Oil Barrel Unit Converter
Instantly convert between barrels, US gallons, liters, metric tons, and cubic meters. Includes live WTI and Brent crude prices to calculate market value.
Oil Barrel Unit Converter
Barrels · Gallons · Liters · Metric Tons · m³
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* Metric ton conversion uses light crude average (API gravity ~35°). Heavy crude differs.
Converted Values
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Conversion factors per industry standard: 1 bbl = 42 US gal = 158.987 L = 0.158987 m³. Metric ton conversion assumes light crude (~35° API gravity). Live prices from OilPriceAPI.com.
How Oil Units Work
The Barrel Standard
The 42-US-gallon barrel has been the petroleum industry standard since the 1860s. It originated from wooden barrels used to transport crude oil in Pennsylvania. Today it underpins every major futures contract and benchmark price worldwide.
Volume vs. Weight
Barrels, gallons, liters, and cubic meters measure volume. Metric tons measure mass (weight). Converting between them requires knowing the oil's density, which varies by crude grade and API gravity. Light crude (~35° API) weighs about 0.8498 kg/liter.
Trading Units
NYMEX WTI futures trade in 1,000-barrel contracts. Tanker cargoes are typically quoted in metric tons or millions of barrels (MMbbl). European refiners often use metric tons while US traders default to barrels—making conversion essential for cross-market analysis.
Common Oil Unit Conversions
| From | Equals |
|---|---|
| 1 barrel | 42 US gallons |
| 1 barrel | 158.987 liters |
| 1 barrel | 0.1364 metric tons |
| 1 barrel | 0.158987 m³ |
| 1,000 barrels | 42,000 gallons |
| 1,000 barrels | 158,987 liters |
| 1 metric ton | 7.33 barrels |
| 1 gallon | 0.02381 barrels |
Metric ton conversion uses light crude average (API gravity ~35°). Heavy crude values will differ.
Frequently Asked Questions
How many gallons are in a barrel of oil?
One barrel of oil contains exactly 42 US gallons. This is the standard petroleum industry measurement established in the 1860s during the Pennsylvania oil boom. In imperial gallons (UK), one barrel equals approximately 34.97 gallons.
How many liters are in a barrel of oil?
One barrel of oil equals 158.987 liters. This is derived from the 42-US-gallon standard, where 1 US gallon = 3.78541 liters. So 42 × 3.78541 = 158.987 liters per barrel.
How do you convert barrels to metric tons?
Converting barrels to metric tons depends on the crude oil's density (API gravity). For light crude oil (around 35° API gravity), 1 barrel ≈ 0.1364 metric tons. For heavier crude (e.g., 25° API), the factor increases to ~0.148 MT/bbl. Always specify the crude grade for precise conversions.
Why do oil prices use barrels instead of liters or gallons?
The barrel became the standard oil unit in the 1860s when Pennsylvania oil producers agreed to use 42-gallon wooden barrels for transport. NYMEX futures contracts are priced per barrel (1,000 barrels per contract), and WTI and Brent benchmarks are quoted in USD per barrel globally, making it the universal trading unit.
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