# Haverly's PetroCalc — Oil & Gas Property Tools

> Offline petroleum property calculator for engineers, technicians, and students. (iPhone/iPad app by Haverly Systems, Inc..)

- Source: https://appshunter.io/ios/app/haverlys-petrocalc/id1125079839 (this page in markdown: same URL + `.md`)
- Developer: [Haverly Systems, Inc.](https://appshunter.io/developer/1125079838)
- Category: Utilities, Business
- Price: Free
- Rating: 4.67/5 from 3 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.2 · 54 MB
- Released: 2016-06-27
- Data updated: 2026-06-06
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/haverlys-petrocalc/id1125079839/reviews.md

## What is Haverly's PetroCalc?

PETROCALC – THE TRUSTED PETROLEUM CALCULATOR IN YOUR POCKET

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.

## Key features

- Unit conversion for energy, temperature, pressure, and viscosity
- Distillation curve analysis and interpolation
- Crude oil and petroleum blending calculations
- Fuel property index computation
- Heating value calculations
- Boiling point utilities
- K-factor calculations
- Viscosity prediction models

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/haverlys-petrocalc/id1125079839/reviews.md

### 5/5 — Great tool - user friendly and fit for purpose

*2017-05-20*

I would recommend this property calculator for those wanting to check crude assay data, and those wanting to blend petroleum products. It has all the calculations you need, and the screen layouts have been well thought through. I would like to be able to blend Reid Vapour Pressure in kPa (rather than having to use psi), however this is only a tiny minor inconvenience for what is a unique and useful tool, available for your phone! - Geoffrey Gill

## Frequently asked questions about Haverly's PetroCalc

### What is Haverly's PetroCalc used for?

Haverly's PetroCalc is an all-in-one calculator for oil and gas property tasks. It helps engineers, technicians, and students with calculations like viscosity blending, crude-oil blending, and heating-value look-ups.

### Does Haverly's PetroCalc work offline?

Yes, Haverly's PetroCalc works fully offline, meaning no data connection is required on-site for its use.

### What types of unit conversions does Haverly's PetroCalc offer?

Haverly's PetroCalc offers unit conversions for energy (MJ/m³, MBTU/bbl, BTU/gal, kCal), temperature (°F/°C), pressure (psi/bar), oil density & gravity (kg/m³, API °, specific gravity), and viscosity (cSt ↔ cP, SUS, SFS, Redwood I, Engler °).

### What blending tools are available in Haverly's PetroCalc?

The app provides 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.

### Is Haverly's PetroCalc suitable for students?

Yes, it is perfect for students in engineering courses who need a dependable petroleum calculator for their coursework.

### What is the rating of Haverly's PetroCalc?

Haverly's PetroCalc has a rating of 4.7 stars from 3 ratings.

### On which devices can Haverly's PetroCalc be used?

Haverly's PetroCalc is supported on iPhone, iPad, and iPod devices.

### How often is Haverly's PetroCalc updated?

The latest version, 2.1.1, was last updated on May 2, 2026. This indicates a history of updates, though the exact frequency is not specified.

## Version history (last 5 releases)

### 2.1.1 — 2026-05-02

Improved reference temperature unit handling for API-to-Density calculations.

### 2.0 — 2025-05-15

What’s New in PetroCalc 2.0

• Re‑engineered interface and new name—PetroCalc replaces the retired Property Calculator
• Expanded Unit Conversion hub (energy, temp, pressure, API °, cSt ↔ cP, SUS/SFS/Redwood/Engler, calorific values)
• All‑new Distillation‑Curve tools: TBP ↔ ASTM D86, D1160, D2887 + yield‑temperature interpolation
• Enhanced Blending suite for RVP, flash/smoke/pour/cloud/freeze points, API Gravity, sulfur, nitrogen & custom fractions
• Added fuel‑property indices (Cetane, Driveability, Refractive) and full HHV calculator
• New K‑factor and viscosity‑prediction models (UOP K, Watson K, VRC K, single‑/two‑point & API 11A4.2)
• Faster, fully offline calculations and numerous performance fixes

### 1.16 — 2021-03-31

- Blending margins and padding reduced

### 1.15 — 2021-02-03

- Accessibility text settings disabled
- blending page UI improvements

### 1.14 — 2021-01-29

- Blending Page improvements

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## More apps by Haverly Systems, Inc.

- [H/Comet Mobile](https://appshunter.io/ios/app/hcomet-mobile/id1138408392)

All apps by Haverly Systems, Inc.: https://appshunter.io/developer/1125079838

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-06.*