The best help in the conversion of units to fluids, for density and viscosity.

Density

Tons per cubic meter (t/m³)
kilogram per cubic meter (kg/m³)
gram per cubic meter (g/m³)
milligram per cubic meter (mg/m³)
kilogram per liter (kg/L)
gram per liter (g/L)
milligram per liter (mg/L)
kilogram per cubic centimeter (kg/cm³)
gram per milliliter (g/mL)
pounds per cubic yard (lb/yd³)
pounds per cubic foot (lb/ft³)
pounds per gallon (US) (lb/gal)

Viscosity

Centipoise (cP)
Gram per centimeter second (g/(cm•s))
Kilogram per metre second (kg/(m•s))
Newton second per square metre (N•s/m²)
Pascal-second (Pa•s)
Poise (P)
Pound-force second per square inch (lbf•s/in²)
Pound-force second per square foot (lbf•s/ft²)
Pound per foot second (lb/(ft•s))
Pound per foot hour (lb/(ft•h))
Slug per foot second (slug/(ft•s))
Dyne second per square centimetre (dyn•s/cm²)