Calculate energy-corrected milk from milk and component percentages or masses, or solve for milk, fat or protein mass. Use lb, kg, g or mg; choose the protein basis and optionally divide the period yield by its number of days.

Use milk, fat and protein yields for the same period. Choose the protein basis from your laboratory report; ECM is an adjusted yield, not measured calories or a feeding recommendation.

The coefficients are different conventions. This selector does not convert one protein measurement into the other.

Optional settings

Optional. Blank uses 1 day; only the per-day result changes.

Energy Corrected Milk (ECM) Formula

Use k = 7.2 with crude protein or k = 7.65 with true protein, matching your laboratory report. These are equation conventions, not interchangeable protein measurements. Milk, fat and protein masses must cover the same period. ECM is an adjusted mass yield, not milk calorie content or a feed recommendation.

ECM = 0.327 × M + 12.95 × F + k × P

Variables:

  • ECM is the energy-corrected milk yield; all masses use the same unit (lb, kg, g or mg).
  • M is the milk weight (lbs) 
  • F is the fat weight (lbs) 
  • P is the measured protein weight (lbs), with the selected true or crude basis.

How to Calculate Energy Corrected Milk (ECM)?

The following steps outline how to calculate the Energy Corrected Milk (ECM).

  1. First, determine the milk weight (lbs).
  2. Next, determine the fat weight (lbs). 
  3. Next, determine the protein weight (lbs). 
  4. Next, gather the formula from above = ECM = 0.327*M + 12.95*F + k*P.
  5. Finally, calculate the Energy Corrected Milk (ECM).
  6. After inserting the variables and calculating the result, check your answer with the calculator above. 

Example Problem:

Use the following variables as an example problem to test your knowledge.

milk weight (lbs) = 50

fat weight (lbs) = 1.9 (3.8% of milk mass)

crude protein weight (lbs) = 1.6 (3.2% of milk mass)

With crude protein, ECM = 0.327 × 50 + 12.95 × 1.9 + 7.2 × 1.6 = 52.475 lb. If the period is two days, ECM/day = 26.2375 lb/day. Inverse modes rearrange the same selected equation and reject negative component yields or fat plus protein exceeding milk mass.