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

Rate this converter

Instant calculation with 0ms overhead

Popular Converters

Live Conversion • ISO 80000-3:2019 Certified

1 Barrel (US) = 31.5 Gallon (US)

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

Decimals:

Certified Authority Value

31.50000000

gal (US)

From / Input

bbl (US)

Swap to Gallon (US) to Barrel (US)

To / Result

gal (US)

Quick Values:

Conversion Formula

To convert Barrel (US) to Gallon (US), multiply by 31.5

bbl (US) × 31.5 = gal (US)

Calculation: 1 bbl (US) × 31.5 = 31.5 gal (US)

Common Barrel (US) to Gallon (US) Calculations

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

Tap any row to calculate

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

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

Barrel (US) to Gallon (US) Conversion Reference Table
Conversion & Equivalent Value	Scientific Notation
0.001 bbl (US) 0.0315 gal (US)	3.15 × 10⁻²
0.01 bbl (US) 0.315 gal (US)	3.15 × 10⁻¹
0.1 bbl (US) 3.15 gal (US)	3.15 × 10⁰
0.5 bbl (US) 15.75 gal (US)	1.575 × 10¹
1 bbl (US) 31.5 gal (US)	3.15 × 10¹
2 bbl (US) 63 gal (US)	6.3 × 10¹
5 bbl (US) 157.5 gal (US)	1.575 × 10²
10 bbl (US) 315 gal (US)	3.15 × 10²
20 bbl (US) 630 gal (US)	6.3 × 10²
25 bbl (US) 787.5 gal (US)	7.875 × 10²
50 bbl (US) 1575 gal (US)	1.575 × 10³
100 bbl (US) 3150 gal (US)	3.15 × 10³
250 bbl (US) 7875 gal (US)	7.875 × 10³
500 bbl (US) 15750 gal (US)	1.575 × 10⁴
1000 bbl (US) 31500 gal (US)	3.15 × 10⁴

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

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

Gallon (US) to Barrel (US) Conversion Reference Table
Reciprocal & Equivalent Value	Scientific Notation
1 gal (US) 0.031746 bbl (US)	3.175 × 10⁻²
5 gal (US) 0.15873 bbl (US)	1.587 × 10⁻¹
10 gal (US) 0.31746 bbl (US)	3.175 × 10⁻¹
50 gal (US) 1.587302 bbl (US)	1.587 × 10⁰
100 gal (US) 3.174603 bbl (US)	3.175 × 10⁰

View Complete 15-Row Gallon (US) to Barrel (US) Table

Real-World Context & Everyday Benchmarks

Tap to load into converter

To help contextualize these units in everyday life, science, and engineering, here are verified real-world reference points for Barrel (US) (bbl (US)) and Gallon (US) (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)

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 Barrel (US) to Gallon (US)

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

Direct Factor1 bbl (US) = 31.5 gal (US)

Inverse Ratio1 gal (US) = 0.031746 bbl (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 bbl (US) = 0.11924 cubic meter (m³)

2. Target SI Bridge (k_target):1 gal (US) = 0.00378541 cubic meter (m³)

Step-by-step substitution for Barrel (US) → Gallon (US):V(gal (US)) = V(bbl (US)) × ( 0.11924 / 0.00378541 ) = V(bbl (US)) × 31.5

Mathematical FormulaValue in Gallon (US) = Value in Barrel (US) × 31.5Direct computational formula applied for standard conversion.

Worked Example

Evaluating an input of 50 Barrel (US) (bbl (US)) produces 1575 Gallon (US) (gal (US)). In heavy-duty utility and industrial workloads, 1000 bbl (US) equals 31500 gal (US).

Inverse check: 1 gal (US) = 0.031746 bbl (US).

Understanding Barrel (US) and Gallon (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 Gallon (US)
Commercial craft brewery standard beer barrel	`1 bbl (US)`	`31.5 gal (US)`
Two standard commercial half-barrel beer kegs combined	`1 bbl (US)`	`31.5 gal (US)`
Traditional distillery whiskey aging oak cask	`1.7 bbl (US)`	`53.55 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 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): bbl (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 bbl (US) at Water (20°C Standard Ambient) = 0.119 kg

Equals 119.03 g • 0.000119 t • 0.2624 lb

SI Mass

0.119

Kilograms

Laboratory Metric

119.03

Grams

Industrial Freight

0.000119

Metric Tons

US Customary

0.2624

Pounds (Avoirdupois)

Postal & Grocery

4.2

Ounces

US Short Ton

0.0001312

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 bbl (US) × 0.11924047 = 0.11924047 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) × (0.11924047 L) = 0.119026 kg
4. Convert to Standard Engineering Units:
• kg: 0.119026 × 1 = 0.119 kg (Kilograms) • g: 0.119026 × 1000 = 119.03 g (Grams) • t: 0.119026 × 0.001 = 0.000119 t (Metric Tons) • lb: 0.119026 × 2.2046 = 0.2624 lb (Pounds (Avoirdupois)) • oz: 0.119026 × 35.274 = 4.2 oz (Ounces) • ton (US): 0.119026 × 0.001102 = 0.0001312 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 31.5 gallons (us) (gal (US)) in 1 barrel (us) (bbl (US)). To calculate larger amounts manually, simply multiply your total number of barrels (us) by the conversion multiplier of 31.5.

The mathematical formula to convert barrels (us) to gallons (us) is: [value] * 31.5 = 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 barrels (us), you must divide your starting value by 31.5. Our bidirectional tool automatically computes this inverse equation the moment you type into the gallon (us) input field.

1 Barrel (US) is larger than 1 Gallon (US). Specifically, 1 Barrel (US) equals exactly 31.5 gallons (us), making it 31.5 times larger (a difference of 1.50 orders of magnitude). Therefore, quantities expressed in gallons (us) require a larger numerical value to represent the same physical amount.

A typical commercial craft brewery standard beer barrel measures 1 bbl (US), which corresponds to 31.5 gal (US) (Gallon (US)).