We at Haverly Systems sadly announce that our cherished colleague Shari Whelan passed away on 28th July 2025, after a brief illness. Her good humor and programming skills steered us through the development and launch of the GRTMPS user interfaces for nearly 30 years, from version 3 in Windows 95 to H/PLANET in the Cloud. The team stepped up to share out her responsibilities when she went on medical leave in June and will be following on with her well established procedures for ensuring that the next releases come out in good working order. 

Shari's obituary and tribute page can be found here: https://www.reardonfh.com/obituary/Shari-Whelan

Haverly's precision petroleum‑property calculator 

📥 Download now:

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PETROCALC – THE TRUSTED PETROLEUM CALCULATOR IN YOUR POCKET

Precision petroleum‑property calculator—convert units, blend crude oils, and predict viscosity & distillation values offline in the field, lab, or classroom.

PetroCalc is the all‑in‑one oil & gas calculator that engineers, technicians, and students 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‑ups—completely offline.

KEY FEATURES

• Unit Conversion – Instantly switch between energy units (MJ/m³, MBTU/bbl, BTU/gal, kCal), temperature (°F/°C), pressure (psi/bar), oil‑density & gravity (kg/m³, API °, specific gravity), kinematic ↔ dynamic viscosity (cSt ↔ cP) and operational scales (SUS, SFS, Redwood I, Engler °), plus calorific‑value conversions and more with our intuitive oil & gas calculator interface.
• Distillation‑Curve Tools – Convert temperatures between TBP, ASTM D86, D1160, and D2887 scales and perform yield‑temperature interpolation for full distillation‑curve analysis.
• Blending Tools – Execute precise crude‑oil blending and petroleum blending for RVP, Flash Point, Smoke Point, Pour / Cloud / Freeze Point, API Gravity, Aniline Point, Mercaptan Sulfur, Nitrogen, and custom fractions.
• Fuel Property Indices – Compute Cetane Index (ASTM D4737 A/B, D976), Driveability Index, Refractive Index, and additional viscosity calculations.
• Heating Values – Obtain Gross & Net HHV in MJ/m³, MBTU/bbl, BTU/gal, kCal/kg, and more.
• Boiling‑Point Utilities – IBP/EBP plus five average‑boiling‑point methods (Volume, Weight, Molal, Cubic, Mean).
• K‑Factor Calculations – UOP K, Watson K, VRC K, Whole‑Crude K at any temperature.
• Viscosity Prediction – Single‑point, two‑point (Twu), and API 11A4.2 models with built‑in viscosity‑blending conversions.

WHY PETROCALC?

• Developed by Haverly Systems, a leader in petroleum‑process modeling.
• Optimized for petroleum, chemical, and process engineers—and perfect for students in engineering courses who need a dependable petroleum calculator and oil calculator for coursework.
• Works fully offline—no data connection required on‑site.
• Simple, accurate, and fast: the only crude‑oil calculator and petroleum‑blending tool you’ll ever need.

Download PetroCalc today and tackle every oil & gas calculation—from distillation‑curve conversions and viscosity blending to heating values—with confidence.