Calculate Your H2 System Efficiency: NIST Accuracy and Professional Reports in 10 seconds.
Hydrogen Mass and Density Calculation: Scientific Accuracy with H2-Optimizer Pro
Designing a hydrogen system requires reliable data. However, calculating hydrogen density at high pressures (such as 350 bar or 700 bar) is not straightforward: ideal gas laws are not enough, and calculation errors can undermine cost estimates and tank sizing.

To meet this challenge, Costruzioni Energetiche developed H2-Optimizer Pro, the software designed for energy transition professionals.
H2-Optimizer Pro
Optimize storage and analyze operating costs.
The software is a complete ecosystem that enables you to turn physical data into business decisions. Thanks to integration with the scientific database NIST/CoolProp, the tool offers:
- Density and Real Mass Calculation: Get accurate data based on pressure (bar) and temperature (°C), removing the approximations typical of generic calculators.
- Economic Analysis (Partial LCOH): Instantly calculate the energy cost required for production, based on electrolyzer efficiency and the kWh cost.
- Recharge Time Estimation: Determine the time needed to fill the tanks based on your system flow rate.
- Professional Bilingual Reporting: Generate a technical PDF in Italian and English, ready to be attached to technical reports or commercial offers.

H2 Global Advisor AI
Technical-Economic Feasibility Report
We don’t just calculate hydrogen density.
With the new H2 Global Advisor AI module, we’ve integrated the power of GPT-4o to turn raw data into a true Techno-Economic Feasibility Report.
By simply entering the location and energy parameters, the artificial intelligence instantly generates:
- Needs Analysis: Automatic calculation of the required H2 production.
- Energy Balance: Verification of coverage through renewable sources.
- Safety Standards: Identification of applicable ISO and ATEX regulations.
- Bilingual Report: Documentation ready to be presented to partners or investors.
It’s the ultimate tool for those who must make fast, accurate decisions in the energy transition sector.

Why choose a professional tool?
Today accuracy is a competitive asset. H2-Optimizer Pro is not a simple script, but a tool tuned to ISO 14687 and NIST standards. Using certified data means ensuring the end customer safety, efficiency, and a realistic estimate of investment payback time (ROI).
How to access the Software
We decided to make this tool available to our partners and to professionals seeking technical excellence. At the bottom of this page, you can request your access credentials to start using the full suite.
Want to optimize your hydrogen calculations?
Use the button below to write to us and receive the password for the H2-Optimizer Pro portal.



