Comparison

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.

Head to head
About

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.

Highlights
  • Volume flow rate conversion
  • Mass flow rate conversion
  • Mole-based flow rate conversion
  • Physics and engineering utility
  • Fluid dynamics calculations
Features
Read full description

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.

About

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.

Highlights
  • 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
Features
Read full description

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.

Screenshots

Flow Rate Conversion4 screens
Haverly's PetroCalc4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
Flow Rate Conversion versus Haverly's PetroCalc: the parameters behind the verdict, then further details
ParameterFlow Rate ConversionHaverly's PetroCalc
Price$2.99Free — better
Rating3.0 (1 ratings)4.7 (3 ratings) — better
Positive reviews0.0% of reviews100.0% of reviews — better
Number of ratings13 — better
Update frequencyEvery 29 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS1312.2 — better
Further details — not scored
Size1 MB54 MB
Age rating4+4+
DeveloperNitrioHaverly Systems, Inc.

Customer experience

Flow Rate Conversion

All ratings1 ratings
Positive0.0%
Neutral100.0%
Negative0.0%
Written reviews2 reviews
Positive0.0%
Neutral50.0%
Negative50.0%

Haverly's PetroCalc

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Flow Rate Conversion

No in-app purchases

None

Haverly's PetroCalc

No in-app purchases

Questions

Is Flow Rate Conversion free?
Flow Rate Conversion costs $2.99, with no in-app purchases.
Is Haverly's PetroCalc free?
Haverly's PetroCalc is free to download, with no in-app purchases.
Which has better reviews, Flow Rate Conversion or Haverly's PetroCalc?
Haverly's PetroCalc is rated higher. Flow Rate Conversion averages 3.0 out of 5 from 1 ratings, while Haverly's PetroCalc averages 4.7 from 3 ratings.
Do Flow Rate Conversion or Haverly's PetroCalc have ads?
Neither Flow Rate Conversion nor Haverly's PetroCalc shows ads.
Which is updated more often, Flow Rate Conversion or Haverly's PetroCalc?
Flow Rate Conversion ships an update every 29 months, and Haverly's PetroCalc every 2 months. Most recently, Flow Rate Conversion was updated on September 13, 2026 and Haverly's PetroCalc on September 8, 2026.

Other comparisons