Weight to Volume Calculator

Convert weight to volume or volume to weight for common materials using density, with results in liters, gallons, cups, cubic feet, and fluid ounces.

• All Unit Converters
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• Circle Volume Calculator

Calculator Functions

Function	What it does	What it requires
Volume from weight	Converts a weight to the volume it takes up	Requires the weight and a substance from the list, or a custom density
Weight from volume	Converts a volume to its weight	Requires the volume and a substance from the list, or a custom density
Density from weight and volume	Finds the density of a sample	Requires the weight and the volume of the same sample

Weight is entered as a mass in g, kg, mg, oz, lb, US tons or metric tons. Volume is entered in mL, L, US teaspoons, tablespoons, fluid ounces, cups, pints, quarts or gallons, or in in³, ft³ or m³. A custom density can be given in g/mL, kg/m³, lb/ft³ or lb/US gal. Optional settings choose the result unit and switch the weight entry to a gravitational force in N, kN or lbf.

Weight to Volume Formulas

Volume from weight

The mass is divided by the density. 500 g of water at 0.998 g/mL takes up 501 mL, while 250 g of all-purpose flour at 0.53 g/mL takes up about 472 mL, close to 2 US cups.

Weight from volume

The volume is multiplied by the density. One US gallon of water is 3,785.41 mL × 0.998 g/mL = 3,777.84 g, or 8.33 lb.

Density from weight and volume

A sample of 100 g that fills 50 mL has a density of 2 g/mL. The result is also shown in kg/m³, lb/ft³ and lb/US gal.

Typical densities in the substance list

Substance	g/mL	lb/US gal	kg/m³
Water	0.998	8.33	998
Seawater	1.025	8.55	1,025
Milk	1.035	8.64	1,035
Vegetable oil	0.92	7.68	920
Honey	1.42	11.85	1,420
All-purpose flour (bulk)	0.53	4.42	530
Granulated sugar (bulk)	0.85	7.09	850
Butter	0.911	7.60	911
Table salt (bulk)	1.22	10.18	1,220
Ethanol	0.789	6.58	789
Gasoline	0.74	6.18	740
Diesel	0.85	7.09	850
Ice	0.917	7.65	917
Dry sand (bulk)	1.6	13.35	1,600
Gravel (bulk)	1.68	14.02	1,680
Concrete	2.4	20.03	2,400
Aluminum	2.7	22.53	2,700
Steel	7.85	65.51	7,850
Gold	19.32	161.23	19,320

Water at 0.998 g/mL is its density at about 21 °C (70 °F) [1]. Flour, sugar, salt, sand and gravel are bulk densities, which include the air between the grains.

Weight entered as a force

A weight in newtons is a force, so it is first converted to a mass in kg by dividing by gravity [3]. The calculator uses standard gravity, 9.80665 m/s² [2], with 9.81 m/s² or a custom value as alternatives. A force of 50 N is a mass of 5.099 kg. A weight entered in grams or pounds is already a mass and is not divided by gravity.

How to Convert Weight to Volume

Find the density of the substance, put the weight and the density in matching units, and divide the weight by the density. For the reverse, multiply the volume by the density. Weight and volume only convert through density, which is why 1 kg of honey fills about 0.7 L and 1 kg of flour fills about 1.9 L.

Limits of This Estimate

• The densities in the list are typical values, not measurements of a particular sample. Temperature, moisture, composition and how tightly a powder or aggregate is packed all change the real figure. These estimates are based on the best available data and estimations.
• A measured density, entered as Custom measured density, gives a better answer than a list value. Water, for example, ranges from 0.99987 g/mL at 0 °C to 0.95865 g/mL at 100 °C [1].
• Ounces (oz) are a mass and fluid ounces (fl oz) are a volume. Cups, spoons, pints, quarts and gallons are US measures.

Sources