HesapHanem

Cubic Feet to Liters Converter

Enter a volume and choose the conversion direction.

How it is calculated

The tool multiplies your number by a fixed factor: litres = ft³ × 28.316846592 in the default direction, and ft³ = litres × 0.0353146667 when you switch to litres to cubic feet. The value is a volume (cubic feet or litres) and the factor comes from the definition of the foot as 0.3048 m, cubed and expressed in litres (1 m³ = 1000 L). The answer is rounded to 4 decimal places and shown with its unit. Zero returns 0.0000 and negative numbers keep their sign, so the tool does not check whether a volume makes physical sense. Note that this is the US/international cubic foot; it is not a liquid gallon or barrel conversion.

Worked example

Suppose a fermenter is listed as 2.5 ft³ and you want its capacity in litres. With the direction set to cubic feet to litres: 2.5 × 28.316846592 = 70.79211648. Rounded to four decimals, the tool shows 70.7921 L. Going back the other way, 70.7921 L × 0.0353146667 gives about 2.5 ft³ again, which is a quick sanity check.

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Common mistakes

  • Leaving the direction on cubic feet to litres when the number you typed is already in litres. The result is then about 28 times too large instead of about 28 times too small.
  • Confusing cubic feet with linear or square feet. A box 2 ft on each side is 8 ft³ (about 226.5 L), not 2 ft³.
  • Mixing the foot with the inch. 1 ft³ is 1,728 in³, so 100 in³ is only about 1.64 L, not a cubic-foot figure.
  • Treating the 4-decimal output as extra precision. If your source figure was rounded (for example 'about 3 ft³'), quote the litres to a similar number of digits.

About this calculator

The conversion uses the exact volumetric relationship 1 cubic foot = 28.316846592 liters (derived from 1 foot = 0.3048 meters, cubed, then converted to liters), so converting either direction is a straight multiplication or division by that constant.

HVAC technicians use it when reconciling airflow or tank capacity specs given in cubic feet with equipment rated in liters, homebrewers and fermenter owners use it when a US recipe or fermenter volume is in cubic feet but their measuring equipment is metric, and shipping and logistics coordinators use it to convert container or crate volumes between the cubic-foot figures common in US freight paperwork and the litre-based figures used internationally.

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Comments (1)

  • Editorial team

    Appliance labels are a common place to meet cubic feet. An 18 ft³ refrigerator comes to about 509.7 L, which you can compare with a metric model's rated litres. Before comparing, find out which volume each figure describes, since a stated capacity can mean total or usable space. A box or room volume is a different quantity again from a liquid measure. What are you converting?

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