Milk Weight & Density Calculator

Calculate milk density, specific gravity, and convert between litres and kilograms using composition.

Inputs

Milk type preset:

Milk fat (%)

Whole cow: 3.5–4.5%; Jersey: 4.5–5.5%; Buffalo: 6.5–8.0%

SNF (%)

Solids-not-fat. Cow: 8.5–9.0%; Buffalo: 9.0–9.5%

Conversion

Milk volume (litres)

Enter milk batch volume in litres

Density at 20°C—

Specific gravity (SG)—

Total solids—

Weight from volume—

Enter milk fat and SNF to calculate density and convert.

Formula & Method

Density of milk from composition, based on the volumetric mass of each component:

ρ_milk = 100 / (F/0.93 + SNF/1.610 + W/1.000)

ρ_milk	Density of milk at 20°C, g/mL (numerically equal to kg/L)
F	Fat content, %
SNF	Solids-not-fat (protein + lactose + minerals), %
W	Water content, % = 100 − F − SNF
0.93	Density of milk fat at 20°C, g/mL
1.610	Density of SNF (anhydrous), g/mL
1.000	Density of water at 20°C, g/mL

Specific gravity (SG) is dimensionless: density of milk ÷ density of water. At 20°C the numerical values are practically identical. Source: Walstra et al., Dairy Science and Technology; Bylund, Tetra Pak Dairy Processing Handbook.