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Grass area calculator

Grass Area Calculator

This calculator estimates the grass area needed to feed a dairy herd. The calculator is also useful in demonstrating the effect of the forage yield achieved on the grass area needed, as well as the effect of concentrate level in feeding. 

Enter the initial data or choose from the menus.

  • Number of cows = The average number of cows in the herd
  • Milk production, kg/year= The average milk production per cow in a year
  • Annual replacement percentage of cows. Certain amount of forages will be consumed by heifers. The replacement percentage will change the grass area needed for raising heifers.  It is estimated that 1600 feed units of forage are needed to raise one heifer.
  • Percentage of forage in feeding

  • Yield per hectare, expressed as feed units. This also includes pastures.


The ME (metabolizable energy) requirement for dairy cows is calculated according to the Feed Tables ( In this calculator, the cows are assumed to weigh 600 kg. The calculation covers the whole year including the grazing period.

Thanks to Tapio Pajunpää and Riitta Lehtinen (HAMK University of Applied Sciences/ Mustiala) for the draft of this calculator. 

Number of cows
Milk production, kg/year
Annual replacement percantege of cows
Percentage of forage areal in arable land
Feed unit yield per hectare


Time to assess silage quality
Careful sampling is a prerequisite of reliable analysis results
Silage analysis statistics updated monthly
Reports of composition and quality of over 100 000 grass silages made in Finland
Interested in pasture grass or silage raw material quality?
Grass analysis provides the answer

The XVI International Silage Conference was held in Finland on 2-4 July 2012. Check materials in web!
A video clip shows silage sampling on a Finnish dairy farm
Go to YouTube
Updates in official Finnish energy and protein values into use 1 September 2010
Details available in the Feed Tables - web service which is now available in English!
Process your own information based on research results
Doctoral dissertations in Finland related to forages and/or cattle
Links divert to whole texts which are available in English