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Cubic Foot to Gallon (US) (ft³ to gal (US)) Calculator & Formula

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Live Conversion • ISO 80000-3:2019 Certified
1 Cubic Foot = 7.48051948 Gallon (US)
1 ft³ = 7.480519 gal (US) • 1 gal (US) = 0.133681 ft³
Cubic Foot to Gallon (US): One Cubic Foot is equal to 7.48051948 Gallons (US).
Certified Authority Value
7.48051948
gal (US)
Exact: 1 gal (US) ≡ 0.1336805556 ft³
ft³
ft³
Swap to Gallon (US) to Cubic Foot
gal (US)
gal (US) 7.48051948
Quick Values:
1 ft³ 5 ft³ 10 ft³ 25 ft³ 50 ft³ 100 ft³ 250 ft³ 500 ft³ 1,000 ft³
Conversion Formula
To convert Cubic Foot to Gallon (US), multiply by 7.48051948
ft³ × 7.48051948 = gal (US)

Calculation: 1 ft³ × 7.48051948 = 7.48051948 gal (US)

Common Cubic Foot to Gallon (US) Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between Cubic Foot (ft³) and Gallon (US) (gal (US)).

Tap any row to calculate
Gallon (US) to Cubic Foot: Reciprocal Summary
Gallon (US) to Cubic Foot Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 gal (US) is equal to 0.133681 ft³ (Cubic Foot) 1.337 × 10⁻¹
5 gal (US) is equal to 0.668403 ft³ (Cubic Foot) 6.684 × 10⁻¹
10 gal (US) is equal to 1.336806 ft³ (Cubic Foot) 1.337 × 10⁰
50 gal (US) is equal to 6.684028 ft³ (Cubic Foot) 6.684 × 10⁰
100 gal (US) is equal to 13.368056 ft³ (Cubic Foot) 1.337 × 10¹
View Complete 15-Row Gallon (US) to Cubic Foot Table

Real-World Context & Everyday Benchmarks

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To help contextualize these units in everyday life, science, and engineering, here are verified real-world reference points for Cubic Foot (ft³) and Gallon (US) (gal (US)):

Cubic Foot References:

  • Countertop residential kitchen microwave oven interior 1.5 ft³
  • Standard built-in kitchen dishwasher washing volume 10 ft³
  • Large French door home food refrigerator volume 25 ft³

Gallon (US) References:

  • Standard grocery supermarket plastic whole milk jug 1 gal (US)
  • Office commercial water cooler bottled replacement jug 5 gal (US)
  • Compact passenger commuter sedan fuel tank capacity 14 gal (US)

Tap any benchmark above to automatically calculate its exact equivalent in Gallon (US).

ISQ Dimension: [L³] Coherent SI Unit: cubic meter (m³) Classical Mechanics & Dimensional Metrology

How to Convert Cubic Foot to Gallon (US)

Converting Cubic Foot (ft³) to Gallon (US) (gal (US)) is a core calculation in Volume and Capacity, which measures the three-dimensional space enclosed within a boundary or occupied by a solid, liquid, or gas. This calculation navigates the boundary between the International Metric System (SI) and British Imperial / US Customary engineering standards. In contemporary metrology, Imperial units are defined in terms of exact SI standards via international agreements—notably NIST SP 811 and the 1959 International Yard and Pound Agreement. Exactly 1 Cubic Foot equals 7.480519 Gallon (US), while 1 gal (US) equals 0.133681 ft³.

Direct Factor1 ft³ = 7.480519 gal (US)
Inverse Ratio1 gal (US) = 0.133681 ft³
Conversion ScaleMetric SI to British Imperial / US Customary Bridge
First-Principles SI Derivation ProofNIST SP 811 / ISO 80000 Compliance

Mathematical Conversion Derivation via Coherent SI Base Unit

Under the International System of Quantities (ISQ), dimensional conversion between non-SI units is rigorously resolved by bridging through the coherent SI base unit (cubic meter (m³)) without arbitrary rounding:

Vtarget=Vsource×(ksource→SIktarget→SI)V_{\text{target}} = V_{\text{source}} \times \left( \frac{k_{\text{source} \to \text{SI}}}{k_{\text{target} \to \text{SI}}} \right)
Universal Dimensional Conversion Law (ISO 80000 / NIST SP 811)
1. Source SI Bridge (ksource):1 ft³ = 0.0283168 cubic meter (m³)
2. Target SI Bridge (ktarget):1 gal (US) = 0.00378541 cubic meter (m³)
Step-by-step substitution for Cubic Foot → Gallon (US):V(gal (US)) = V(ft³) × ( 0.0283168 / 0.00378541 ) = V(ft³) × 7.480519
Mathematical FormulaValue in Gallon (US) = Value in Cubic Foot × 7.48051948Direct computational formula applied for standard conversion.
Worked Example

For an engineering input of 8 ft³, applying the conversion factor yields exactly 59.844156 gal (US). At larger operational scale, 10000 Cubic Foot corresponds to 74805.194805 gal (US).

