# Hydraulic Engineer — Calculations for Hydraulics > Comprehensive hydraulic engineering calculator with over 1,000 formulas and reference tables. (iPhone/iPad app by Historycentral.com.) - Source: https://appshunter.io/ios/app/hydraulic-engineer/id410465591 (this page in markdown: same URL + `.md`) - Developer: [Historycentral.com](https://appshunter.io/developer/1744330560) - Category: Productivity, Business - Price: $4.99 with in-app purchases - Rating: 4.00/5 from 1 App Store ratings · 8 written reviews indexed - Age rating: 4+ - Requires: iOS 18.6 · 19 MB - Languages: American English - Released: 2010-12-19 - Data updated: 2026-08-23 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/hydraulic-engineer/id410465591/reviews.md ## What is Hydraulic Engineer? HYDRAULIC ENGINEER is the most comprehensive hydraulic engineering calculator available on the App Store, featuring over 1,000 formulas across 13 specialized calculator categories, 8 temperature scale converters, and 8 professional reference tables. CALCULATOR CATEGORIES - Actuator Formulas — cylinder force, stroke, speed, and rod calculations - Fluid Power — pressure, flow, horsepower, and torque calculations - Pump Laws — affinity laws for speed, flow, pressure, and power - Vehicle Drive — drive speed, tractive effort, gradeability, and drawbar pull - Hydraulic Tubing — wall thickness, burst pressure, and working pressure - Cylinder Calculations — extend/retract speed, rod end area, and cycle times - Thermal Hydraulics — heat generation, reservoir cooling, heat exchangers, and energy to heat fluid - Oil Velocity & Pressure Loss — pipe velocity, pressure drop per foot, and total system losses - Pipe Flow — Reynolds number, Darcy-Weisbach head loss, laminar friction, and orifice flow - Accumulator Sizing — discharge volume, precharge pressure, adiabatic and isothermal gas volumes - Reservoir Sizing — open/closed circuit sizing, cylinder-based sizing, and oil weight calculations - AC/DC Electrical — Ohm's law, power, resistance, inductance, and motor selection - Area Formulas — 60 geometric area calculations for every common shape 700+ CONVERSION FORMULAS Pressure, horsepower, BTU, flow rates, linear measure, square measure, cubic measure, liquid measure, weights, watts, power, HVAC, metric, sand-to-volume, and fraction conversions. 8 TEMPERATURE SCALES Convert between Celsius, Fahrenheit, Kelvin, Rankine, Reaumur, Newton, Delisle, and Romer — 56 conversion formulas covering every combination. 8 PROFESSIONAL REFERENCE TABLES - Pipe Schedule (Schedule 40 & 80) - ISO Viscosity Grades - Recommended Flow Velocities - Hydraulic Hose Sizing (SAE) - JIC Thread Sizes - Pipe Roughness Values - O-Ring Sizes (AS568) - Wire Rope Working Load Limits KEY FEATURES - Save and share any calculation result - Share reference tables - Calculation history - Favorites for quick access to your most-used formulas - Switch between US Customary and SI Metric units - Dual-unit display shows both US and metric values simultaneously - Dark mode optimized interface - Works offline — no internet connection required PREMIUM UPGRADE Unlock sharing, advanced calculator sections, and unlimited history with a one-time lifetime purchase — no subscriptions. HYDRAULIC ENGINEER is designed for working hydraulic engineers, technicians, maintenance professionals, and engineering students. If there are formulas or reference tables you'd like to see added, just use the built-in feedback feature to let us know. ## Key features - Over 1,000 hydraulic formulas - 13 specialized calculator categories - Temperature scale converters - Professional reference tables - Save and share calculations - Works offline - US Customary and SI Metric units ## Pricing and in-app purchases Base price: $4.99. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Hydraulic Pro | $3.99 | one-time | ## Recent user reviews (8 of 8) All indexed reviews: https://appshunter.io/ios/app/hydraulic-engineer/id410465591/reviews.md ### 1/5 — Hydraulic *2013-02-20* This app contains individual formulas for very basic functions. Units are not clearly defined for each calculation. ### 1/5 — Meh *2012-08-30* Not worth the money in Australia. Everything has to be imperial, there are no settings for metric. ### 3/5 — OK so far *2012-08-15* Has some useful calculations, would be nice if there were some accumulator calculations. ### 4/5 — Excellent calculator (v1.5) *2012-02-08* I use nearly everyday. Pretty good variety of calculations available. This newer version is more user friendly than the earlier versions. Still not perfect but it's a big improvement. Big timesaver for me. ### 5/5 — Works good for me. *2011-10-13* Great for sending a quick calculation for a client. Pneumatic engineer in the future? ### 1/5 — Hyd eng *2011-08-03* Nothing more than a cumbersome calculator. ### 1/5 — Good idea. No metric support :( *2011-03-22* App would be great if it had unit selection. Not useful at all for half of the world... Please update it. Will re-rate if metric units are added, but for now, a total waste of money!!! ### 3/5 — Review *2011-01-27* Nice little program, but would be helpful to use metric units as well. ## Frequently asked questions about Hydraulic Engineer ### What hydraulic formulas are available in Hydraulic Engineer? Hydraulic Engineer features over 1,000 formulas across 13 specialized categories, including actuator, fluid power, pump laws, vehicle drive, hydraulic tubing, cylinder, thermal hydraulics, oil velocity & pressure loss, pipe flow, accumulator sizing, reservoir sizing, AC/DC electrical, and area formulas. ### Does Hydraulic Engineer work offline? Yes, Hydraulic Engineer is designed to work offline, meaning you do not require an internet connection to access its formulas, calculators, and reference tables. ### Can I switch between units in Hydraulic Engineer? Yes, Hydraulic Engineer allows you to switch between US Customary and SI Metric units. It also offers a dual-unit display that shows both US and metric values simultaneously for convenience. ### What kind of reference tables are included in Hydraulic Engineer? The app includes 8 professional reference tables: Pipe Schedule (Schedule 40 & 80), ISO Viscosity Grades, Recommended Flow Velocities, Hydraulic Hose Sizing (SAE), JIC Thread Sizes, Pipe Roughness Values, O-Ring Sizes (AS568), and Wire Rope Working Load Limits. ### How much does Hydraulic Engineer cost? Hydraulic Engineer is a paid application with a one-time lifetime purchase price of $4.99. There are no subscriptions required to access its features. ### What is the update frequency for Hydraulic Engineer? The app was last updated on March 22, 2026, with version 2.02. While specific update frequency isn't detailed, this indicates ongoing development and support. ### Is Hydraulic Engineer suitable for students? Yes, Hydraulic Engineer is designed for working hydraulic engineers, technicians, maintenance professionals, and engineering students. Its comprehensive formulas and reference tables make it a valuable learning tool. ### What is the user rating for Hydraulic Engineer? Hydraulic Engineer has a user rating of 4.0 stars based on 1 rating. This suggests a generally positive reception from its users. ## Version history (last 5 releases) ### 2.02 — 2026-03-22 Minor bug fixes ### 2.0.1 — 2026-03-16 Bug fixes ### 2.0 — 2026-03-12 Totally rewritten code, with hundreds of a additional formulas ### 1.6.5 — 2013-04-17 added metric formulas, minor bug fixes ### 1.6 — 2012-10-09 iPhone 5 compatible, iPad Retina Compatible, New hydraulic conversion formulas ## More apps by Historycentral.com - [Finance Formulator](https://appshunter.io/ios/app/finance-formulator/id294194640) - [Personal Formulator](https://appshunter.io/ios/app/personal-formulator/id296173495) - [Electrical Formulator](https://appshunter.io/ios/app/electrical-formulator/id299749412) - [Plumbing Formulator](https://appshunter.io/ios/app/plumbing-formulator/id303497783) - [Carpentry Formulator](https://appshunter.io/ios/app/carpentry-formulator/id305583131) - [Builder's Formulator](https://appshunter.io/ios/app/builders-formulator/id306247596) All apps by Historycentral.com: https://appshunter.io/developer/1744330560 --- *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 2026-08-23.*