Best Pump Sizing Software in 2026: 7 Tools Compared (Free & Paid)
Comparison of the best pump sizing software for engineers: HydroApp Pro, EPANET, Pipe Flow Expert, AFT Fathom, Bentley HAMMER, and more. Pricing, features, pros/cons.
The Problem with Pump Sizing Today
Most engineers still size pumps using one of three approaches:
- Excel spreadsheets — manual, error-prone, no standardization
- Enterprise software ($3,000-$10,000/year) — powerful but expensive
- Manufacturer tools — limited to one brand, biased recommendations
In 2026, there are better options. Here's an honest comparison of 7 pump sizing tools.
1. HydroApp Pro — Best Overall Value
Price: $99 one-time (permanent access) Platform: Web (any device) Best for: Consulting engineers, contractors, students
Strengths:
- Complete hydraulic calculations (TDH, friction losses, NPSH, operating point)
- Supports both Darcy-Weisbach (Swamee-Jain) and Hazen-Williams
- Multi-segment piping networks with mixed materials
- Pump curve interpolation with automatic operating point
- Cavitation analysis with traffic-light warnings
- Professional PDF reports
- Works on phone, tablet, and desktop
- One-time payment, no subscription
Limitations:
- No transient analysis (water hammer simulation)
- Not designed for very large networks (50+ nodes)
Verdict: Best bang-for-buck for 80% of pump sizing projects. At $99, it pays for itself in the first hour of saved calculation time.
2. EPANET — Best Free Option
Price: Free (open source, US EPA) Platform: Windows desktop Best for: Large water distribution networks, academic research
Strengths:
- Free and open source
- Handles networks of any size
- Water quality simulation
- Industry-standard academic tool
- Large community and documentation
Limitations:
- Outdated interface (designed in 2000s)
- Steep learning curve
- No NPSH analysis
- Basic pump curve handling
- No PDF reports
- Windows only
Verdict: Great for large network modeling, but not practical for day-to-day pump sizing.
3. Bentley HAMMER — Best Enterprise Option
Price: $3,000-$10,000/year Platform: Windows desktop Best for: Transient analysis, large utilities
Strengths:
- Full transient (water hammer) analysis
- Complete hydraulic modeling suite
- Integration with GIS and CAD
- Industry standard for utilities
- Technical support included
Limitations:
- Very expensive ($3,000-$10,000/year)
- Steep learning curve
- Overkill for most pump sizing jobs
- Windows only
Verdict: The gold standard for transient analysis, but massive overkill (and cost) for basic pump sizing.
4. Pipe Flow Expert — Best for Industrial Processes
Price: ~$700 one-time Platform: Windows desktop Best for: Industrial piping (oil, gas, chemicals)
Strengths:
- Supports non-water fluids (viscosity, density)
- Complex network modeling
- Good graphical interface
- Fluid database
Limitations:
- Expensive (~$700)
- Windows only
- Not focused on water/HVAC
- Steeper learning curve
5. AFT Fathom — Best for Complex Systems
Price: ~$3,500+/year Platform: Windows desktop Best for: Process engineering, complex industrial systems
Strengths:
- Advanced steady-state modeling
- Multiple fluid support
- Control valve sizing
- Heat transfer modeling
Limitations:
- Very expensive
- Requires training
- Overkill for simple pump sizing
6. OpenFlows (Bentley) — Free Tier Available
Price: Free (limited) or $3,000+/year Platform: Windows desktop
Free version is heavily limited (few nodes). Full version same price as HAMMER.
7. Excel Spreadsheets — Not Recommended
Price: Free (if you have Office) Platform: Any
Technically free, but:
- Error-prone (broken cell references, wrong formulas)
- No pump curve interpolation
- No NPSH analysis
- No standardized reports
- Takes 10x longer than dedicated tools
Comparison Table
| Software | Price | Web | TDH | NPSH | Pump Curves | PDF Reports | Water Hammer |
|---|---|---|---|---|---|---|---|
| HydroApp Pro | $99 once | Yes | Yes | Yes | Yes | Yes | No |
| EPANET | Free | No | Yes | No | Basic | No | No |
| Bentley HAMMER | $3K+/yr | No | Yes | Yes | Yes | Yes | Yes |
| Pipe Flow Expert | $700 | No | Yes | No | Yes | Yes | No |
| AFT Fathom | $3.5K+/yr | No | Yes | Yes | Yes | Yes | No |
| OpenFlows Free | Free | No | Limited | Limited | Limited | Limited | Limited |
| Excel | Free | No | Manual | Manual | No | Manual | No |
Recommendation by Use Case
- Consulting engineer doing pump sizing daily: HydroApp Pro ($99)
- Student learning hydraulics: HydroApp Pro ($99) or EPANET (free)
- Municipal utility with large networks: EPANET (free) + Bentley HAMMER (transients)
- Industrial process engineer: Pipe Flow Expert ($700) or AFT Fathom
- Quick one-off calculation: HydroApp Pro ($99)
Bottom Line
For the vast majority of pump sizing work — residential, commercial, and small industrial — HydroApp Pro at $99 one-time delivers everything you need at a fraction of enterprise pricing. Save your $3,000/year for tools you actually need enterprise features for.
Try HydroApp Pro — professional pump sizing in 2 minutes. $99 one-time, permanent access.
¿Cansado de calcular esto a mano?
HydroApp Pro automatiza todo el calculo hidraulico. TDH, perdidas por friccion, NPSH, punto de operacion y reportes PDF. En 2 minutos.
Probar HydroApp Pro — $99 USD