Sizes · engineering
The weight maths that stops a tote failing on your floor
Every tote question that ends badly starts with weight. This page gives you the arithmetic, a table of common liquids, and the fill limits that matter when your product is heavier than water.
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The four calculations you will actually use
1. Gross weight
gross lb = gallons × 8.345 × SG + tare lb. For 275 gallons of a 1.2 SG liquid in a tote with a 128 lb tare: 275 × 8.345 × 1.2 + 128 = 2,882 lb.
2. Maximum fill for a heavy liquid
max gallons = (rated gross − tare) ÷ (8.345 × SG). For a tote whose marking allows 4,000 lb gross, with a 128 lb tare, carrying sulphuric acid at SG 1.83: (4,000 − 128) ÷ (8.345 × 1.83) = 253 gallons, not 275. Use the figure on your own unit’s marking.
3. Floor loading
lb per sq ft = gross ÷ footprint sq ft. A 330 gallon tote of water: 2,905 ÷ 13.3 = 218 lb/sq ft. Compare that against your slab, mezzanine or trailer floor rating before delivery, not after.
4. Rack bay loading
bay load = units per level × gross. Two 275 gallon totes of water on one level is about 4,840 lb. Racking is engineered per installation — get the actual rated capacity plate, not a rule of thumb.
The headspace rule: never fill to the brim. HDPE expands, liquids expand more, and a sealed tote that goes from a cool warehouse into a hot trailer will build pressure. That is how bottles bulge and lids weep. Follow the filling limits in the SDS and current regulations.
Specific gravity and liquid weight for common products
| Liquid | Typical SG | Liquid weight (lb) |
|---|---|---|
| Acetone | 0.79 | 1,813 |
| Ethanol 200 proof | 0.79 | 1,813 |
| Isopropyl alcohol | 0.79 | 1,813 |
| Diesel fuel | 0.85 | 1,951 |
| Kerosene | 0.82 | 1,882 |
| Motor oil SAE 30 | 0.89 | 2,042 |
| Hydraulic oil | 0.87 | 1,997 |
| Vegetable oil | 0.92 | 2,111 |
| Soybean oil | 0.92 | 2,111 |
| Linseed oil | 0.93 | 2,134 |
| Water | 1.00 | 2,295 |
| Propylene glycol | 1.04 | 2,387 |
| Ethylene glycol | 1.11 | 2,547 |
| Sodium hydroxide 25% | 1.27 | 2,914 |
| Sodium hydroxide 50% | 1.53 | 3,511 |
| Sodium hypochlorite 12.5% | 1.20 | 2,754 |
| Hydrochloric acid 31% | 1.16 | 2,662 |
| Sulphuric acid 93% | 1.83 | 4,200 |
| Phosphoric acid 75% | 1.58 | 3,626 |
| Nitric acid 67% | 1.40 | 3,213 |
| Ferric chloride 40% | 1.42 | 3,259 |
| Aluminium sulphate | 1.33 | 3,052 |
| Liquid sugar 67 Brix | 1.33 | 3,052 |
| Molasses | 1.42 | 3,259 |
| Honey | 1.42 | 3,259 |
| Maple syrup | 1.33 | 3,052 |
| Vinegar 5% | 1.01 | 2,318 |
| Brine, saturated | 1.20 | 2,754 |
| Wine | 0.99 | 2,272 |
| Beer | 1.01 | 2,318 |
| Milk | 1.03 | 2,364 |
| UAN 32 fertiliser | 1.32 | 3,029 |
| Urea solution 50% | 1.14 | 2,616 |
| Calcium chloride 38% | 1.38 | 3,167 |
| Glycerin 99% | 1.26 | 2,892 |
Liquid weight = 275 × 8.345 × SG. Specific gravities are typical values around room temperature and vary with temperature and concentration; your product’s safety data sheet is the authority. A listed liquid is not a statement that it can be stored or shipped in a given tote — check compatibility, the unit’s marking and current regulations.
