Fertilizer (NPK) Calculator & Urea, DAP & MOP
Calculates urea per acre
Pick your crop and field size and get exactly how many kg and bags of Urea, DAP and MOP to apply — from the recommended N-P₂O₅-K₂O dose, soil-adjusted, with split-application advice.
Recommended dose N-P₂O₅-K₂O = 120-60-40 kg/ha
For 1 acre of wheat: apply 52.8 kg DAP and 27 kg MOP as a basal dose at sowing, and split the 84.9 kg urea into 2–3 top-dressings (e.g. ½ basal, ½ at active growth) so nitrogen isn't lost.
Next: get a soil test to fine-tune P and K (set the Low/High toggles), apply organic matter/FYM too, and never exceed the recommended N — it lodges the crop and wastes money.
Doses ≈ ICAR / state RDF; confirm with a local soil test & advisory.
Fertilizer — key facts
- Urea
- 46% N (nitrogen)
- DAP
- 18% N + 46% P₂O₅
- MOP
- 60% K₂O (potassium)
- Wheat dose
- 120-60-40 (N-P₂O₅-K₂O) kg/ha
- DAP kg
- = P₂O₅ needed ÷ 0.46
- Urea kg
- = (N − N from DAP) ÷ 0.46
- Apply
- DAP+MOP basal; split urea 2–3×
- Privacy
- Runs in your browser; nothing uploaded
How the fertilizer plan is worked out
Each crop has a recommended dose of fertiliser (RDF) in kilograms of nitrogen, phosphorus (P₂O₅) and potassium (K₂O) per hectare. The calculator scales that to your field, then converts it to the three straight fertilisers farmers actually buy. Phosphorus comes first from DAP (each kg gives 0.46 kg P₂O₅ and 0.18 kg N); the nitrogen DAP contributes is subtracted, and the remaining nitrogen is met with Urea (0.46 kg N per kg). Potassium is supplied by MOP (0.60 kg K₂O per kg).
A soil test refines it: high soil P or K means you apply less, low means more. And because nitrogen is easily lost, urea is split across the season rather than dumped at sowing — basal DAP and MOP build the root zone, while staged urea feeds growth when the crop needs it.
How much urea per acre
Get the exact urea quantity (and bags) for your crop and area — after subtracting the nitrogen DAP already supplies.
DAP for wheat & paddy
Phosphorus is met first with DAP; the tool shows the kg and 50-kg bags for wheat, rice and 16 other crops.
Soil-test-adjusted dose
Set soil phosphorus and potassium as Low/Medium/High and the dose scales so you don't waste fertiliser.
Fertilizer cost per acre
Add your prices to see the total Urea + DAP + MOP cost for the field, in your currency.
Frequently Asked Questions
How do I calculate fertilizer per acre?+
Start from the crop's recommended dose of N-P₂O₅-K₂O (kg/ha), scale it to your area, then convert to straight fertilisers: supply phosphorus with DAP (46% P₂O₅, 18% N), top up the remaining nitrogen with Urea (46% N), and supply potassium with MOP (60% K₂O). This calculator does all of it for your crop, area and soil.
How much urea and DAP does wheat need per acre?+
Wheat's recommended dose is about 120-60-40 (N-P₂O₅-K₂O) per hectare. For one acre that's roughly 85 kg urea, 53 kg DAP and 27 kg MOP with average soil — the calculator gives the exact figures and the number of 50-kg bags for your field.
What is the difference between Urea, DAP and MOP?+
Urea supplies nitrogen (46% N). DAP (di-ammonium phosphate) supplies phosphorus plus some nitrogen (18% N, 46% P₂O₅). MOP (muriate of potash) supplies potassium (60% K₂O). Together they cover a crop's full N-P-K need.
What does NPK mean and what do the numbers stand for?+
N-P-K is nitrogen, phosphorus (as P₂O₅) and potassium (as K₂O) — the three nutrients crops need most. A dose like 120-60-40 means 120 kg N, 60 kg P₂O₅ and 40 kg K₂O per hectare. N drives leafy growth, P roots and flowering, K overall vigour and disease resistance.
Should I split the urea or apply it all at once?+
Split it. Apply DAP and MOP fully at sowing (basal), but split urea into 2–3 doses — typically half at sowing and the rest at active growth/tillering — because nitrogen leaches and volatilises if applied all at once, wasting money and polluting water.
How does a soil test change the fertilizer dose?+
If your soil already tests high in phosphorus or potassium, you need less of them; if low, you need more. Set the soil P and K status (Low/Medium/High) and the calculator scales those nutrients up or down, so you don't over- or under-apply.
Do legumes need nitrogen fertilizer?+
Very little — legumes like soybean, chickpea and groundnut fix their own nitrogen, so they get only a small starter dose (often covered by the N in DAP) plus phosphorus and potassium. The calculator reflects this with near-zero urea for legumes.
Can I calculate the fertilizer cost?+
Yes — switch on prices, enter your local cost per kg for Urea, DAP and MOP and pick a currency, and the tool totals the fertiliser cost for your field.
Can I use bigha, acre or hectare?+
Yes — acre, hectare, bigha, guntha or square metres. Bigha varies regionally; this uses a common North-India pucca bigha (~2,529 m²), so adjust if your local bigha differs.
Is more fertilizer always better?+
No. Beyond the recommended dose, extra nitrogen causes lush, weak growth that lodges (falls over) and invites disease, while excess phosphorus and potassium are simply wasted money and can harm soil and water. Apply the right dose, split correctly, with organic matter.