2025-05-13 00:00:00 PetroCalc – the trusted petroleum calculator in your pocket PetroCalc is the all‑in‑one oil & gas calculator that engineers, technicians and students can rely on for fast, accurate viscosity calculations, crude‑oil blending and every other petroleum‑property task. Whether you need an oil calculator for the field, a crude‑oil calculator for the lab or a classroom reference, PetroCalc streamlines every petroleum calculation—from viscosity blending to heating‑value look up—completely offline.