Calculators
Fertilizer Application Rate Calculator
Convert a nutrient recommendation into product pounds per acre, total tons and cost, after manure or legume credits.
- Runs in your browser
- Nothing uploaded
The tool
Enter your numbers below. Results update as you type, and nothing leaves your browser.
Everything you enter stays on your own machine. Nothing is sent to us or to anyone else, which you can confirm in your browser network tab.
What people use it for
- Converting soil test recommendations
- Ordering fertiliser
- Comparing product prices
- Nutrient management plans
About this tool
What the Fertilizer Application Rate Calculator does
Recommendations are given in pounds of nutrient per acre (N, P₂O₅ or K₂O), but fertiliser products contain only part of that nutrient. Dividing the nutrient needed, after any credits, by the product’s nutrient percentage gives the pounds of product to apply.
Formula
- Nutrient needed = recommendation − credits
- Product rate = nutrient needed ÷ nutrient %
- Tons = rate × acres ÷ 2,000
Worked example
Using the starting values in the calculator above:
| Input | Value |
|---|---|
| Nutrient recommendation | 160 lb/acre |
| Credits (manure, previous legume) | 30 lb/acre |
| Product nutrient content | 46% |
| Acres | 120 |
| Product price per ton | $560 |
| Result | Value |
|---|---|
| Product rate | 282.6 |
| Total product needed (tons) | 16.96 |
| Nutrient to apply (lb/acre) | 130.0 |
| Cost per acre | $79.13 |
| Total cost | $9,496 |
| Cost per lb of nutrient | $0.61 |
How to read the result
Compare products on cost per pound of nutrient, not price per ton.
Split nitrogen applications can reduce losses on sandy or wet soils.
Estimates for planning. Use soil tests, local extension guidance and your agronomist’s recommendations for field decisions.
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Questions
Questions about this tool
The things clients actually want to know — costs, timelines, ownership and what happens after launch.
Divide the pounds of nutrient needed by the product's nutrient percentage (as a decimal).
The percentages of nitrogen (N), phosphate (P₂Oâ‚
About 217 lb, because urea is 46% nitrogen.
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