A pressure rating
30 psi is about 206.843 kPa. This unit conversion retains the same gauge or absolute reference as the original reading.
Pressure Converter
Unit conversion keeps the same pressure reference. Negative values may describe gauge pressure; they are not valid absolute pressure. Torr here is exactly 1/760 standard atmosphere.
Converted value
Kilopascals (kPa)
Kilopascals (kPa)
Display rounding does not change the calculation. Scientific notation keeps very small values visible; extra digits do not add measurement accuracy.
| Unit | Equivalent |
|---|---|
| Pascals (Pa) | 206842.719 |
| Kilopascals (kPa) | 206.842719 |
| Megapascals (MPa) | 0.206842719 |
| Bar | 2.06842719 |
| Millibar / hectopascal (mbar / hPa) | 2068.42719 |
| Pounds-force per square inch (psi) | 30 |
| Pounds-force per square foot (psf) | 4320 |
| Standard atmospheres (atm) | 2.04137892 |
| Torr — 1/760 atm | 1551.44798 |
Gauge pressure and absolute pressure
Absolute pressure = gauge pressure + ambient pressure. Enter the actual ambient pressure when known; 101.325 kPa is a standard reference, not a local weather measurement.
301.325Absolute pressure (kPa absolute)
200Gauge pressure (kPa gauge)
29.0075475Gauge psi (psi gauge)
All entered measurements and calculations stay in this browser. No external API or uploaded dataset is used.
How to use the Pressure Converter
- 01
Enter a numeric value without a comma separator or unit suffix, then choose the source and destination units.
- 02
Read the main result and equivalent-unit table. Choose 3, 6, 9, or 12 significant digits for display; calculation constants are not rounded to match the display.
- 03
Use the gauge pressure and absolute pressure panel for the practical calculation. Restore its example independently from the converter.
- 04
Copy the conversion or task results, or download the displayed conversion table as a CSV. Clear removes the converter value.
Examples
Adding the ambient reference
200 kPa gauge plus an ambient pressure of 101.325 kPa gives 301.325 kPa absolute. The ambient field can be changed for the actual conditions.
Gauge and absolute are references
A gauge reading is relative to the surrounding ambient pressure. Absolute pressure is measured from vacuum. Changing psi into kPa does not add ambient pressure; use the separate reference panel to do that explicitly.
Defined pressure units
One bar is exactly 100,000 pascals and one standard atmosphere is exactly 101,325 pascals. A psi is one pound-force per square inch, derived using the international pound, inch, and standard gravity. A torr is exactly one 760th of a standard atmosphere; it is not implemented as a measured mercury-column height.
Precision and accepted input
Use a decimal point or scientific notation such as 1e3. Blank values, unit suffixes, separators, and nonfinite numbers are rejected. Input magnitudes above 1e100 or nonzero magnitudes below 1e-100 are outside the supported range. The table rounds only for presentation, so 12 displayed digits should not be interpreted as 12 digits of measurement accuracy. Binary floating-point calculations can differ from exact decimal arithmetic in the final digits.
What to know
- No fluid-column units with unspecified fluid density or temperature.
- Conversions do not establish equipment pressure ratings or pressure-vessel safety.
Common questions
Can pressure be negative?
Gauge pressure can be negative when it is below ambient. Ordinary absolute pressure cannot be negative. The reference panel rejects a negative absolute result.
Is torr the same as mmHg?
They are very close in ordinary use but their formal definitions differ. This tool offers the defined torr and does not label it as mmHg.