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Calcimator

Layer Feed Formulation Calculator

Calculate daily calcium, phosphorus, protein, and metabolizable energy requirements for laying hens based on body weight, production rate, and egg weight.

Inputs

lbs
oz

Results

Calcium Required

4.14 g/day

Available Phosphorus

0.58 g/day

Metabolizable Energy

383 kcal/day

Estimated Feed Intake137 g/day
Crude Protein9 g/day
Diet Calcium3.03%
Diet Avail. Phosphorus0.42%
Diet Crude Protein6.6%
Diet Lysine0.34%
ME for Maintenance281 kcal
ME for Production102 kcal
How to Use This Calculator
  1. Enter the average bird weight in pounds for your laying flock.
  2. Set the production rate as a percentage (e.g., 90 for 90% hen-day production).
  3. Enter the average egg weight in grams — large commercial eggs average 56–63 g.
  4. Review Calcium Required, Available Phosphorus, and Crude Protein to formulate or verify your layer ration.
  5. Use Feed Intake (g) and Metabolizable Energy to balance the diet against your feed ingredients.

How the result changes with Production Rate

Production RateCalcium RequiredAvailable PhosphorusMetabolizable Energy
10%0.84 g/day0.32 g/day293 kcal/day
35%1.94 g/day0.41 g/day323 kcal/day
65%3.26 g/day0.51 g/day359 kcal/day
90%4.36 g/day0.59 g/day389 kcal/day

What each input means

Bird Weight
Average live body weight of the laying hen in pounds.
Production Rate
Hen-day egg production percentage. Peak production for commercial layers is typically 90-95%.
Average Egg Weight
Average egg weight in grams. Large eggs are typically 56-63 g.

What each result means

Calcium Required
Total dietary calcium needed, accounting for absorption efficiency.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    Bird Weight = 4.2, Production Rate = 85, Average Egg Weight = 60 = 3 input(s) provided
  2. Calculate Calcium Required
    Calcium Required
    4.14 = 4.14
  3. Calculate Available Phosphorus
    Available Phosphorus
    0.58 = 0.58
  4. Calculate Metabolizable Energy
    Metabolizable Energy
    383 = 383
  5. Calculate Estimated Feed Intake
    Estimated Feed Intake
    137 = 137
  6. Calculate Crude Protein
    Crude Protein
    9 = 9

Engine last updated . Checked against 1 independently-derived test — how we verify calculators.

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