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Reference · Calculations
A tote is rated by weight and sold by volume. That gap causes most of the problems.
Nobody overfills a container deliberately. They fill it to the line, because the line is what a container looks like it is for. But an IBC is approved to a gross weight, and for anything denser than water that limit arrives long before the fluid reaches the top. This page is the arithmetic that prevents it.
Short answer
Gross weight = (gallons × density) + tare. Max fill = (gross rating − tare) ÷ density. A 275 gal tote holds 275 gal of water but only ~220 gal of 28% UAN.
- 275 tare
- 145 lb
- 330 tare
- 165 lb
- 275 cube
- 51 cu ft
- Water
- 8.34 lb/gal
Form 01 · Spec request
Not sure your fluid fits?
Tell us the product and the volume you need to move. We will confirm which format and rating suits it before you buy the wrong one.
Method
Three calculations that cover almost everything.
- 01
Gross weight
Gallons multiplied by density in pounds per gallon, plus the container tare. Compare the answer to the plate rating before filling, not after.
(gal × density) + tare - 02
Maximum fill
Gross rating minus tare, divided by density. This is the number of gallons you may actually put in, and for dense product it is well under the nominal capacity.
(rating − tare) ÷ density - 03
Truck payload
Units per trailer multiplied by gross weight per unit, checked against the trailer's legal payload. Dense product hits a weight limit long before the trailer is full.
units × gross - 04
Cube
External length by width by height, divided by 1,728 to get cubic feet. Carriers price the space, so cube drives freight class regardless of what is inside.
(L × W × H) ÷ 1728
Reference tables
The numbers you will actually look up.
| Format | Tare | Gross rating | External cube | Max payload |
|---|---|---|---|---|
| 275 gal composite | 145 lb | 2,500 lb | 51 cu ft | 2,355 lb |
| 330 gal composite | 165 lb | 3,000 lb | 59 cu ft | 2,835 lb |
| 550 gal oversize | 285 lb | 5,100 lb | 83 cu ft | 4,815 lb |
| 265 gal stainless | 330 lb | 3,300 lb | 63 cu ft | 2,970 lb |
| Empty cage & pallet only | 88 lb | — | 51 cu ft | — |
| Fluid | lb per gallon | Max gallons at 2,500 lb gross | Usable capacity |
|---|---|---|---|
| Gasoline | 6.1 | 275 (full) | 100% |
| Diesel fuel | 7.1 | 275 (full) | 100% |
| Motor oil | 7.4 | 275 (full) | 100% |
| Isopropyl alcohol | 6.6 | 275 (full) | 100% |
| Water | 8.34 | 275 (full) | 100% |
| Liquid detergent | 8.8 | 267 | 97% |
| Brine, 23% NaCl | 9.9 | 238 | 87% |
| Liquid fertiliser, 28% UAN | 10.7 | 220 | 80% |
| Corn syrup | 11.7 | 201 | 73% |
| Sulfuric acid, 93% | 15.3 | 154 | 56% |
| Fluid | Gross per unit | Units before 44,000 lb payload | Units that fit by space |
|---|---|---|---|
| Empty totes | 145 lb | 300+ | 45–80 |
| Diesel fuel | 2,098 lb | 20 | 45–52 |
| Water | 2,435 lb | 18 | 45–52 |
| Brine | 2,868 lb | 15 | 45–52 |
| Corn syrup (fill to weight) | 2,497 lb | 17 | 45–52 |
Worked example
A blender filling 28% UAN.
The product is 10.7 pounds per gallon. The container is a 275 gallon composite rated to 2,500 pounds gross with a 145 pound tare.
Maximum payload is 2,500 minus 145, which is 2,355 pounds. Divided by 10.7 pounds per gallon that gives 220 gallons. So the usable capacity of a 275 gallon tote for this product is 220 gallons — eighty percent of nominal.
Filling to the line instead would put 275 gallons in, weighing 2,943 pounds plus tare: 3,088 pounds against a 2,500 pound rating. That is 23% over, and it is the exact failure mode that splits a pallet base during a forklift lift.
The correct answer is to mark the 220 gallon level, fill to it, and order more containers — or move the product in a rated oversize container instead.
Questions
Weights and dimensions, answered.
01How do I calculate the weight of a filled tote?
Multiply gallons by the fluid density in pounds per gallon, then add the container tare. For a 275 gallon tote of water: 275 x 8.34 = 2,290 pounds, plus 145 pounds of tare, equals 2,435 pounds gross.
02What is tare weight?
The weight of the empty container — bottle, cage, pallet and fittings together. Roughly 145 pounds for a composite 275, 165 for a 330, 285 for a 550 and about 330 for a 265 gallon stainless vessel.
03What happens if I exceed the gross rating?
The rating exists because the cage, the base and the closures were tested to it. Exceeding it risks base failure during handling, closure failure under transport shock, and — for regulated cargo — puts you outside the terms of the container's approval.
04How do I fill to weight rather than to volume?
Work out the maximum gallons your fluid allows: subtract the tare from the gross rating and divide by the density. For 28% UAN at 10.7 lb/gal in a 275: (2,500 − 145) / 10.7 = about 220 gallons. Mark that level and fill to it.
