The return value of methods that are not "raw" is formatted to ###.##

Getting free memory

boolean inPercentage == return value in percents

double getFreeMemory(boolean inPercentage)
double getRawFreeMemory(boolean inPercentage)

Getting used memory

boolean inPercentage == return value in percents

double getUsedMemory(boolean inPercentage)
double getRawUsedMemory(boolean inPercentage)

Getting maximum memory

double getMaxMemory()

Examples

double maximum = MemoryAPI.getMaxMemory();
double used = MemoryAPI.getUsedMemory(false);
double free = MemoryAPI.getFreeMemory(false);

String text = used + "/" + free + "MB ("+maximum+"MB)";