Manure Nutrient Value Calculator

N-P-K value from manure type and application rate.

Manure type

Application rate (tons/acre)

Field size (acres)

Excess moisture (%)

N price ($/lb)

P₂O₅ price ($/lb)

K₂O price ($/lb)

Tab to move between fields

Fertilizer value ($/acre)

$38.25

≈ 8 cups of coffee

Value per ton of manure ($)

$7.65

≈ 2 cups of coffee

Available N (lbs/acre)20

Available P₂O₅ (lbs/acre)17

Available K₂O (lbs/acre)36

Total N applied (lbs/acre)50

N value ($/acre)$11.00

P₂O₅ value ($/acre)$11.05

K₂O value ($/acre)$16.20

Total manure needed (tons)50

Total field value ($)$382.50

How to Use This Calculator

Select Manure Type (Dairy, Beef Feedlot, Swine, Poultry Litter, or Horse) to load typical nutrient values.
Enter the application rate in tons/acre or tons total.
Review Nutrient Value ($/ton) and Total Value ($) — this is what you save on commercial fertilizer.
Check N Availability (lbs/acre) separately from total N — only a fraction is plant-available in the first year.
Compare P₂O₅ and K₂O applied per acre against your soil test recommendations to avoid over-application.

How the result changes with Application rate (tons/acre)

Manure type: 1 = Dairy, 2 = Beef feedlot, 3 = Swine, 4 = Poultry litter, 5 = Horse.
Application rate (tons/acre): Tons of manure applied per acre (as-is weight).
Field size (acres): Total acres to receive manure.
Excess moisture (%): Additional moisture above book values (dilutes nutrients). 0% = typical moisture.
N price ($/lb): Commercial nitrogen price per pound.
P₂O₅ price ($/lb): Commercial phosphate price per pound.
K₂O price ($/lb): Commercial potash price per pound.

Fertilizer value ($/acre): Total nutrient replacement value per acre.
Value per ton of manure ($): Economic value of each ton of manure.
Available N (lbs/acre): Plant-available nitrogen in the first year.
Available P₂O₅ (lbs/acre): Plant-available phosphate in the first year.
Available K₂O (lbs/acre): Plant-available potash in the first year.
Total N applied (lbs/acre): Total nitrogen applied (including unavailable fraction).
N value ($/acre): Dollar value of nitrogen per acre.
P₂O₅ value ($/acre): Dollar value of phosphate per acre.
K₂O value ($/acre): Dollar value of potash per acre.
Total manure needed (tons): Total tons of manure for the entire field.
Total field value ($): Total nutrient replacement value for the whole field.

Identify Input Parameters
4 parameters
Manure type = 1, Application rate (tons/acre) = 5, Field size (acres) = 10, Excess moisture (%) = 0 = 7 input(s) provided
Calculate Fertilizer value
Fertilizer value = nValue + pValue + kValue
38.25 = $38.25
Calculate Value per ton of manure
7.65 = $7.65
Calculate Available N
Available N = totalNPerAcre * manure.nAvail
20 = 20
Calculate Available P₂O₅
Available P₂O₅ = pPerTon * applicationRate * 0.85
17 = 17