KG to Barrels Crude Oil Calculator
Convert petroleum mass in kilograms or metric tons (MT) into standard 42-gallon crude oil barrels (bbl) with verified API gravity benchmarks.
1,000 kg (1 Metric Ton) of Brent Blend yields 7.53 Barrels (316.3 US Gallons).
1 Barrel (bbl) = 42 US gallons = 158.987 liters. Standardized under ASTM D1250 and API MPMS Chapter 11.
How Many Barrels of Crude Oil Are in 1 Metric Ton (1,000 kg)?
One metric ton (1,000 kg / 2,204.62 lbs) of light crude oil yields approximately 7.33 to 7.60 standard barrels (bbl). For heavy crude oils (API < 22°), 1 metric ton yields approximately 6.70 to 6.85 barrels due to greater molecular density.
| Crude Grade | API Gravity | Density (kg/L) | bbl per MT (1,000 kg) | US Gallons per MT |
|---|---|---|---|---|
| WTI Light Sweet | 39.6° API | 0.8270 | 7.60 bbl | 319.4 gal |
| Brent Blend | 38.3° API | 0.8350 | 7.53 bbl | 316.3 gal |
| Arab Light | 33.4° API | 0.8580 | 7.33 bbl | 307.8 gal |
| Dubai Fateh | 31.0° API | 0.8710 | 7.22 bbl | 303.2 gal |
| Maya Heavy | 21.8° API | 0.9230 | 6.81 bbl | 286.1 gal |
| Western Canadian Select (WCS) | 20.5° API | 0.9310 | 6.75 bbl | 283.6 gal |
The 42-Gallon Oil Barrel (bbl) and API Gravity Metrology
Why 42 Gallons in a Barrel?
In 1866, Pennsylvania oil producers standardized on 42-gallon wooden barrels. At ~7.2 lbs per gallon for light crude, a 42-gallon barrel weighs approximately 300 to 320 pounds—the maximum mass a pair of workers could roll and haul onto railcars. In 1872, the Petroleum Producers Association formalized the 42 US gallon barrel (bbl), which became the international commodity standard.
API Gravity Scale Formula
The American Petroleum Institute defines crude density relative to water at 60°F (15.6°C):
Specific gravity = 141.5 ÷ (API + 131.5). Water is 10° API.
Barrels (bbl) = Mass (kg) ÷ (Density [kg/L] × 158.9873) Related Petroleum & Mass Calculators
Frequently Asked Questions
How do you convert kilograms (kg) to barrels of crude oil (bbl)?
To convert kilograms to barrels of oil, divide the mass in kilograms by the product of density (kg/L) and 158.9873 (the number of liters in 1 standard 42-gallon barrel): Barrels (bbl) = Mass (kg) ÷ (Density in kg/L × 158.9873)
For light Brent crude oil (~0.835 kg/L), 1,000 kg (1 metric ton) equals approximately 7.53 barrels (bbl).
How many barrels of crude oil is 1 metric ton (1,000 kg)?
Depending on API gravity and density, 1 metric ton of crude oil yields between 6.7 and 7.6 barrels:
• WTI Light Sweet (39.6° API): ~7.60 barrels
• Brent Blend (38.3° API): ~7.53 barrels
• Arab Light (33.4° API): ~7.33 barrels
• Western Canadian Select Heavy (20.5° API): ~6.75 barrels
Why is a barrel of oil defined as exactly 42 US gallons?
In 1866, early Pennsylvania petroleum producers standardized the 42-gallon tierce (a container originally established under King Edward IV in 1482 for herring and wine) because a 42-gallon wooden barrel weighed approximately 300 to 320 pounds, which one or two men could maneuver without mechanical winches. In 1872, the Petroleum Producers Association formally ratified the 42-gallon standard barrel (bbl).
How does API gravity relate to crude oil density?
The American Petroleum Institute (API) gravity is an inverse scale: higher API numbers represent lighter, lower-density crudes, while lower numbers represent heavier crudes: API Gravity = (141.5 ÷ Specific Gravity @ 60°F) - 131.5
Light crudes (>31.1° API) command pricing premiums because they produce higher yields of gasoline, jet fuel, and diesel with less refinery processing.
What standard governs petroleum volume correction factors?
International custody-transfer measurement of petroleum liquids is governed by ASTM D1250 / API MPMS Chapter 11 (Petroleum Measurement Tables), which adjusts volume to the standard reference temperature of 60°F (15°C).