Free HVAC and refrigeration calculators

R32 PT Chart (R-32 Pressure Temperature)

Look up the R-32 saturation pressure for a temperature, or the temperature for a gauge reading, and print the full chart.

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This R32 PT chart lists the saturation pressure of R-32 at every temperature, with a lookup in both directions. The R-32 PT chart calculator is a free tool that shows the pressure and temperature of R-32 (difluoromethane) at saturation, so you can check a pt chart r32 reading without a printed table. Enter a temperature to get the pressure, or enter a gauge pressure to get the temperature. It runs in your browser, nothing is uploaded, and there is no sign-up.

R-32 is a single-component HFC rated A2L (mildly flammable). It is widely used in ductless mini splits and in newer air conditioners and heat pumps, so technicians and homeowners both need quick, accurate pressure-temperature values. The tool gives a direct result and also builds a full pressure-temperature table you can scan across a range of temperatures.

R32 pt chart example

How to use the R-32 PT chart calculator

  1. Open the Refrigerant drop-down and choose R-32.
  2. Open the Convert drop-down. Choose Temperature → pressure if you know the temperature, or Pressure → temperature if you have a gauge reading.
  3. If you chose temperature, type the Saturation temperature. If you chose pressure, pick a unit in Gauge or absolute pressure and type the value. Use psig, kPag or barg for a gauge reading, and psia, kPaa or bara for an absolute reading.
  4. Pick your Chart units: °F and psig, °C and bar (gauge), or °C and kPa (gauge). These units apply to the result and to the table.
  5. Read the result rows. The tool shows only the rows that match your chosen mode.
  6. Scroll down to the pressure–temperature table under the result to see nearby values.
  7. Open More options if you want a different Chart table step (Auto, every 1, 2, 5 or 10 degrees) or an Altitude above sea level. Leave the altitude blank at sea level.

The example buttons above the form load other refrigerants, so set the drop-down to R-32 before you start. Under the result, Copy result copies the result lines with a link, and Copy link saves every input in the page address so the same calculation reopens later. Print / save as PDF produces the inputs, results, steps and date. Reset restores the starting example.

How do you read a PT chart?

A PT chart lists the saturation pressure of a refrigerant at each temperature: the pressure at which it boils or condenses at that temperature. To read it, find the temperature, then read across to the pressure. For R-32, the chart gives 205.8 psig at 70 °F and 325.7 psig at 100 °F. To read the other way, find the pressure and read the matching temperature. For example, 150 psig corresponds to 51.55 °F.

The chart temperature is the real refrigerant temperature only where liquid and vapor are both present, such as in the evaporator or condenser. In a superheated suction line or a subcooled liquid line the pressure is still about the evaporator or condenser pressure, but the pipe temperature is not the chart temperature: the difference between the two is the superheat or the subcooling. Use the chart as a reference for those two conditions, not for every point in the system.

R-32 is a single component, so it has no temperature glide. Each pressure matches exactly one saturation temperature, which keeps the readings simple.

Is a PT chart in psig or psia?

A PT chart is normally in psig, which is gauge pressure: the reading relative to the surrounding atmosphere. Service gauges read this way, so the chart matches them directly. Absolute pressure, psia, is psig plus 14.696 psi at sea level. At 70 °F, 205.8 psig is about 220.5 psia.

Use psia when a formula needs absolute pressure, such as gas law calculations. Air pressure falls with altitude, so enter your altitude under More options if you are not at sea level. All three chart unit options for R-32 (°F and psig, °C and bar (gauge), and °C and kPa (gauge)) are gauge values. For example, 10 °C corresponds to 10.06 barg for R-32.

Sources

Data and methods used by this calculator (checked October 2026):

Worked examples

InputResult
R-32, 45 °F133 psig
R-32, 115 °F401.4 psig
R-32, 150 psig51.55 °F
R-32, 10 °C10.06 barg

Calculated by the tool above with these values.

Frequently asked questions

What is the pressure of R-32 at 70 °F (standing pressure)?

Standing pressure is the pressure of refrigerant at rest when the system has reached ambient temperature and liquid and vapor are both present. For R-32 at 70 °F, the chart value is 205.8 psig, or about 220.5 psia.

What should R-32 pressures be when running?

There is no single running pressure for R-32. It depends on the evaporator and condenser temperatures. Find the saturation temperature for each side, enter it in the tool to get the matching pressure, and compare the result with the equipment manufacturer’s charging instructions, which should take priority.

Does R-32 run at higher pressure than R-410A?

Yes. R-32 runs at slightly higher pressure than R-410A at the same temperature. Use the R-410A PT chart if you want to compare the two values directly.

Is R-32 flammable?

R-32 is rated A2L by ASHRAE, which means it is mildly flammable. Follow the equipment’s charge limits and the applicable safety standard when you work with it.

Can I use the results in quotes or service records?

Yes. Results, charts and printouts can be used freely in commercial work such as quotes, proposals, reports and service records, with no attribution needed. The results are for estimation, so verify critical designs against the applicable standard.