27
The "cm" system is based on the length of your foot in centimeters, so you may find it useful to measure your foot in cm and find your size this way.
How to measure your feet?
Place a piece of blank white paper on a hard floor.
Stand on the paper wearing a sock of medium thickness.
Holding a pencil vertically, place a mark at the end of your heel.
Place another mark at the tip of your longest toe.
Mark the sides of your foot at the widest part.
Measure your other foot using the same method.
To find your size, measure the heel-to-toe mark in centimeters.
For example, if you are a man and your foot measures 28 cm long, you will wear a size USA 10, UK 9, EUR 44, CM 28 shoe.
If your measurements are between two sizes, or you find one foot's measurement larger than the other, always move up to the larger size.