FieldCalc is a free reference tool published by Raire LLC (Raire Labs). Last updated October 9, 2026.
Short version. FieldCalc does saturation-temperature math from published pressure-temperature tables.
It does not diagnose equipment and it does not tell you how to charge a system.
The equipment manufacturer's data, your instruments, and your training always come first.
Terms of use
Reference only. Results are calculated from published tables and are provided for convenience. They are not an equipment target, a diagnosis, or a charging instruction.
Verify everything. Check every reading and result against the manufacturer's data and your own calibrated instruments before acting. Using this tool does not replace proper gauges, thermometers, EPA Section 608 certification, or professional judgment.
Safety. A2L refrigerants (such as R-454B and R-32) are mildly flammable. Follow all applicable safety procedures, codes, and regulations.
No warranty. The tool is provided "as is" and "as available," without warranties of any kind. Tables are interpolated linearly between published points and may differ slightly from a given manufacturer's chart.
Limitation of liability. To the fullest extent permitted by law, Raire LLC is not liable for any loss, damage, or injury arising from use of, or reliance on, this tool.
Found a discrepancy? If a result differs from a manufacturer chart, please tell us at kevincody@rairelabs.io. We take PT data accuracy seriously.
Privacy
Your readings stay on your device. The calculator runs entirely in your browser. Pressures, temperatures, and results are never sent to us or stored.
Saved preferences. Your refrigerant and unit choices are remembered in your browser's local storage so you don't have to reselect them. Nothing else is saved, and it never leaves your device.
Offline use. FieldCalc saves a copy of itself in your browser so it works without a signal. You can clear it any time in your browser's site settings.
Waitlist email. If you join the FieldCalc Pro waitlist, we store your email address, and only that, to tell you when Pro launches. We don't sell it or share it for marketing. To be removed, email kevincody@rairelabs.io and we'll delete it.
Analytics. FieldCalc may use cookie-free, aggregate analytics (such as page views, country, and device type) to understand how many people use the tool. It does not track you across sites or build individual profiles.
Hosting. The site is hosted on Cloudflare, which may process standard technical data such as IP addresses to deliver the site and protect it from abuse.