Manure Value Per Ton Calculator

Manure is fertilizer you already own: every ton carries nitrogen, phosphorus and potassium that would otherwise come out of a fertilizer budget. This calculator prices those nutrients per ton at three levels of detail, from a quick NPK analysis to a market run with your own prices and transport cost, so you can judge what a load is worth before you spread it, sell it or haul it across the county.

One warning belongs at the top. The Basic and Advanced tabs price nutrients at fixed built-in rates (nitrogen $0.74/lb, phosphorus $0.73/lb, potassium $0.41/lb, sulfur $0.35/lb) refreshed to September 2026 Extension-derived prices, as dated in the formulas section below. Fertilizer prices move with energy markets, so treat the built-in tabs as a fast estimate and use the Market Pricing tab with current local prices for any decision that involves money changing hands. Sulfur is the exception: no current Extension sulfur quote was found, so its $0.35/lb figure is retained from the earlier set and is the first number to replace with a local quote.

Quick Answer

How to use the manure value calculator

Pick the tab that matches the data in your hand. Each tab is pre-filled with its own worked example, and the results stay hidden until you click Calculate.

1. NPK Analysis (Basic) is the fast estimate: total N, P2O5 and K2O in pounds per ton, plus the manure type. Use it for a first pass on a lab report or a book value.
2. Advanced Nutrients is for a full lab report: it adds ammonium nitrogen and sulfur, and splits nitrogen the Extension way. Enter organic nitrogen (total N minus ammonium N) in the first field and pick the manure source for its year-1 mineralisation rate; the application method then acts on the ammonium pool only. The two available pools are added together.
3. Market Pricing is the decision tab: your own per-pound nutrient prices and your hauling cost per ton, ending in a net value that can go negative, which is sometimes the most useful answer on the page.
4. Read the whole result: the headline value, the nutrient breakdown, the formula panel showing each multiplication, the economic analysis paragraph and the value assessment band, then copy or share it from the buttons under Calculate.

For a livestock operation weighing manure against its other margins, the per-ton figure slots straight into enterprise budgets such as the dairy farm profit calculator, where manure is either a fertilizer saving or a saleable product depending on the farm’s land base.

The three formulas, and the prices inside them

Every tab prices nutrients the same basic way, pounds times price per pound, following the fertilizer replacement method set out in University of Missouri Extension’s manure valuation guide (G9330). The tabs differ in what gets discounted and what gets subtracted.

The built-in prices deserve scrutiny, because they are the single biggest assumption in the first two tabs. The table below sets them against the Extension worked examples they were derived from, with the arithmetic shown so you can check it. The spread against older examples is the point: there is no stable “price of nitrogen” to hard-code, which is why this page prints the assumption in the calculator instead of burying it.

For scale: the old built-in set was $0.65 N, $0.55 P2O5 and $0.45 K2O from 2024 averages, and an older University of Nebraska worked example priced nitrogen at $0.63/lb from urea. Prices have moved since both, which is exactly why the Market tab takes your local quotes. Local quotes decide; the Market tab is where they belong.

Worked examples for all three tabs, verified against the tool

Each tab is pre-filled with the example for its own mode, so pressing Calculate on a fresh page reproduces these figures exactly.

Basic, dairy solids: 10 lbs N, 6 lbs P2O5, 8 lbs K2O. Gross value = (10 × 0.74) + (6 × 0.73) + (8 × 0.41) = $7.40 + $4.38 + $3.28 = $15.06. Dairy-solid availability is 85%, so the value is $15.06 × 0.85 = $12.80/ton, rated Low Value by the tool’s assessment bands.

Advanced, incorporated immediately, standard source: organic N 10 lbs, ammonium N 4 lbs, P2O5 8 lbs, K2O 12 lbs, sulfur 2 lbs. Available N = (10 × 0.39) + (4 × 0.95) = 3.90 + 3.80 = 7.70 lbs, worth $5.70. Add P $5.84, K $4.92 and S $0.70 for a total of $17.16/ton, rated Moderate Value. Note what the arithmetic now does: the available nitrogen (7.70 lbs) is below the organic input alone, because only part of the organic pool mineralises in year 1. That is the Extension split working as intended, and it replaces the old method, which credited the organic pool at up to 95%.

