---
title: "Liquid Fertilizer Weight Per Gallon: Density, Salting-Out Temperature, and Application Rate Calculator"
canonical: "https://theyieldgrid.com/liquid-fertilizer-weight-per-gallon/"
model_id: "tyg-678"
model_version: "1.0.0"
last_reviewed: "2026-08-25T01:35:18"
reviewed_by: "Umer Hayiat"
---

# Liquid Fertilizer Weight Per Gallon: Density, Salting-Out Temperature, and Application Rate Calculator

> Canonical calculator: [https://theyieldgrid.com/liquid-fertilizer-weight-per-gallon/](https://theyieldgrid.com/liquid-fertilizer-weight-per-gallon/)

## What this calculator does

Home - Free Gardening Calculators & Tools - Liquid Fertilizer Weight Per Gallon: Density, Salting-Out Temperature, and Application Rate Calculator Liquid fertilizer weight per gallon is not a fixed number. Every product has a different density, and that density shifts with temperature. UAN 32% at 60°F weighs 11.06 lbs/gal. At 80°F it weighs 10.98. Below 32°F it stops being a liquid at all and becomes a solid crystal slurry that can seize pump impellers. Using the wrong density figure in your application math produces the wrong N rate, not by a rounding error, but by a meaningful percentage of the total nitrogen you intended to apply.

## Inputs

| Input | ID | Type | Unit | Range or choices | Required |
|---|---|---|---|---|---|
| Liquid Fertilizer Type * | `lfdst_ftype` | select |  | — Select Fertilizer — = ``; UAN 32% (32-0-0) = `uan32`; UAN 28% (28-0-0) = `uan28`; UAN 10-34-0 (Starter) = `uan10`; AMS Solution (8-0-0-9S) = `ams`; Urea Solution (46-0-0) = `urea_solution` | Yes |
| Current Ambient Temperature (°F) * | `lfdst_temp` | number | °F | -40 to 120 | Yes |
| Target Application Rate (Lbs of N per Acre) * | `lfdst_nrate` | number | Lbs of N per Acre | 1 to 400 | Yes |

## Outputs

| Output ID | Default state |
|---|---|
| `lfdst_ftype_err` | Required — please select a fertilizer type |
| `lfdst_temp_err` |  |
| `lfdst_nrate_err` |  |
| `lfdst_results` | Density — lbs per gallon at your temperature Gallons Needed/Acre — to hit your N target Temperature Safety Zone -40°F 0°F 32°F 60°F 100°F+ — Lbs N per Gallon — Tons per Acre Applied — Gal per 100 Acres Warnings & Standards Recommended Equipment for Freeze-Risk Storage 🔴 Heavy-Duty Poly Transfer Pump (Banjo) 🧰 IBC Tote Wrap Heaters 🔧 2-Inch Suction Hoses (Freeze-Rated) 📊 Digital Flow Meter Density at Key Temperatures — Selected Fertilizer Temp (°F) Density (lbs/gal) Lbs N/gal Status How This Calc |
| `lfdst_out_primary` | — |
| `lfdst_out_gal` | — |
| `lfdst_interp` |  |
| `lfdst_out_npg` | — |
| `lfdst_out_tons` | — |
| `lfdst_out_100` | — |
| `lfdst_warn_box` | Warnings & Standards |

## Formula and method

Our algorithm accounts for molecular expansion to ensure your nitrogen rate remains precise as ambient temperatures shift. Show the calculation steps Step 1: Density lookup by fertilizer type and temperature Each fertilizer type has a density profile across temperatures, based on published reference values from the Fertilizer Institute. The tool interpolates linearly between the two nearest reference temperature points to arrive at density at the exact entered temperature. If the entered temperature is at or below the salting-out threshold, the density is returned as null and calculation stops. Step 2: Lbs N per gallon Lbs_N_per_gal = Density (lbs/gal) x (N% / 100) Example: UAN 32% at 60°F: 11.06 x 0.32 = 3.539 lbs N/gal Step 3: Gallons needed per acre Gallons_per_acre = Target_Lbs_N / Lbs_N_per_gal Example: 100 lbs N target / 3.539 = 28.26 gal/acre Step 4: Salting-out freeze check IF Temperature

## Verified worked examples

### Example 1: Standard UAN 32% Pre-Plant at 60°F

Fertilizer: UAN 32% Temperature: 60°F Target N rate: 100 lbs N/acre Density at 60°F = 11.06 lbs/gal Lbs N/gal = 11.06 x 0.32 = 3.539 lbs N/gal Gallons needed = 100 / 3.539 = 28.26 gal/acre Result: 28.26 gallons of UAN 32% per acre delivers 100 lbs of elemental nitrogen at standard storage temperature. This is the baseline scenario most agronomists use when planning pre-season volumes. Temperature is neutral; no freeze risk applies.

### Example 2: UAN 28% Applied During a Cold Snap at 40°F

Fertilizer: UAN 28% Temperature: 40°F Target N rate: 80 lbs N/acre Density at 40°F = 10.66 lbs/gal Lbs N/gal = 10.66 x 0.28 = 2.985 lbs N/gal Gallons needed = 80 / 2.985 = 26.80 gal/acre Result: 26.80 gallons of UAN 28% per acre delivers 80 lbs N at 40°F. Salting-out threshold for UAN 28% is 0°F; no freeze risk at this temperature. UAN 28% provides a useful cold-weather operating margin compared to UAN 32%, accepting temperatures down to 0°F before crystallization risk enters the picture.