Typical tare weights
| Size | Typical empty weight | Note |
|---|---|---|
| 120 gal | 70–90 lb | Varies by maker |
| 275 gal | 120–150 lb | Plastic base lightest, steel heaviest |
| 330 gal | 140–175 lb | Plastic base lightest, steel heaviest |
| 550 gal | 230–280 lb | Steel skid |
| 350 gal stainless | 350–420 lb | Varies by design |
Typical ranges only. Where it matters, weigh the unit or ask the supplier for the tare of the actual lot.
Questions people actually ask
How do I calculate the weight of a full IBC tote?
Gallons × 8.345 lb × specific gravity, plus the tare weight. For water in a 275 gallon tote with a 128 lb tare that is 275 × 8.345 × 1.0 + 128 = about 2,420 lb.
Can I fill a 275 gallon tote with sulphuric acid?
Not necessarily to 275 gallons. At SG 1.83 a full tote would gross about 4,330 lb, so compare that with the maximum permissible gross mass on the unit’s marking and reduce the fill if needed. Confirm chemical compatibility, the gasket material and current regulations as well.
How much headspace should I leave?
Enough for the liquid to expand at the highest temperature it will see in storage or transit — never fill to the brim. The SDS and current transport regulations set the limits for regulated products.
What does the Y in UN 31HA1/Y mean?
It shows the packing groups the design type was tested for — Y covers packing groups II and III. Full decode on the UN markings decoder.
Extended specific gravity table
The main table covers the most common products. These are the ones that come up next.
| Product | Typical SG | Liquid weight (lb) |
|---|---|---|
| Acetic acid, glacial | 1.05 | 2,410 |
| Antifreeze, 50/50 premix | 1.07 | 2,456 |
| Battery acid (sulphuric 37%) | 1.28 | 2,937 |
| Beer wort, 12 °P | 1.05 | 2,410 |
| Bleach, household 5% | 1.08 | 2,478 |
| Brake fluid DOT 4 | 1.07 | 2,456 |
| Calcium chloride 32% | 1.32 | 3,029 |
| Canola oil | 0.92 | 2,111 |
| Citric acid 50% | 1.24 | 2,846 |
| Coconut oil (melted) | 0.92 | 2,111 |
| Dextrose solution 70% | 1.35 | 3,098 |
| Diesel exhaust fluid (DEF, urea 32.5%) | 1.09 | 2,501 |
| Epoxy resin, unmixed | 1.16 | 2,662 |
| Ethanol 95% | 0.81 | 1,859 |
| Ethyl acetate | 0.90 | 2,065 |
| Formaldehyde 37% | 1.09 | 2,501 |
| Glycerine 80% | 1.21 | 2,777 |
| Hydrogen peroxide 35% | 1.13 | 2,593 |
| Lactic acid 88% | 1.21 | 2,777 |
| Magnesium chloride 30% | 1.30 | 2,983 |
| Methanol | 0.79 | 1,813 |
| Mineral spirits | 0.78 | 1,790 |
| Molasses, blackstrap | 1.42 | 3,259 |
| Monoethanolamine (MEA) | 1.02 | 2,341 |
| Nitric acid 42% | 1.26 | 2,892 |
| Olive oil | 0.92 | 2,111 |
| Phosphoric acid 54% | 1.38 | 3,167 |
| Potassium hydroxide 45% | 1.46 | 3,351 |
| Sodium chlorite 25% | 1.21 | 2,777 |
| Sodium thiosulphate 32% | 1.28 | 2,937 |
| Tallow, melted | 0.90 | 2,065 |
| Vinegar, 20% acetic | 1.03 | 2,364 |
| Xylene | 0.86 | 1,974 |
Liquid weight = 275 × 8.345 × SG. Always confirm against your own safety data sheet: specific gravity varies with concentration and temperature, and the SDS is the controlling document. A listed product is not a statement that it is compatible with HDPE or suitable for a given tote — check compatibility and current regulations.
