Superheat Calculator
Suction superheat from measured line temperature and saturation temperature off the gauge.
Superheat proves the compressor drinks only vapour. Fixed-orifice systems charge to a target superheat that varies with indoor/outdoor conditions — use the maker's chart.
Formula
Superheat Calculator is a free superheat calculator for HVAC designers, technicians and energy auditors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Superheat Calculator
Suction superheat from measured line temperature and saturation temperature off the gauge. The calculation implements SH = T_suction_line − T_saturation(P_suction) (ACCA/ESCO refrigerant charging fundamentals). Superheat proves the compressor drinks only vapour. Fixed-orifice systems charge to a target superheat that varies with indoor/outdoor conditions — use the maker's chart.
How to use Superheat Calculator
- 1Enter Suction line temperature (clamp probe) in °C.
- 2Enter Saturation temp (from gauge dial) in °C.
- 3Read Superheat instantly — no submit button needed.
Why use Superheat Calculator?
- ✓Implements the standard formula — SH = T_suction_line − T_saturation(P_suction)
- ✓Reference cited on-page: ACCA/ESCO refrigerant charging fundamentals
- ✓Built-in engineering verdict flags out-of-range results instantly
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Superheat Calculator use?+
It computes SH = T_suction_line − T_saturation(P_suction), per ACCA/ESCO refrigerant charging fundamentals. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Superheat proves the compressor drinks only vapour. Fixed-orifice systems charge to a target superheat that varies with indoor/outdoor conditions — use the maker's chart.
Is this based on ASHRAE methods?+
The calculations follow the standard ASHRAE/ISHRAE formulations cited under the result, simplified where industry practice does the same. For permit-grade design, confirm with the full code procedure.
Is the Superheat Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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