### Example 3: UAN 32% Stored in an Unheated Building at 28°F

Fertilizer: UAN 32% Temperature: 28°F Target N rate: 120 lbs N/acre Density at 28°F: CRYSTALLIZED. UAN 32% salts out at 32°F. At 28°F the solution has already converted partially or fully into solid urea and ammonium nitrate crystals. Result: Application math cannot be completed. The product is outside its fluid operating range and must be warmed above 32°F before any transfer or application. Running a transfer pump against crystallized product is the single most expensive field mistake in liquid nitrogen management. A $500 poly impeller pump can be destroyed in seconds by solid crystal material drawn into the intake.

## Assumptions

Fertilizer: UAN 32% Temperature: 60°F Target N rate: 100 lbs N/acre Density at 60°F = 11.06 lbs/gal Lbs N/gal = 11.06 x 0.32 = 3.539 lbs N/gal Gallons needed = 100 / 3.539 = 28.26 gal/acre Result: 28.26 gallons of UAN 32% per acre delivers 100 lbs of elemental nitrogen at standard storage temperature. This is the baseline scenario most agronomists use when planning pre-season volumes. Temperature is neutral; no freeze risk applies. Our algorithm accounts for molecular expansion to ensure your nitrogen rate remains precise as ambient temperatures shift. Show the calculation steps Step 1: Density lookup by fertilizer type and temperature Each fertilizer type has a density profile across temperatures, based on published reference values from the Fertilizer Institute. The tool interpolates linearly between the two nearest reference temperature points to arrive at density at the exact entered temperature. If the entered temperature is at or below the salting-out threshold, the density is returned as null and calculation stops. Step 2: Lbs N per gallon Lbs_N_per_gal = Density (lbs/gal) x (N% / 100) Example: UAN 32% at 60°F: 11.06 x 0.32 = 3.539 lbs N/gal Step 3: Gallons needed per acre Gallons_per_acre = Target_Lbs_N / Lbs_N_per_gal Example: 100 lbs N target / 3.539 = 28.26 gal/acre Step 4: Salting-out freeze check IF Temperature

## Limitations and safety

Density reference values are based on standard commercial-grade fertilizer solutions. Actual product density can vary up to plus or minus 0.5% depending on manufacturer and batch concentration. The temperature range modeled is -40°F to 120°F. Values at the extremes of this range involve greater interpolation distance between reference points and carry slightly more uncertainty. 10-34-0 is a suspension fertilizer, not a true solution. The density values are approximate, agitation is required before and during application, and no single salting-out temperature applies. Viscosity changes below 32°F can impair flow even if the material does not crystallize completely. Salting-out thresholds are industry-standard reference values. Actual crystallization onset can vary by a few degrees depending on product purity and storage history. Verify with your supplier if applying near the boundary. This tool calculates application volume math only. Boom output rate, flow meter calibration, nozzle pressure, and travel speed are outside its scope. N rate inputs are treated as elemental nitrogen targets. The tool does not account for denitrification, volatilization losses, or soil immobilization. Worked Example 3 above uses a temperature of 28°F as an assumption to illustrate the salting-out failure mode; the tool does not produce a gallons-per-acre figure in that scenario because no fluid density exists at that temperature for UAN 32%. AMS solution and urea solution density profiles are based on representative commercial formulations. High-analysis variants may differ slightly from the values used here. Critical Warnings UAN 32% crystallizes at exactly 32°F. The urea and ammonium nitrate in solution precipitate back into solid form at the freezing point of water. This is not a viscosity change; it is a phase transition. A transfer pump run against crystallized UAN 32% can have its impellers destroyed within seconds. The damage is not repairable by thawing the pump. Near-threshold conditions (within 10°F of salt-out temperature) are an active risk zone. A tank that reads 42°F at 9 a.m. after a cold night may have product that partially crystallized and re-melted near the bottom. Nighttime low forecasts should be checked against the salt-out temperature of your product before planning morning pump-outs. Urea solution (46-0-0) has a higher salt-out temperature (34°F) than the freezing point of water. This surprises many operators who expect liquid fertilizer to behave like water. Urea solution can crystallize in conditions where a water-based assumption would call it safe. AMS solution salts out at 18°F , which gives more cold-weather operating margin than the urea-based products, but late fall and early spring overnight lows in northern production regions can still breach that threshold. Minimum Standards Always confirm storage temperature with a physical thermometer at the tank before beginning a pump transfer in ambient temperatures below 50°F. For UAN 32% stored outdoors in fall and winter, the industry-standard mitigation is either product replacement with UAN 28% or installation of an IBC tote wrap heater maintaining tank temperature above 40°F. Transfer pumps used for UAN should be rated for crystalline-risk service. Poly centrifugal pumps (Banjo-style) are the standard recommendation; cast iron impellers are inappropriate for UAN service where freeze risk exists. Competitor Trap: Most published “liquid fertilizer weight per gallon” reference pages list a single density number per product with no temperature context. A farmer who looks up “UAN 32% weight per gallon,” finds 11.06 lbs, uses that for winter planning, and then fills nurse tanks from an outdoor IBC at 30°F may find the tank line will not prime at all, not because of a pump failure, but because the product has already solidified. The density figure is useless without the temperature it applies to. This calculator pairs both inputs together by design. The fertilizer salt index calculator is useful for evaluating placement risk when applying high-analysis liquid fertilizers near seed; the salt index concept is distinct from the salting-out threshold discussed here, but both matter in a complete fertility placement decision. For precise active ingredient load math across field applications, the active ingredient per acre calculator handles multi-product blending scenarios.

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## Provenance

- Model ID: `tyg-678`
- Model version: `1.0.0`
- Reviewed by: Umer Hayiat
- Page modified: 2026-08-25T01:35:18
- Runtime SHA-256: `6009be409579dbddc3a49e40471adca34e6b78a160043945a6f18dd8436206ac`

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