Inverse check: 1 gal (US) = 0.133681 ft³.

Understanding Cubic Foot and Gallon (US)

Cubic Foot

ft³
Imperial / US

A Cubic Foot (ft³) is an imperial and US customary unit for volume and capacity.

Applications & Practical Context

In practical volume terms, a countertop residential kitchen microwave oven interior equals 1.5 ft³, a standard built-in kitchen dishwasher washing volume equals 10 ft³, a large French door home food refrigerator volume equals 25 ft³.

Physical Setup

A physical magnitude of 1 ft³ corresponds to 0.0283168 m³ in standard SI measurement.

Conversion to SI Unit: cubic meter (m³)
1 ft³ = 0.0283168 m³

Gallon (US)

gal (US)
Imperial / US

A Gallon (US) (gal (US)) is an imperial and US customary unit for volume and capacity.

Applications & Practical Context

In practical volume terms, a standard grocery supermarket plastic whole milk jug equals 1 gal (US), a office commercial water cooler bottled replacement jug equals 5 gal (US), a compact passenger commuter sedan fuel tank capacity equals 14 gal (US).

Physical Setup

A physical magnitude of 1 gal (US) corresponds to 0.00378541 m³ in standard SI measurement.

Conversion to SI Unit: cubic meter (m³)
1 gal (US) = 0.00378541 m³

Domain Metrology & Engineering Applications

Governing Law & Equation

Euclidean 3D Spatial Volume Integration (V = ∭ dx dy dz)

Measurement Instrumentation

Rigorously quantified in laboratory and field settings using gravimetric pycnometers, calibrated volumetric glassware, ultrasonic tank level gauges, and laser volume scanners.

Primary Industry Sectors

Applied across bulk liquid logistics, chemical process engineering, pharmaceutical compounding, and beverage manufacturing under international metrology standard ISO 80000-3:2019, NIST SP 811.

Physical Orders of Magnitude & Laboratory Reference Benchmarks

Physical Phenomenon / Engineering ReferenceReference ValueConverted to Gallon (US)
Countertop residential kitchen microwave oven interior1.5 ft³11.220779 gal (US)
Standard built-in kitchen dishwasher washing volume10 ft³74.805195 gal (US)
Large French door home food refrigerator volume25 ft³187.012987 gal (US)
Institutional Metrology & Standard Authority:

Formulas, conversion coefficients, and base definitions on this page strictly adhere to the ISO 80000-3:2019, NIST SP 811 and the BIPM SI Brochure (9th Edition). Governed by Euclidean 3D Spatial Volume Integration (V = ∭ dx dy dz) under ISO 80000 dimensional vector [L³].

Multi-Variable Engineering Bridge Material Science & Solid Displacement

Mass–Volume–Density Material Bridge (m³ • Liters • Gallons • Cu. Ft • Metric Tons • Pounds)

Calculate solid displacement, storage volume, and shipping mass using the fundamental mass-density relation m = ρ × V, bridging physical mass [M] and bulk volume [L³] via metrological solid density (ρ).

