Gallons (US) to Barrels (US) Converter (gal (US) to bbl (US))

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Live Conversion • ISO 80000-3:2019 Certified

1 Gallon (US) = 0.031746032 Barrel (US)

1 gal (US) = 0.031746 bbl (US) • 1 bbl (US) = 31.5 gal (US)

Decimals:

Certified Authority Value

0.03174603

bbl (US)

From / Input

gal (US)

Swap to Barrel (US) to Gallon (US)

To / Result

bbl (US)

Quick Values:

Conversion Formula

To convert Gallon (US) to Barrel (US), multiply by 0.031746032

gal (US) × 0.031746032 = bbl (US)

Calculation: 1 gal (US) × 0.031746032 = 0.031746032 bbl (US)

Common Gallon (US) to Barrel (US) Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between Gallon (US) (gal (US)) and Barrel (US) (bbl (US)).

Tap any row to calculate

Gallon (US) to Barrel (US): Primary Direct Table (15 Steps)

Rule: 1 Gallon (US) is equal to 0.031746 bbl (US) (Barrel (US))

Gallon (US) to Barrel (US) Conversion Reference Table
Conversion & Equivalent Value	Scientific Notation
0.001 gal (US) 3.174603 × 10⁻⁵ bbl (US)	3.175 × 10⁻⁵
0.01 gal (US) 0.00031746 bbl (US)	3.175 × 10⁻⁴
0.1 gal (US) 0.0031746 bbl (US)	3.175 × 10⁻³
0.5 gal (US) 0.015873 bbl (US)	1.587 × 10⁻²
1 gal (US) 0.031746 bbl (US)	3.175 × 10⁻²
2 gal (US) 0.0634921 bbl (US)	6.349 × 10⁻²
5 gal (US) 0.15873 bbl (US)	1.587 × 10⁻¹
10 gal (US) 0.31746 bbl (US)	3.175 × 10⁻¹
20 gal (US) 0.634921 bbl (US)	6.349 × 10⁻¹
25 gal (US) 0.793651 bbl (US)	7.937 × 10⁻¹
50 gal (US) 1.587302 bbl (US)	1.587 × 10⁰
100 gal (US) 3.174603 bbl (US)	3.175 × 10⁰
250 gal (US) 7.936508 bbl (US)	7.937 × 10⁰
500 gal (US) 15.873016 bbl (US)	1.587 × 10¹
1000 gal (US) 31.746032 bbl (US)	3.175 × 10¹

Barrel (US) to Gallon (US): Reciprocal Summary

Rule: 1 Barrel (US) is equal to 31.5 gal (US) (Gallon (US))

Barrel (US) to Gallon (US) Conversion Reference Table
Reciprocal & Equivalent Value	Scientific Notation
1 bbl (US) 31.5 gal (US)	3.15 × 10¹
5 bbl (US) 157.5 gal (US)	1.575 × 10²
10 bbl (US) 315 gal (US)	3.15 × 10²
50 bbl (US) 1575 gal (US)	1.575 × 10³
100 bbl (US) 3150 gal (US)	3.15 × 10³

View Complete 15-Row Barrel (US) to Gallon (US) 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 Gallon (US) (gal (US)) and Barrel (US) (bbl (US)):

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)

Barrel (US) References:

Commercial craft brewery standard beer barrel 1 bbl (US)
Two standard commercial half-barrel beer kegs combined 1 bbl (US)
Traditional distillery whiskey aging oak cask 1.7 bbl (US)

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

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

How to Convert Gallon (US) to Barrel (US)

Converting Gallon (US) (gal (US)) to Barrel (US) (bbl (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 Gallon (US) equals 0.031746 Barrel (US), while 1 bbl (US) equals 31.5 gal (US).

Direct Factor1 gal (US) = 0.031746 bbl (US)

Inverse Ratio1 bbl (US) = 31.5 gal (US)

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:

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 (k_source):1 gal (US) = 0.00378541 cubic meter (m³)

2. Target SI Bridge (k_target):1 bbl (US) = 0.11924 cubic meter (m³)

Step-by-step substitution for Gallon (US) → Barrel (US):V(bbl (US)) = V(gal (US)) × ( 0.00378541 / 0.11924 ) = V(gal (US)) × 0.031746

Mathematical FormulaValue in Barrel (US) = Value in Gallon (US) × 0.031746032Direct computational formula applied for standard conversion.

Worked Example

For an engineering input of 8 gal (US), applying the conversion factor yields exactly 0.253968 bbl (US). At larger operational scale, 10000 Gallon (US) corresponds to 317.460317 bbl (US).

