1 g/mL equals exactly
1 kg/L
The gram per milliliter (g/mL) and the kilogram per liter (kg/L) are numerically identical, because both units maintain the same scale ratio: 1 liter contains 1,000 milliliters, and 1 kilogram contains 1,000 grams, so the two scale factors cancel each other out.
To convert a measurement from g/mL to kg/L, the numerical value does not change:
Likewise, to convert from kg/L to g/mL:
g/mL is common on chemical and liquid food product labels (especially in laboratory contexts), while kg/L is more used in industrial and commercial settings for liquids sold in large quantities (fuels, oils, bulk chemical products). Knowing they are numerically equivalent greatly simplifies reading technical data sheets from different sources.