Four weight calculations with worked examples
Example 1 — can my mezzanine take it?
Two 275 gallon totes of 32% calcium chloride (SG 1.32), each with a 128 lb tare, on a mezzanine rated 150 lb/sq ft.
Gross each = 275 × 8.345 × 1.32 + 128 = 3,157 lb. Two units = 6,314 lb over 26.7 sq ft = about 237 lb/sq ft. That is about 58% over the rating. The answer is no, and it is not close.
Example 2 — what fill level stays inside the plate?
Sulphuric acid 93% (SG 1.83) in a tote with a 128 lb tare and a marked maximum gross mass of 2,000 kg (4,409 lb).
Max liquid weight = 4,409 − 128 = 4,281 lb. Max gallons = 4,281 ÷ (8.345 × 1.83) = about 280 gal, so a 275 gallon fill is inside this plate — but only just. On a unit marked 1,770 kg (3,902 lb), the same sum gives about 247 gallons, and the fill must be reduced. Always use your own unit’s figure.
Example 3 — will my pallet jack lift it?
A 330 gallon tote with a 152 lb tare, full of liquid fertiliser at SG 1.32, on a 5,500 lb jack.
Gross = 330 × 8.345 × 1.32 + 152 = 3,787 lb. Inside the jack rating, but jack ratings assume level ground; on a dock ramp the effective demand rises sharply.
Example 4 — how much does a bay of totes weigh?
Forty 275 gallon totes of water in a warehouse bay.
40 × 2,420 = 96,800 lb — over 48 tons — on about 533 sq ft if packed tight, which is about 182 lb/sq ft. Usually fine on a ground slab, and worth knowing before anyone asks.
Weight questions
Does temperature change the weight?
Not the mass, but it changes the volume — a warm liquid occupies more space at the same weight, which is why headspace exists. The gross figure you calculate is the one that matters for structures.
How dense a product can go in a poly tote?
That is set by the design type: the maximum permissible gross mass on the UN marking, and the maker’s approved specific gravity where stated. Dense products usually need a reduced fill. Check the unit and current regulations.
How do I mark a reduced fill level?
A permanent line on the bottle, a written note on the label, and the figure in your filling procedure. All three, because any one of them alone gets missed on a busy day.
Four more worked calculations
1. Will a box truck take eight full totes?
Eight × 2,420 lb = 19,360 lb of product and totes. Compare that with the truck’s rated payload, not its floor space: a truck with a 10,000 lb payload can carry four (9,680 lb), not eight.
2. How much does a full pallet rack bay weigh?
Two totes of water per level, two levels: 4 × 2,420 = 9,680 lb in one bay, or about 4,840 lb per beam level. Each beam level must be rated for that — check the rating plate.
3. What does a tote of honey weigh?
Honey at SG 1.42 in a tote with a 128 lb tare: 275 × 8.345 × 1.42 + 128 = 3,387 lb. It is also thick when cold, so warm it before trying to pump it.
4. How many gallons fit in a tote marked 1,770 kg gross?
1,770 kg = 3,902 lb. Less a 128 lb tare = 3,774 lb of liquid. For a product at SG 1.6: 3,774 ÷ (8.345 × 1.6) = 283 gallons — more than nominal, so volume is the limit, not weight. For SG 1.9: 238 gallons, and weight is the limit. Always check both.
More weight questions
Does the cage carry the weight or the bottle?
In storage, the cage carries the stacking load and the pallet carries the gross weight to the floor. The bottle carries its own contents and is not a structural element, which is why a bent cage is dangerous — it transfers load into the bottle.
How do I weigh a tote without a scale?
Calculate it. Gallons × 8.345 × SG + tare is close enough for planning, provided you use the real specific gravity from the SDS and the real tare.
What is the densest product a poly tote can hold?
That depends on the design: check the maximum permissible gross mass on the UN marking and any maximum specific gravity the maker states. Dense products usually need a reduced fill.
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