Convert bbl, gallons, liters, m³ and tons · mass from API gravity (API MPMS 11.5.3)
Density bases, barrels per ton and the API MPMS 11.5.3 intraconversion
A US oil barrel is exactly 42 US gallons, which is 158.987294928 liters or 0.158987 cubic meters. (A beer barrel is 31 gallons; the 42-gallon oil barrel is the petroleum standard.)
It depends on the API gravity. Barrels per metric ton = (1000 / D60) / 0.158987 where D60 = 141.5/(API+131.5) x 999.016 kg/m3. A 25 API crude is about 6.96 bbl/tonne, a 35 API crude about 7.41 and a 40 API crude about 7.63.
1 cubic meter = 6.28981 US barrels (1 / 0.158987). This is a pure volume conversion and does not depend on the oil.
Tons measure mass and barrels measure volume, so the link is density. Lighter oils (higher API) are less dense, so a ton occupies more barrels. There is no single barrels-to-tonnes factor for all crude.
No. This tool converts units of a standard 60 degF volume. If you have an observed volume at another temperature, first correct it to 60 degF with API MPMS 11.1 (see the VCF calculator), then convert.