HYARC
CALCULATORS
Simplifying Hydrogen Conversions, Empowering Accuracy.

Hydrogen Conversions Calculator

You may use this calculator to do simple conversions between four popular phase points of hydrogen:

  1. liquid at boiling point (-252.87°C at 1 atm).
  2. gas at Normal Temperature and Pressure (NTP = 20°C at 1 atm).
  3. gas at standard conditions (15.6°C at 1 atm).
  4. gas at standard conditions (0°C at 1 atm).

For additional flexibility and a large range of conditions consider using the Equation of State calculator offered by NIST.

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Instructions

This calculator was derived from a table of specific points using the NIST Equation of State. Conversions for each point are documented in the Conversion Factors table.

 

This material was prepared as an account of work sponsored by an agency of the United States Government.
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The portal brings together and enhances the utility of a variety of tools and web-based content on the safety aspects of hydrogen and fuel cell technologies to help inform those tasked with designing, approving or using systems and facilities, as well as those responding to incidents.

Copyright © 2025 by H2Tools; H2 Tools is intended for public use. It was built, and is maintained, by the Pacific Northwest National Laboratory with funding from the DOE Office of Energy Efficiency and Renewable Energy's Hydrogen and Fuel Cell Technologies Office. All Rights Reserved
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