What is 1500 milliliter in kg?

Answer 1

1500 mL = 1.500 L = 0.001500 kL (kilo Litre) (= 1.500*10-3 kL)

and/or:

1500 mL = 1500 cm3= 1.500 dm3= 1.500*10-3 m3

Answer 2

That depends upon the density of the substance:

weight = volume x density
= 1500 ml x density

with density measured in kg/ml.