Manure Production Calculator & Dung, FYM & N-P-K
Turns dung into FYM
See what your herd produces — from animals, numbers and period get the fresh dung, the finished FYM, and the N-P-K it supplies, plus the urea, DAP and MOP it replaces.
Enter your herd
Next: compost the dung well (turn the heap, keep it moist, cover it) before applying so nutrients aren't lost — or feed it to a biogas digester and use the slurry as a richer manure.
FYM ≈ 50% of fresh dung after composting; N-P₂O₅-K₂O ≈ 0.5-0.2-0.5%.
Manure & FYM — key facts
- Cow dung
- ≈ 10–15 kg/day
- Buffalo dung
- ≈ 20 kg/day
- FYM recovery
- ≈ 50% of fresh dung
- FYM N-P₂O₅-K₂O
- ≈ 0.5 · 0.2 · 0.5%
- Collection
- 70–90% housed; less grazing
- FYM application
- ≈ 5–10 t/ha
- Also great for
- compost & biogas
- Privacy
- Runs in your browser; nothing uploaded
Your herd is a fertilizer factory
Every animal on the farm produces a steady stream of dung that, composted into farmyard manure, is one of the most valuable inputs you have — building soil organic matter, structure and biology while supplying real nutrients. Yet most farmers never quantify it, so it's under-used or wasted. Knowing the tonnage and the N-P-K turns manure from a chore into a planned, money-saving resource.
This tool estimates the fresh dung, the finished FYM after composting, and the nitrogen, phosphorus and potassium your herd supplies over any period — plus the urea, DAP and MOP that nutrient load replaces. Use it to plan composting, credit manure against your fertilizer bill, size a biogas plant, or work out how much land your manure can cover. Pair it with the Compost & Manure, Biogas and Crop Nutrient Removal tools.
Quantify the manure
Know the dung and FYM tonnage your herd really produces.
Credit the nutrients
Subtract the N-P-K from your fertilizer bill as urea/DAP/MOP.
Plan composting
Size your compost pits and field applications from the tonnage.
Feed a biogas plant
Use the dung figure to size a biogas digester and slurry output.
Frequently Asked Questions
How much manure does a cow produce?+
A cow produces roughly 10–15 kg of fresh dung a day (a buffalo more, around 20 kg). Over a year, allowing for what you can actually collect (often 60–70%), that's several tonnes. This tool totals the fresh dung and the finished FYM for your animals, numbers and period.
What is FYM?+
Farmyard manure (FYM) is well-rotted dung and bedding composted together. During composting, roughly half the fresh weight is lost as moisture and gas, so finished FYM is about 50% of the fresh dung weight — but it's stable, easy to handle and rich in humus and nutrients.
What is the N-P-K of farmyard manure?+
Typical FYM contains about 0.5% nitrogen, 0.2% P₂O₅ and 0.5% K₂O, plus organic matter and micronutrients (well-made FYM can be higher). This tool applies these to your FYM tonnage to estimate the total N, P and K it supplies to your fields.
How much fertilizer does manure replace?+
Convert the manure's nutrients into fertilizer equivalents: its nitrogen ÷ 0.46 = urea, its P₂O₅ ÷ 0.46 = DAP, its K₂O ÷ 0.60 = MOP. The tool shows these so you can credit the manure against your fertilizer bill — though manure also adds organic matter that fertilizer can't.
Why does collection efficiency matter?+
Not all dung is recoverable — animals on pasture drop much of it where you can't collect it, and some is lost in handling. A housed or semi-housed herd collects more (70–90%); free-grazing animals far less. Enter a realistic collection percentage so the manure estimate isn't overstated.
Is manure better than chemical fertilizer?+
They're complementary. Manure releases nutrients slowly, builds organic matter, improves soil structure and water-holding, and feeds soil life — things fertilizer can't do. Fertilizer delivers nutrients fast and precisely. Best practice uses manure as the base and fertilizer to top up to the crop's full need.
How do I compost manure into good FYM?+
Stack dung and bedding in a pit or heap, keep it moist (not waterlogged), turn it occasionally for aeration, and let it rot for 3–6 months until dark, crumbly and earthy-smelling. Covering the heap reduces nutrient loss. The Compost & Manure and Vermicompost tools help plan it.
Can I use the dung for biogas instead?+
Yes — fresh dung is an excellent biogas feedstock, and the digested slurry that comes out is still a good manure (often richer in available nitrogen than raw dung). Many farms run dung through a biogas plant first, then compost or apply the slurry. The Biogas tool sizes that option.
How much land will my manure cover?+
Divide the FYM tonnage by your application rate (commonly 5–10 t/ha for FYM). For example, 10 tonnes of FYM at 5 t/ha covers about 2 hectares. Use the Compost & Manure tool with this tool's FYM output to plan field applications.
Does the animal type change the nutrients?+
The dung quantity varies a lot by species (cattle and buffalo most, poultry least per bird), and poultry manure is notably richer in nutrients than cattle dung. This tool sets the dung rate per animal type; the FYM nutrient percentages used are typical mixed-FYM values, so treat poultry results as conservative.