Fertilizer Blend & Cost Calculator
Compare user-entered fertilizer grades and dealer quotes by planned nutrient cost
Build a preliminary fertilizer blend from common products or your own product labels. Enter soil-test targets, product grades, prices, acres, and a placement scenario to screen product pounds per acre, tons, cost per planned nutrient, and excess nutrient flags. This is a planning and quote-comparison tool only; it is not a soil-test recommendation, nutrient-management plan, environmental compliance decision, product-label approval, blending compatibility check, or live price feed.
Calculate the per-acre cost of applying this blend, including fuel, labor, and equipment wear.
Field Operation Cost Calculator →Check local drawbar-power prompts before reviewing spreader draft, speed, tractor data, and field conditions.
PTO & Drawbar Power Budget Calculator →Size fuel storage so you can keep the applicator running through the entire spring window.
Bulk Fuel Storage Planner →Read the full guide on NPK math, cost per unit of nutrient, and custom blend vs. pre-mixed economics.
Fertilizer Blending Guide →How It Works
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Set Nutrient Targets
Enter target rates for N, P2O5, K2O, and S in pounds per acre from a soil test, crop plan, or qualified adviser.
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Configure Products
Use default editable products or add custom labels with N-P-K-S percentages and price per ton. Toggle products on or off to compare quote scenarios.
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Review the Calculator
Review product pounds per acre, tons, cost per acre, cost per planned nutrient, and excess nutrient flags. Treat the solver as a greedy planning heuristic, not a least-cost optimizer or approved blend.
Built For
- Farmers comparing current dealer quotes after a soil-test recommendation is already known
- Agronomists checking rough cost sensitivity before preparing a site-specific plan
- Farm managers budgeting input costs with clear source and price limitations
Assumptions
- Targets are entered as lb/acre of N, P2O5, K2O, and S from an outside recommendation.
- Product analyses are editable percent-by-weight values from current labels or quote sheets.
- Prices are user-entered dollars per short ton and exclude freight, application, tax, shrink, storage, finance, and availability constraints.
- P and K placement factors are local planning assumptions only, not universal availability values.
- The solver uses a greedy P2O5, K2O, N, S sequence and is not a least-cost linear optimizer.
Limitations
- Does not create a soil-test recommendation, nutrient-management plan, manure credit, water-quality compliance decision, or restricted-product label approval.
- Does not verify seed safety, salt index, product compatibility, storage, handling, density, liquid conversion, inhibitor need, micronutrients, or application-equipment suitability.
- Does not provide live prices, dealer availability, tax, freight, shrink, spreading cost, financing cost, yield response, profit guarantee, or least-cost optimization.
- Variable-rate prescriptions, zone management, pH, organic matter, residual N, mineralization, manure, irrigation, and weather are outside this calculator.
References
- Montana State University Extension fertilizer rate and cost arithmetic source pointer.
- University of Minnesota Extension guaranteed analysis and N-P-K label source pointer.
- USDA ERS fertilizer use and price data context source pointer.
- USDA AMS Market News price-reporting context source pointer.