Inverse check: 1 bbl (US) = 31.5 gal (US).

Understanding Gallon (US) and Barrel (US)

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 Reference	Reference Value	Converted to Barrel (US)
Standard grocery supermarket plastic whole milk jug	`1 gal (US)`	`0.031746 bbl (US)`
Office commercial water cooler bottled replacement jug	`5 gal (US)`	`0.15873 bbl (US)`
Compact passenger commuter sedan fuel tank capacity	`14 gal (US)`	`0.444444 bbl (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 Displacement & Bulk Freight

Volume to Material Mass & Freight Bridge (Kilograms • Grams • Metric Tons • Pounds)

Calculate physical shipping mass and material weight m = ρ × V across industrial liquids and solids, converting input volume to mass via material density (ρ).

Input Fluid / Bulk Volume (V): gal (US)

Select Substance Density: 998.2 kg/m³

Governing Law: m = ρ × V

Vector: [L] × [kg/m³] × 10⁻³ → [kg]

Live Calculated Bridge Equivalent:

1 gal (US) at Water (20°C Standard Ambient) = 0.003779 kg

Equals 3.78 g • 3.7786 × 10⁻⁶ t • 0.00833 lb

SI Mass

0.003779

Kilograms

Laboratory Metric

3.78

Grams

Industrial Freight

3.7786 × 10⁻⁶

Metric Tons

US Customary

0.00833

Pounds (Avoirdupois)

Postal & Grocery

0.13

Ounces

US Short Ton

4.1652 × 10⁻⁶

ton (US)

Short Tons (2,000 lb)

Step-by-Step Numerical Derivation Proof View Derivation

1. Normalize Input to SI Base Unit (L):
V = 1 gal (US) × 0.00378541 = 0.00378541 L
2. Apply Engineering Parameter (ρ):
Selected condition: Water (20°C Standard Ambient) at ρ = 998.2 kg/m³
3. Execute Governing Physical Law in SI Units:
m = ρ × V = (0.001 m³/L) × (998.2 kg/m³) × (0.00378541 L) = 0.0037786 kg
4. Convert to Standard Engineering Units:
• kg: 0.0037786 × 1 = 0.003779 kg (Kilograms) • g: 0.0037786 × 1000 = 3.78 g (Grams) • t: 0.0037786 × 0.001 = 3.7786 × 10⁻⁶ t (Metric Tons) • lb: 0.0037786 × 2.2046 = 0.00833 lb (Pounds (Avoirdupois)) • oz: 0.0037786 × 35.274 = 0.13 oz (Ounces) • ton (US): 0.0037786 × 0.001102 = 4.1652 × 10⁻⁶ ton (US) (Short Tons (2,000 lb))

Explore Full Density Converter →

Engineering Substance / Operating Standard	Parameter Value (kg/m³)	Reference State / Condition	Typical Industrial & Engineering Application
Water (20°C Standard Ambient)	`998.2`	998.2 kg/m³	Standard hydronic water density
Diesel Fuel (EN 590)	`832`	832.0 kg/m³	Automotive & generator fuel
Gasoline / Petrol (ASTM D4814)	`740`	740.0 kg/m³	Light motor fuel
Hydraulic Fluid (ISO VG 46)	`870`	870.0 kg/m³	Industrial machine fluid
Fresh Cured Concrete	`2400`	2,400 kg/m³	Civil engineering mix
Structural Steel	`7850`	7,850 kg/m³	Solid carbon steel

Frequently Asked Questions

There are exactly 0.031746032 barrels (us) (bbl (US)) in 1 gallon (us) (gal (US)). To calculate larger amounts manually, simply multiply your total number of gallons (us) by the conversion multiplier of 0.031746032.

The mathematical formula to convert gallons (us) to barrels (us) is: [value] * 0.031746032 = barrels (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 barrels (us) back to gallons (us), you must divide your starting value by 0.031746032. Our bidirectional tool automatically computes this inverse equation the moment you type into the barrel (us) input field.

1 Barrel (US) is larger than 1 Gallon (US). Specifically, 1 Gallon (US) equals 0.031746032 barrels (us), meaning 1 Barrel (US) is 31.5 times larger than 1 Gallon (US) (a difference of 1.50 orders of magnitude). Expressing measurements in gallons (us) requires a larger numerical value to represent the equivalent physical magnitude.

A typical standard grocery supermarket plastic whole milk jug measures 1 gal (US), which corresponds to 0.03175 Barrel Us (Barrel (US)).