Three browser-side calculators for oil & gas — no data leaves your device. Convert crude volumes by API gravity, estimate refining margins, and translate between energy-content units.
Barrels ↔ gallons, litres, cubic metres & tonnes — mass depends on API gravity.
Formula: SG = 141.5 / (°API + 131.5); 1 bbl = 42 US gal = 158.987 L; tonnes = litres × SG × 0.999 ÷ 1000. WTI ≈ 39.6°API, Brent ≈ 38°API, Dubai ≈ 31°API.
Gross refining margin from crude & product prices.
Formula: 3:2:1 crack = [(2 × gasoline + 1 × distillate) × 42 − 3 × crude] ÷ 3, in $/bbl. Products are quoted $/gallon and multiplied by 42 to reach $/barrel. This is a gross margin — it excludes operating, energy and capital costs.
Heating value across fuels & energy units (barrel of oil equivalent).
Reference: 1 bbl crude ≈ 5.8 MMBtu; 1 MMBtu = 1.055 GJ = 0.293 MWh = 10 therms = 1 Mcf gas (≈1.036). Approximate EIA heating-value conversions — actual energy content varies by crude grade and fuel spec.
These calculators use standard EIA/industry conversion factors and are for estimation only. For live prices to plug in, see crude & product prices, retail gasoline and diesel.