Market, own prices and a haul: 10 lbs N, 8 lbs P2O5, 12 lbs K2O at the built-in prices entered as market prices, with $5/ton transport. Gross = $7.40 + $5.84 + $4.92 = $18.16; net = $18.16 − $5.00 = $13.16/ton, with transport eating 27.5% of the gross value.

The fall-surface check row is restated with full inputs in this refresh: the old row gave only the two nitrogen fields, so its total could not be recomputed against the new method. The spread between the first two rows is why species and storage matter more than any other choice on the page: litter from a broiler house carries several times the nutrient value of dairy solids per ton.

Availability factors: what this tool assumes, and where extension science differs

The tool’s Basic tab applies one availability factor per manure type to the entire gross value: dairy-solid 85%, dairy-liquid 90%, beef-solid 80%, beef-liquid 85%, swine-solid 85%, swine-liquid 95%, poultry-broiler 90%, poultry-layer 85%, horse 75%, sheep 80% and compost 70%. The Advanced tab instead splits nitrogen into its two pools, each factored its own way, shown here in full so you can see exactly what a result is built on.

Ammonium nitrogen retention, by application method (the fraction of ammonium N kept in the year of application):

Organic nitrogen mineralisation in year 1, by manure source (Missouri G9186 year-1 factors, with the Nebraska cross-check in brackets):

What changed, and why. The old Advanced tab applied a second method-based table to the organic pool, from 0.95 down to 0.15 by application method, behaving like a second retention table rather than a mineralisation rate. That is now retired. Extension worksheets split the pools: the ammonium fraction is retained at rates much like the first table above (0.95 injected or incorporated immediately, falling with delay and surface exposure), while the organic fraction only mineralises part-way in the first year. Nebraska’s current guidance credits 40% of organic N in year 1, 20% in year 2 and 10% in year 3 for most animal manures, which brackets the Missouri source factors the tool now uses; the older Nebraska table gave 15% for composted feedlot manure, which is the figure the compost option carries. Practically: if your lab report gives total N and ammonium N, enter organic N (total minus ammonium) in the first field and pick the source, and the tool now credits that organic pool at the Extension rate instead of the old method rate.

Two limits remain, stated plainly. First, the tool values only year-1 availability: it credits nothing for the residual nitrogen Nebraska documents releasing in years two to four, so a multi-year nutrient plan is worth more than the single-year figure here. Second, phosphorus and potassium are still credited at full price in the Advanced tab, while University of Nebraska training material estimates about 70% of phosphorus and 90% of potassium available in the first season; read the P and K lines as full replacement value, not first-season availability. And as before, the tool values every pound of nutrient whether or not the receiving crop needs it, while Missouri’s method caps value at crop need. None of this makes the tool useless; it makes it a screening estimate whose assumptions are now on the table, next to the nutrient plan it feeds into, such as the field-level figures in a corn cost per acre calculator.

What competing calculators miss

Manure valuation tools split into spreadsheets, worksheets and one-trick web calculators, and each leaves something out:

• Basic web calculators (Brave Calculator and similar): pounds times prices and nothing else. No availability discount, no application method, no sulfur, no transport, and the prices are whatever the page author picked, undisclosed as a dated assumption.
• Extension spreadsheets (Iowa State’s B1-65 Manure Calculator, Oklahoma State’s waste value sheet): rigorous, with application cost and even liming value for poultry litter, but they are downloads that demand fertilizer product prices, soil tests and crop needs before they answer anything. Nothing you can run standing at the pit.
• Extension worksheets (Missouri G9330, Nebraska G1519): the method gold standard, including crop-need caps and residual-year credits this tool lacks, but they end in a per-acre figure worked by hand, not a per-ton price you can quote a neighbour.
• The gap this page fills: all three levels in one browser tool, with the refreshed built-in prices and both nitrogen factor tables printed on the page, sulfur priced, transport netted out, a value assessment on every run, and copy and share built in, plus an explicit account of where its nitrogen method now follows the extension worksheets and where it still stops short.

That combination is what a mixed operation actually needs at decision time: a dairy or beef herd’s manure priced one way, a small ruminant enterprise checked with the goat farm profit calculator priced the same way, and one consistent set of assumptions across both.

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