Built for hydraulic engineers, technicians, maintenance professionals, and engineering students, Hydraulic Engineer delivers over 1,000 powerful calculations and professional reference tools in one intuitive app. Whether you are sizing cylinders, calculating fluid power, analyzing pipe flow, or looking up reference data, this app has you covered.
13 Specialized Calculator Categories:
• Actuator Formulas (18): Cylinder force, stroke, speed, rod area, and motor calculations for both extend and retract operations
• Fluid Power (34): Pressure, flow, horsepower, torque, and system performance calculations
• Pump Laws (17): All affinity laws for speed, flow, pressure, and power relationships
• Vehicle Drive (30): Drive speed, tractive effort, gradeability, drawbar pull, and drivetrain calculations
• Hydraulic Tubing (3): Wall thickness, burst pressure, and working pressure for hydraulic lines
• Cylinder Calculations (8): Extend and retract speed, rod end area, cycle times in US and SI units
• Thermal Hydraulics (8): Heat generation, reservoir cooling, heat exchangers, energy to heat fluid, and HP to BTU/hr
• Oil Velocity & Pressure Loss (4): Oil velocity in pipe, pressure drop per foot, and total system pressure losses
• Pipe Flow (6): Reynolds number, Darcy-Weisbach head loss, laminar friction factor, and orifice flow rate
• Accumulator Sizing (5): Discharge volume, precharge pressure, adiabatic and isothermal gas volume calculations
• Reservoir Sizing (4): Open and closed circuit sizing, cylinder-based sizing, and oil weight from volume
• AC/DC Electrical (41): Ohm’s law, single and three-phase power, motor selection, resistance, and inductance
• Area Formulas (60): Complete geometric area calculations for every common shape
700+ Conversion Formulas across 16 Categories:
• Pressures, Horsepower, BTU, Flow Rates, Linear Measure, Square Measure, Cubic Measure, Liquid Measure, Weights, Watts, Power, HVAC, Metric, Sand-to-Volume, and Fraction conversions
• Hydraulic-specific conversions for flow rates, pressures, and system calculations
• Complete metric conversion suite with 460 unit conversions
8 Temperature Scales:
• Celsius, Fahrenheit, Kelvin, Rankine, Réaumur, Newton, Delisle, and Rømer
• 56 conversion formulas covering every combination
8 Professional Reference Tables:
• Pipe Schedule (Schedule 40 & 80) — NPS 1/8 through 4 inch
• ISO Viscosity Grades — VG 10 through 1500 with cSt, SUS, and SAE equivalents
• Recommended Flow Velocities — pressure, return, suction, and drain lines
• Hydraulic Hose Sizing — SAE dash sizes -4 through -32
• JIC Thread Sizes — standard thread specifications
• Pipe Roughness Values — absolute roughness for 12 common materials
• O-Ring Sizes (AS568) — 24 common sizes with ID, cross-section, and groove dimensions
• Wire Rope Working Load Limits — 6×19 classification
Professional Features:
• Save and share any calculation result
• Share reference tables with colleagues
• Favorite frequently used calculators for quick access
• Switch between US Customary and SI Metric units
• Dual-unit display shows both US and metric values simultaneously
• Calculation history
• Dark mode optimized interface
• Works offline — no internet connection required
Hydraulic Engineer is FREE to download with access to core calculators and conversions. Upgrade to Premium with a one-time lifetime purchase to unlock sharing, advanced calculator sections, and unlimited history — no subscriptions.
Every calculator provides detailed breakdowns showing you exactly how results are calculated. Input your values, get instant results, and understand the math behind every calculation. All results display in both US and SI metric units simultaneously.
Popular Calculators Include:
Access essential hydraulic engineering reference data right from your phone. No more searching through catalogs or switching between apps to find specifications.
8 Professional Reference Tables:
16 Conversion Categories:
8 Temperature Scales:
