Gas Volume Calc vs Cementing Engineer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Gas Volume Calc
This utility estimates natural gas flow rate using standard orifice meter calculations. It's designed for field use by operators, technicians, and engineers, combining meter geometry, flowing conditions, and gas composition for quick, reliable estimates.
- Estimates natural gas flow rate (MCFD)
- Uses standard orifice meter calculations
- Combines meter geometry, flowing conditions, and gas composition
- Provides reliable flow estimates in seconds
- Simple and dependable field workflow
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Orifice Calc is a field-ready utility for estimating natural gas flow rate (MCFD) using standard orifice meter calculations. Designed for operators, technicians, and engineers, the app combines meter geometry, flowing conditions, and gas composition inputs to produce reliable flow estimates in seconds. Whether you are troubleshooting production, verifying measurements, or performing quick field calculations, Orifice Calc provides a simple and dependable workflow.
Cementing Engineer
This app is a field calculator for oilfield cementing operations. It allows users to input wellbore geometry and slurry details to get live, updated calculations for volumes, pressures, and pump schedules. The app also features a live well schematic and a tally book for saving and recalling job details.
- Field calculator for oilfield cementing
- Live, updating calculations for volumes and pressures
- Wellbore geometry and slurry stack input
- Derived results with detailed math
- Live well schematic
- Tally Book for saving and recalling jobs
- Offline functionality
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Cementing Engineer is a field calculator for oilfield cementing operations, built by a cementer for cementers. The app requires an auto-renewable in-app subscription after the 7-day free trial to access the calculator, Tally Book, saved jobs, schematics, and derived cementing results. Pick the job - conductor, surface, intermediate, production, two-stage, drilling or production liner, balanced plug, kick-off plug, plug & abandon, or Bradenhead squeeze - enter the wellbore geometry and slurry stack, and every number updates live as you type. DERIVED RESULTS, SHOWN WITH THE MATH - Annular, shoe track, and displacement volumes with the capacity factors behind each number - Fluid placement tops and returns at surface - Volume calculations by slurry with sacks and totals - Pump schedule with rates and durations - Thickening time requirements - Hydrostatic, differential, lift, and bump pressures with burst limits - Mix water and total water requirements LIVE WELL SCHEMATIC A measured-depth schematic of casing, open hole, and fluid placement that redraws as the design changes, including two-stage and liner jobs. TALLY BOOK Save any job to the Tally Book: a browsable log of every well with its full design, well information, schematic, and complete derived results. Reopen any saved job straight into the calculator. WORKS IN THE FIELD Calculations run on the device, so the math works with no signal at the wellsite. Sign in with Apple or Google to keep your Tally Book synced across your devices. SUBSCRIPTION REQUIRED AFTER TRIAL Start with a 7-day free trial. After the trial, Apple automatically bills the selected plan unless canceled before renewal: $9.99/month or $79.99/year. Cancel anytime in your App Store account settings. Terms of Use: https://cement-phone-calculator.pages.dev/terms Privacy Policy: https://cement-phone-calculator.pages.dev/privacy Field estimate only - verify final volumes, pressures, and regulatory requirements before pumping.
Screenshots
Verdict
The clearest difference is in-app purchases: Gas Volume Calc at none against Cementing Engineer's 2. Cementing Engineer's advantage is update cadence (fortnightly vs every 61 months) and rating (5.0 vs 4.7). On price, ratings volume, ads and device support 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
Both are free to download. Cementing Engineer sells 2 in-app purchases, starting at $9.99 per month. Gas Volume Calc asks for nothing beyond the download.
Cementing Engineer holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 3 and 4 respectively.
Gas Volume Calc ships an update every 61 months, Cementing Engineer fortnightly. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.
| Parameter | Gas Volume Calc | Cementing Engineer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (3 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 3 | 4 — better |
| Update frequency | Every 61 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Subscription |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 26.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 18 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Kelly Gayneaux | Rondo Wright |
Customer experience
Gas Volume Calc
Cementing Engineer
In-app purchases
Gas Volume Calc
No in-app purchases
Cementing Engineer
- Pro Monthly7 Days trial$9.991 Month
- Pro Annual7 Days trial$79.991 Year









