Free Butterfat Price Adjustment Calculator
Adjust a milk price for the fat actually delivered versus your contract reference, valued against the live butter market. Enter your prices for an instant result.
Contract terms
Butter market price
Sets the value of each butterfat point.
Vesper tracks daily spot prices for EU dairy markets, updated every trading day.
Start a free trial to access live data directly in this calculator.
Each kilogram of fat is valued at 1.22 times the butter price (82% butterfat).
Your adjusted milk price
butter-equivalent methodAdjusted milk price
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per 100 kg milk
Want the live butter price for an exact adjustment?
Vesper tracks daily EU butter spot prices, forward curves, and forecasts. Price your fat differentials against the real market every day.
How the calculation works
How does butterfat price adjustment work?
Most milk contracts quote a base price at a reference fat content and adjust up or down for the actual fat delivered. Each percentage point of fat above the reference adds the value of that extra butterfat (priced from the butter market); fat below the reference subtracts it.
How is the butterfat value derived?
One kilogram of milk fat yields about 1.22 kg of butter (butter is 82% fat). The calculator values each kilogram of fat at 1.22 times the butter price, so a higher butter market lifts the value of every fat point.
What reference fat should I use?
Use the reference stated in your supply contract. EU contracts commonly reference 4.0% or 4.2% fat. The adjustment is the difference between your actual fat and that reference.
Does this include protein?
No. This tool isolates the butterfat component. For the protein side, use the Protein Price Differential calculator, which values protein against the SMP market.