One US gallon of 35% hydrogen peroxide solution weighs approximately 9.44 pounds (4.28 kilograms) at 20°C/68°F. That is the liquid alone. A filled bottle, packed case, or complete pallet weighs more because it includes packaging.
The 9.44-pound figure comes from Solvay’s manufacturer data, table one. It is a reference value for that concentration and temperature, not a verified shipping weight for a particular order.
Why you may find several different answers
A search for peroxide weight can turn up a liquid-density calculator, a bottle listing, or a shipping specification. Before comparing the numbers, check what each one measures:
- Concentration: a value for pure hydrogen peroxide does not describe a 3%, 12%, or 35% solution in water.
- Volume unit: this article uses US liquid gallons. Check whether another source uses US or imperial gallons.
- Temperature: density depends on temperature. Keep the reference temperature with the number.
- Contents included: “item weight” or “shipping weight” may include the container or other packaging. Ask the seller if the listing is unclear.
Evonik’s physical-properties table confirms that different peroxide concentrations have different densities. For a different strength, obtain the density for the specific product instead of reusing the 35% figure.
Liquid weight, case weight, and pallet weight
- Net liquid weight
- The mass of the entire peroxide-and-water solution, excluding its container. “35%” describes the solution’s concentration; it does not mean that only 35% of the gallon counts toward its weight.
- Packed bottle or case weight
- The liquid plus the bottles, closures, carton, and any other packaging included in that packed unit.
- Total pallet weight
- All the packed units plus the pallet and any additional shipping materials. Confirm which materials are already included so nothing is counted twice.
Liquid + all packaging = total gross weight
This distinction matters for freight paperwork. FedEx Freight’s bill-of-lading instructions, item 21, specify commodity weight including the crate or pallet. A calculated liquid weight cannot stand in for a verified shipment total.
A four-gallon example
In this hypothetical example, an order contains four US gallons of 35% solution at the reference temperature:
4 × 9.44 lb = 37.76 lb, or about 37.8 lb of liquid.
That calculation does not establish the packed case weight. It also does not tell you how many cases fit on a pallet. Those answers require the actual packaging and shipment configuration.
For the separate task of comparing bottle quantities and total volume, use our bottle sizes, packs, and unit-price guide.
What to ask your supplier before arranging freight
Request these details for the exact order:
- The product concentration, bottle volume, and bottle count.
- The packed weight per case and the number of cases.
- The number of pallets and verified gross weight of each complete pallet, including all shipping materials.
- Confirmation that the quoted weights describe your order rather than a different pack configuration.
Keep those details with the order paperwork for your receiving check. Ask for verified gross weights rather than adding a standard allowance for bottles or pallets. You do not need to open containers or transfer concentrated peroxide to resolve a shipping-weight question.
If you are ordering 35% food-grade hydrogen peroxide, identify the selected pack when requesting those details. Use 9.44 lb per US gallon for an approximate liquid-only reference, and the supplier’s confirmed packed shipment weight for freight planning.