V = m / ρ
Live Calculated Bridge Equivalent:
1 ft³ at Structural Carbon Steel (ASTM A36) = 0.003607 L
Equals 3.607242 × 10⁻⁶ m³ • 0.0009529 gal (US) • 0.0001274 ft³
Fluid / Disp Volume
0.003607
L
Liters
SI Standard
3.607242 × 10⁻⁶
m³
Cubic Meters
US Liquid Standard
0.0009529
gal (US)
US Gallons
Imperial Standard
0.0001274
ft³
Cubic Feet
Civil / Concrete
4.7181 × 10⁻⁶
yd³
Cubic Yards
UK Standard
0.0007935
gal (UK)
Imperial Gallons
  1. 1. Normalize Input to SI Base Unit (kg):
    m = 1 ft³ × 0.02831685 = 0.02831685 kg
  2. 2. Apply Engineering Parameter (ρ):
    Selected condition: Structural Carbon Steel (ASTM A36) at ρ = 7850 kg/m³
  3. 3. Execute Governing Physical Law in SI Units:
    V = m / ρ = (0.02831685) ÷ (7850) = 3.607242 × 10⁻⁶ m³
  4. 4. Convert to Standard Engineering Units:
    • L: 3.607242 × 10⁻⁶ × 1000 = 0.003607 L (Liters) • m³: 3.607242 × 10⁻⁶ × 1 = 3.607242 × 10⁻⁶ m³ (Cubic Meters) • gal (US): 3.607242 × 10⁻⁶ × 264.1721 = 0.0009529 gal (US) (US Gallons) • ft³: 3.607242 × 10⁻⁶ × 35.3147 = 0.0001274 ft³ (Cubic Feet) • yd³: 3.607242 × 10⁻⁶ × 1.308 = 4.7181 × 10⁻⁶ yd³ (Cubic Yards) • gal (UK): 3.607242 × 10⁻⁶ × 219.9692 = 0.0007935 gal (UK) (Imperial Gallons)
Explore Full Density Converter →
Engineering Substance / Operating Standard Parameter Value (kg/m³) Reference State / Condition Typical Industrial & Engineering Application
Structural Carbon Steel (ASTM A36) 7850 20°C, standard mill carbon steel I-beams, rebar, plate & structural fabrication
Aluminum Alloy (6061-T6) 2700 20°C, wrought structural alloy Aerospace, automotive chassis & framing profiles
Pure Electrolytic Copper (ETP C11000) 8940 20°C, ASTM B187 Electrical busbars, wiring & heat exchanger tubing
Reinforced Concrete (Normal Weight) 2400 Cured, standard 28-day stone aggregate Civil engineering foundations, columns & slabs
Water (Pure Metrology Benchmark, 4°C) 1000 4°C, 1 atm (SG = 1.000) Hydraulic displacement calibration & SG standard
Structural Softwood (Dry Pine / Douglas Fir) 500 12% equilibrium moisture content Architectural timber framing & lumber freight
Structural Hardwood (White Oak) 750 Air-dried, 12% moisture Heavy timber construction, rail ties & flooring
Pure Gold Bullion (24K / 99.99%) 19320 20°C, cast bullion standard Precious metals custody & assay verification
Titanium Alloy (Grade 5 Ti-6Al-4V) 4430 Annealed, ASTM B265 Aerospace turbines, airframe forgings & implants
Gray Cast Iron (Class 30) 7200 20°C, ASTM A48 Engine cylinder blocks, pump housings & machine bases
Automotive Gasoline / Petrol (15°C) 740 15°C, ASTM D4814 Fuel tank volume sizing & bunkering logistics
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Frequently Asked Questions

There are exactly 7.48051948 gallons (us) (gal (US)) in 1 cubic foot (ft³). To calculate larger amounts manually, simply multiply your total number of cubic feet by the conversion multiplier of 7.48051948.

The mathematical formula to convert cubic feet to gallons (us) is: [value] * 7.48051948 = gallons (us). Rather than doing the math manually, you can use our high-precision online calculator to process this exact equation instantly without rounding errors.

To perform the reverse calculation from gallons (us) back to cubic feet, you must divide your starting value by 7.48051948. Our bidirectional tool automatically computes this inverse equation the moment you type into the gallon (us) input field.

1 Cubic Foot is larger than 1 Gallon (US). Specifically, 1 Cubic Foot equals exactly 7.48051948 gallons (us), making it 7.4805 times larger (a difference of 0.87 orders of magnitude). Therefore, quantities expressed in gallons (us) require a larger numerical value to represent the same physical amount.

A typical countertop residential kitchen microwave oven interior measures 1.5 ft³, which corresponds to 11.2208 gal (US) (Gallon (US)).

There is exactly 7.48051 gal (US) in 1 ft³. In standard ISO 80000 volume metrology, the equation is 1 ft³ = 7.48051 gal (US).

The conversion calculation is defined as V(gal (US)) = V(ft³) × 7.48051. Multiply the cubic foot value by 7.48051 to obtain the US gallon volume.

To convert in reverse, multiply the volume by the inverse factor: V(ft³) = V(gal (US)) × 0.133681. Consequently, 1 gal (US) equals 0.133681 ft³.

A cubic foot equates to approximately 7.48 US gallons. This specific ratio is structurally critical for civil engineers and fluid dynamicists calculating tank capacities, municipal water flow rates (CFS), and HVAC chiller specifications.

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