Gallons on the ticket, pounds on the acre
A liquid fertilizer blend is still a nutrient blend. The guaranteed analysis is a percent by weight, the same language as a dry product. What changes is the measuring. You buy many liquids by the gallon, you meter them by the gallon, and the plant thinks in gallons per acre. A liquid fertilizer blend calculator has to carry both units without dropping the pounds of nutrient you meant to apply.
Start with your desired analysis: nitrogen, phosphate as P₂O₅, potash as K₂O, and sulfur. Add the acres and the liquid products you stock, each with its analysis, weight per gallon, and price. Gallons per acre times pounds per gallon is pounds of product per acre. That weight times the analysis is pounds of nutrient. Skip the weight per gallon and the gallons will not match the analysis you think you sold.
Price it where a dry bid can sit beside it
FertCalc Pro prices liquid products per ton, then shows the blend in gallons per acre and dollars per acre. Pricing per ton lets a liquid sit next to a dry product when you are deciding which form to quote. A grower comparing a liquid program with a dry program should see cost per acre and cost per pound of nutrient, not a per-gallon price on one bid and a per-ton price on the other. The calculator keeps that comparison in one place. You can build the liquid blend, and you can build the dry blend, from your desired analysis and the prices you set.
If a supplier quoted the liquid by the gallon, convert it before you compare. Price per ton equals the price per gallon divided by the pounds per gallon, times 2,000. If a liquid is $3.30 a gallon and weighs 11 pounds per gallon, the price per ton is $600. That ton price is what you enter, and it is what the cost per pound of nitrogen calculator uses when you want dollars per pound of N, P₂O₅, K₂O, or S for a single product. On that simpler calculator the full ton price is assigned to the nutrient you select. Treat a two-nutrient liquid as a screening number there, then come back here when the blend should credit the overlap.
More than one way to hit your desired analysis
As with dry fertilizer, more than one combination can meet your desired analysis. The lowest-cost gallons depend on this week's prices and on how much of each nutrient each product carries. Products that carry two nutrients are common. The calculator uses the products you priced and returns the gallons per acre, the nutrients those gallons deliver, and the price per acre.
You still read the answer. If a rate is wrong for the crop or the field, change your desired analysis or take a product off the list. The tool does not write the recommendation. The fertilizer blend calculator page is the same flow for liquid and dry together.
The quote and the blend sheet
The result the grower should leave with is a quote: products, gallons per acre, cost per acre, and the field total. The result the plant should leave with is a blend sheet from those same gallons. You set the desired number of batches. On a dry blend, batches are 15,000 lb or less. A liquid sheet splits the order the same way you set it, in gallons per batch, so the person at the inductor is not dividing a field total in their head. The sheet can also show what one gallon of the finished blend weighs and how much nitrogen, P₂O₅, K₂O, and sulfur that gallon carries. That per-gallon picture is how you check the mix against your desired analysis after the rates are set.
A stabilizer or application charge belongs on the quote as its own cost per acre. If you change a price, a density, or the acres after you print, print the quote and the sheet again. When the order is dry instead, use the dry fertilizer blend sheet: you set the desired number of batches, and each batch is 15,000 lb or less. Print the mode you calculated.
Check the density before you trust the gallons
Confirm the analysis, the weight per gallon, and the price with the supplier before you trust the gallons. FertCalc Pro does the rate math and the paperwork. It does not replace the label on the tank or a recommendation you trust. The app runs in the browser. A 14-day free trial needs no card. Add a card before it ends to keep going at $24.99 a month or $274.99 a year.