Flow Rate Conversion vs Haverly's PetroCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Flow Rate Conversion
Easily convert between various units of flow rate, including volume-based, mass-based, and mole-based measurements. Essential for physics and engineering applications involving fluid dynamics and hydrometry.
- Volume flow rate conversion
- Mass flow rate conversion
- Mole-based flow rate conversion
- Physics and engineering utility
- Fluid dynamics calculations
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Flow Rate Conversion - Easily convert between various units of flow rate, whether it's volume-based, mass-based, or mole-based. In the realms of physics and engineering, especially in the domains of fluid dynamics and hydrometry, volumetric flow rate (also referred to as volume flow rate, fluid flow rate, or volume velocity) signifies the volume of fluid that traverses a given point per unit of time. It's typically denoted by the symbol Q, with the SI unit being m³/s (cubic meters per second). Another unit occasionally used is sccm (standard cubic centimeters per minute). In physics and engineering, mass flow rate represents the mass of a substance passing through a point per unit of time. It's measured in kilograms per second in SI units and in slug per second or pound per second in US customary units. The common symbol is ṁ (pronounced "m-dot"), although sometimes μ (Greek lowercase mu) is employed. Occasionally, mass flow rate is referred to as mass flux or mass current, as seen, for instance, in Fluid Mechanics, Schaum's, and other references. In this article, we adopt the more intuitive definition. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.
Haverly's PetroCalc
This application provides engineers, technicians, and students with a comprehensive set of tools for petroleum property calculations. It offers features for unit conversion, crude oil blending, viscosity prediction, and distillation curve analysis, all accessible offline.
- 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
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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.
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Verdict
The clearest difference is review sentiment: Haverly's PetroCalc at 100% against Flow Rate Conversion's 0%. Haverly's PetroCalc also leads on price (Free vs $2.99) and rating (4.7 vs 3.0). On ads, in-app purchases, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Haverly's PetroCalc is free to download; Flow Rate Conversion costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Haverly's PetroCalc holds the better App Store score, 4.7 against 3.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews point the same way: 0% of Flow Rate Conversion's written reviews are positive against 100% of Haverly's PetroCalc's.
Flow Rate Conversion ships an update every 29 months, Haverly's PetroCalc every 2 months. The most recent releases landed on September 13, 2026 and September 8, 2026 respectively.
| Parameter | Flow Rate Conversion | Haverly's PetroCalc |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 3.0 (1 ratings) | 4.7 (3 ratings) — better |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 29 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13 | 12.2 — better |
| Further details — not scored | ||
| Size | 1 MB | 54 MB |
| Age rating | 4+ | 4+ |
| Developer | Nitrio | Haverly Systems, Inc. |
Customer experience
Flow Rate Conversion
Haverly's PetroCalc
In-app purchases
Flow Rate Conversion
No in-app purchases
Haverly's PetroCalc
No in-app purchases
Questions
Is Flow Rate Conversion free?
Is Haverly's PetroCalc free?
Which has better reviews, Flow Rate Conversion or Haverly's PetroCalc?
Do Flow Rate Conversion or Haverly's PetroCalc have ads?
Which is updated more often, Flow Rate Conversion or Haverly's PetroCalc?
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