API gravity, density & temperature correction
°API, specific gravity and density at 15 °C from a density observed at any temperature, with the volume correction factor that gets you there.
Units & conversion
Petroleum unit converter
Twenty-one families of upstream units, converted in one place — including the awkward ones like bbl/ft, psi/ft and millidarcy.
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How it is calculated
- Every unit is defined as a linear map onto the SI base of its quantity: base = value × factor + offset. The offset is non-zero only for temperature.
- Conversion runs value → base → target, so a bbl/ft to L/m conversion goes through m³/m and never through a hand-written pair factor.
- Standard gas volumes (scf, MSCF, Sm³) are converted geometrically. See the limitation.
Where this stops being true
scf and Sm³ are not the same standard condition: scf is defined at 60 °F and 14.696 psia, Sm³ at 15 °C and 101.325 kPa. This converter treats them as a pure volume ratio, which is about 0.3 % low against a properly referenced conversion. For custody transfer that difference is money — use the contract's own reference conditions, not this.
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