Free, offline-capable oil & gas converter and field calculator. Built as a static web app — no install, no signup, no backend.
- Unit converter — volume, pressure, temperature, length, mass, flow rate (bbl, gal, m³, psi, kPa, bar, atm, °F/°C/K/°R, ft/m, lb/kg, bbl/d, scf/d, Mscf/d, MMscf/d, …)
- Drilling — mud-weight conversion (ppg ↔ SG ↔ lb/ft³ ↔ kg/m³ ↔ psi/ft), hydrostatic pressure, pipe & annular capacity / volume, ECD
- Production / reservoir — API ↔ specific gravity, gas-oil ratio, Standing oil FVF (Bo), gas FVF (Bg)
- Gas — scf/Mscf/MMscf/Bcf/Sm³ conversion, Brill–Beggs Z-factor with Sutton pseudo-criticals, real-gas density, gas SG ↔ MW
- Settings — default unit system, significant figures, light/dark theme,
persisted in
localStorage
The app is plain HTML/CSS/ES modules. Modules require a real HTTP origin
(browsers block file:// ES module imports), so serve the folder:
python3 -m http.server 8000
# then open http://localhost:8000Open http://localhost:8000/tests/test.html — assertions run in the page
and a green/red summary is shown at the top.
In repo Settings → Pages, set the source to main branch / root. The site
is fully static and works as-is.
Field correlations (Standing Bo, Brill–Beggs Z, etc.) are approximations. For safety-critical work, verify against authoritative sources and your own measured data.
MIT — see LICENSE.