Urea Calculator (urea needed for nitrogen)
Work out how much urea and how many bags you need to give your crop the nitrogen (N) it needs per acre.
Quick answer
50 kg N per acre, 2 acres: 217.4 kg, i.e. 5 bags.
How it is calculated
- Urea contains 46% nitrogen.
- Urea per acre = nitrogen ÷ 0.46 = 50 ÷ 0.46 = 108.7 kg.
- Total = per acre × acres; bags = total ÷ 45 kg, rounded up.
Worked example
A 2-acre field needs 50 kg nitrogen per acre. You need 217.4 kg of urea in total, i.e. 5 bags of 45 kg.
| Nitrogen needed per acre | 50 kg |
| Area | 2 acre |
| Urea | 217.4 kg |
| Bags (45 kg) | 5 |
Formula
Urea = Nk×Ac/0.46 Bags (45 kg) = ceil(Nk×Ac/0.46/45)
Good to know
- Decide the dose from a soil test (Soil Health Card) and agriculture department advice.
- Splitting urea into 2–3 doses usually works better than one.
Questions people ask
How much nitrogen is in urea?
46%.
How heavy is a urea bag?
Bags now come in 45 kg.
Should I count nitrogen from DAP?
Yes, DAP has 18% N; subtract it and give the rest as urea.
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Updated 13 Nov 2026 · Desktop N Calculator v1.2.0