Verification: factors follow standard unit definitions; round for display only.

Cubic feet to liters

Convert cu ft to L when an HVAC manual, natural gas bill, shipping quote, or appliance spec lists cubic feet but you need liters for metric comparisons, EU documentation, or SI lab work.

The cubic foot (ft³) is a US customary and imperial unit of volume equal to the space occupied by a cube measuring one foot on each side. Under the modern inch– meter definition, one cubic foot equals exactly 28.316846592 liters. That factor chains from 1 ft = 0.3048 m exactly, so 1 ft³ = (0.3048 m)³ = 0.028316846592 m³ = 28.316846592 L.

liters = cubic feet × 28.316846592

Multiplication by 28.316846592 is preferred when you want an exact rational result. Multiplying by the rounded 28.317 gives the same answer within normal calculator precision for everyday HVAC and shipping estimates.

Step-by-step conversion (worked example 1)

Convert 1 cu ft to liters—the exact definition anchor:

1. Write the formula: L = cu ft × 28.316846592
2. Multiply: 1 × 28.316846592 = 28.316846592 L exactly
3. Round-trip check: 28.316846592 ÷ 28.316846592 = 1 cu ft ✓

Step-by-step conversion (worked example 2)

Convert 10 cu ft to liters—a compact refrigerator freezer compartment or small shipping carton:

1. Apply: 10 × 28.316846592 = 283.16846592 L
2. Display round: about 283 L (or 283.2 L for appliance labels)
3. Context: a “10 cu ft” fridge spec means roughly 283 L internal volume—not 10 liters
4. Verify: 283.16846592 ÷ 28.316846592 = 10 cu ft ✓

Step-by-step conversion (worked example 3)

Convert 100 cu ft to liters—a common natural gas billing block (one “therm” context) or medium HVAC duct run volume:

1. Multiply: 100 × 28.316846592 = 2831.6846592 L
2. Equivalent: 100 cu ft ≈ 2.83 m³ (since 1000 L = 1 m³)
3. Natural gas note: US utilities often bill in “ccf” (100 cubic feet) or therms; 1 ccf = 100 cu ft = 2831.68 L at standard conditions

Quick mental estimate (no calculator)

For a fast approximation, multiply cubic feet by 28 instead of 28.317. Example: 5 cu ft × 28 = 140 L (exact: 141.6 L—about 1.1% low). For slightly finer rough work, multiply by 30 and subtract 5%: 5 × 30 = 150, minus 5% ≈ 142.5 L. Use the exact factor for billing disputes, HVAC load calculations, and freight contracts.

Anchor values every converter should match

Where cubic feet → liters comes up

• HVAC & airflow: US equipment rates airflow in cubic feet per minute (CFM) and duct sizing in cubic feet of plenum volume. Converting 50 cu ft plenum → 1416 L helps compare with metric fan curves and EU ventilation standards stated in liters per second.
• Natural gas billing: US utilities bill residential gas in therms or ccf (hundred cubic feet). One ccf = 100 cu ft = 2831.68 L at standard temperature and pressure. Converting helps compare US gas usage with metric energy audits listed in cubic meters.
• Shipping & freight: US carriers quote dimensional weight using cubic inches or cubic feet; international freight forwarders use liters or cubic meters. Converting 4 cu ft parcel → 113.27 L aligns US box dimensions with metric volumetric weight tiers.
• Refrigerator & appliance specs: US appliance labels list internal volume in cubic feet (e.g. “18 cu ft refrigerator”); EU models list liters. Converting 18 cu ft → 509.7 L lets you compare capacity when shopping across markets.

Liters to cubic feet

Convert L to cu ft when a metric datasheet, EU appliance label, or laboratory volume lists liters but you need cubic feet for US HVAC equipment, natural gas contracts, or shipping documentation.

Reverse the cubic-foot-to-liter process: divide liters by 28.316846592. Because the cubic foot is defined through the exact foot–meter relationship, this direction is equally exact—precision limits come from your input measurement, not from the conversion factor.

cubic feet = liters ÷ 28.316846592  ·  equivalently   cubic feet = liters × 0.03531466672

Step-by-step conversion (worked example)

Convert 500 L to cubic feet—a large beverage batch or small storage tank:

1. Write the formula: cu ft = L ÷ 28.316846592
2. Divide: 500 ÷ 28.316846592 = 17.65733 cu ft
3. Practical read: about 17.7 cu ft—compare with a mid-size refrigerator compartment
4. Round-trip check: 17.65733 × 28.316846592 ≈ 500 L ✓

Quick mental estimate (reverse direction)

Approximation: divide liters by 28 instead of 28.317. Example: 280 L ÷ 28 = 10 cu ft (exact: 9.89 cu ft). Good for rough HVAC sizing; use 28.316846592 for billing reconciliation and freight contracts.

Quick reference (L → cu ft)

Reverse conversion is essential when metric procurement arrives in liters but site teams still plan duct volumes, gas storage, and shipping tiers in cubic feet.

Cubic feet vs liters, common mistakes, and related tools

Cubic feet and liters measure the same physical quantity—volume—but anchor to different unit systems. Confusing them with linear feet, or with US liquid gallons, produces order-of-magnitude errors in HVAC, billing, and freight.

Cubic feet vs liters at a glance

Common mistakes to avoid

• Confusing cubic feet with linear feet—a “10 ft” duct length is not 10 cu ft of volume. Volume requires three dimensions (length × width × height). A 10 ft × 1 ft × 1 ft duct run holds 10 cu ft = 283 L.
• Using 28.3 or 30 as a rough factor without labeling it approximate— fine for mental math, but billing disputes and freight claims need 28.316846592.
• Mixing cubic feet with US gallons directly—1 US gal = 0.133681 cu ft (not 1 cu ft). Chain through liters or use US gallons to cubic feet for gallon-level conversions.
• Ignoring standard conditions on gas volumes—natural gas ccf and Mcf volumes are referenced at defined temperature and pressure. Converting ccf → liters gives volumetric equivalence; energy content (therms) requires the gas heat content too.
• Assuming refrigerator “cu ft” is external dimensions—appliance specs list internal storage volume in cubic feet. External width/height in inches does not directly equal the cu ft rating.
• Rounding too early in freight calculations—convert at full precision, then round once for the bill of lading. Stacked rounding in multi-carton shipments can shift dimensional weight tiers.

Exactness and round-trip verification

The factor 28.316846592 is exact under the modern foot definition (1 ft = 0.3048 m). Converting 10 cu ft → 283.168 L → 10 cu ft should recover the original within floating-point limits. Test anchors: 1 cu ft = 28.316846592 L exactly; 1000 L ≈ 35.315 cu ft; 1 m³ = 35.31466672 cu ft.

Related volume converters

For the inverse of this page, open liters to cubic feet. For adjacent workflows, see cubic meters to liters, cubic meters to cubic feet, US gallons to cubic feet, cubic feet to US gallons, and US gallons to liters.