05What cube should I use for freight class?
About 51 cubic feet for a 275 gallon tote and 59 for a 330, based on external dimensions. Carriers price on the space consumed, not the fluid inside.
Worked examples
Four calculations, done end to end.
The formulas are trivial. What causes problems is not doing them, so here they are applied to real situations.
| Step | Working | Result |
|---|---|---|
| Container rating | 275 gal composite, plate says 2,500 lb gross | 2,500 lb |
| Tare | Composite base, weighed | 145 lb |
| Available payload | 2,500 − 145 | 2,355 lb |
| Fluid density | 28% UAN | 10.7 lb/gal |
| Maximum fill | 2,355 ÷ 10.7 | 220 gal |
| Filling to the line instead | 275 × 10.7 + 145 | 3,088 lb — 23% over |
| Action | Mark 220 gal on the cage, fill to the mark | — |
| Step | Working | Result |
|---|---|---|
| Product | Water, 275 gal containers | 8.34 lb/gal |
| Gross per unit | 275 × 8.34 + 145 | 2,435 lb |
| Trailer payload allowance | Typical dry van | 44,000 lb |
| Units by weight | 44,000 ÷ 2,435 | 18 |
| Units by space | 53-ft van, floor loaded | 45–52 |
| Limiting factor | Weight | 18 units |
| If empty instead | 44,000 ÷ 145 | 300+ by weight, 80 by space |
| Step | Working | Result |
|---|---|---|
| External dimensions | 48 × 40 × 46 in | 88,320 cu in |
| Cubic feet | 88,320 ÷ 1,728 | 51.1 cu ft |
| Empty weight | Tare | 145 lb |
| Density | 145 ÷ 51.1 | 2.8 lb/cu ft |
| Consequence | Very low density | High freight class; consolidate or collect |
| Full of water | 2,435 ÷ 51.1 | 47.7 lb/cu ft — weight limited |
| Step | Working | Result |
|---|---|---|
| Stand height to water surface | 4 ft when full | 4 ft |
| Pressure per foot of head | Standard | 0.433 psi/ft |
| Pressure at the outlet | 4 × 0.433 | 1.73 psi |
| What that runs | Drip irrigation, soaker hose | Adequate |
| What it does not | Sprinkler at 20 psi | Would need ~46 ft of head |
| Correct solution | Pump downstream of the tank | — |
Quick reference
The numbers worth memorising.
8.34lb/gal
Water
The reference density
1,728
Cubic inches per cubic foot
For cube calculations
0.433psi/ft
Head pressure
Gravity feed from a stand
3.785L/gal
Gallons to litres
US gallons
| Format | Tare | Gross rating | Max payload | External cube | Empty density |
|---|---|---|---|---|---|
| 220 gal composite | 125 lb | 2,200 lb | 2,075 lb | 43 cu ft | 2.9 lb/cu ft |
| 275 gal composite | 145 lb | 2,500 lb | 2,355 lb | 51 cu ft | 2.8 lb/cu ft |
| 330 gal composite | 165 lb | 3,000 lb | 2,835 lb | 59 cu ft | 2.8 lb/cu ft |
| 550 gal oversize | 285 lb | 5,100 lb | 4,815 lb | 83 cu ft | 3.4 lb/cu ft |
| 265 gal stainless | 330 lb | 3,300 lb | 2,970 lb | 63 cu ft | 5.2 lb/cu ft |
| Cage and pallet only | 88 lb | — | — | 51 cu ft | 1.7 lb/cu ft |
Extended FAQ · 7 questions
More questions, answered
01How do I calculate the weight of a filled container?
Multiply gallons by the fluid density in pounds per gallon, then add the container tare. A 275 gallon container of water: 275 × 8.34 = 2,290 pounds, plus 145 pounds of tare, equals 2,435 pounds gross.
02What exactly is tare weight?
The weight of the empty container — bottle, cage, pallet and fittings together. Roughly 145 pounds for a composite 275, 165 for a 330, 285 for a 550 and about 330 for a 265 gallon stainless vessel.
03What happens if I exceed the gross rating?
The rating exists because the cage, base and closures were tested to it. Exceeding it risks base failure during handling, closure failure under transport shock, and for regulated cargo it puts you outside the terms of the container's approval.
04How do I fill to weight rather than to volume?
Subtract the tare from the gross rating and divide by the fluid density. For 28% UAN at 10.7 pounds per gallon in a 275: (2,500 − 145) ÷ 10.7 = about 220 gallons. Mark that level on the cage and fill to the mark.
05What cube should I use for freight class?
About 51 cubic feet for a 275 gallon container and 59 for a 330, based on external dimensions. Carriers price the space consumed rather than the fluid inside.
06Are the moulded volume markings accurate?
They are indicative rather than metrological. Wall flexure, temperature and the moulding process all introduce error. If you need an accurate fill, weigh it — which also gives you the number the plate cares about.
07Why do full containers ship in such small counts?
Because weight rather than space fills a trailer. A 53-foot van has room for around fifty 275s, but with water in them you reach a 44,000 pound payload at about eighteen units.
Next step
Send us the density and the volume.
We will tell you the format, the count and the fill level before you order — which is considerably cheaper than finding out on the dock.