kPa to psi Converter: kilopascal to psi, Both Directions
Free live kpa to psi conversion calculator: convert kilopascal to psi and psi to kPa in real time, plus bar, mmHg, atm, and Pa. Exact factor 1 psi = 6.894757293168 kPa, adjustable precision, and a quick kpa to psi chart.
kPa to psi calculator
Tip: pick psi as From and kPa as To to convert psi to kPa, or use Swap to reverse any conversion.
kPa to psi chart (quick table)
Reference kpa to psi table, 2 decimals, computed from the exact factor.
| kPa | psi |
|---|---|
| 100 | 14.50 |
| 150 | 21.76 |
| 200 | 29.01 |
| 220 | 31.91 |
| 230 | 33.36 |
| 240 | 34.81 |
| 250 | 36.26 |
| 260 | 37.71 |
| 270 | 39.16 |
| 280 | 40.61 |
| 300 | 43.51 |
| 350 | 50.76 |
| 400 | 58.02 |
| 500 | 72.52 |
| 600 | 87.02 |
| 700 | 101.53 |
| 800 | 116.03 |
| 1000 | 145.04 |
Where kPa to psi matters
Worked examples
- Tire placard, kPa to psi: your placard reads 230 kPa. psi = 230 / 6.894757293168 = 33.3587 psi, so set the gauge to about 33.4 psi.
- Compressor, psi to kPa: the cut-out is set to 125 psi. kPa = 125 x 6.894757293168 = 861.8447 kPa, about 8.62 bar.
- Multi-unit, bar to psi: a gauge reads 8 bar. First to kPa: 8 x 100 = 800 kPa. Then to psi: 800 / 6.894757293168 = 116.0302 psi. The converter does this pivot through kPa automatically for any unit pair.
Method and derivation
This tool converts by the exact definition chain, not by a rounded table lookup:
1 lbf = 4.4482216152605 N (exact)
1 in = 0.0254 m (exact, 1959)
1 psi = 1 lbf / 1 in^2
= 4.4482216152605 / 0.0254^2 Pa
= 6894.757293168 Pa
= 6.894757293168 kPa (exact)
pivot = kPa (all units convert through kPa)
1 bar = 100 kPa (exact)
1 atm = 101.325 kPa (exact)
1 mmHg = 0.133322387415 kPa (exact)
1 Pa = 0.001 kPa (exact)
kPa -> psi : psi = kPa / 6.894757293168
psi -> kPa : kPa = psi * 6.894757293168
any pair : out = in * KPA_PER[from] / KPA_PER[to]Related pressure units (per 1 psi)
| Unit | Value |
|---|---|
| kPa | 6.89476 |
| bar | 0.0689476 |
| atm | 0.0680460 |
| mmHg | 51.7149 |
| Pa | 6894.7573 |
Scope and boundaries
This tool converts kilopascals (kPa). It is not a general pressure-unit converter for every unit ever defined.
vs kgf/cm2 (tool #912): kgf/cm2 is a different unit, 1 kgf/cm2 = 98.0665 kPa = 14.2233 psi. If your gauge is marked kg/cm2, use the kgf/cm2 to psi converter, not this page.
vs bar (tool #840): 1 bar = 100 kPa exactly, so bar conversions go through the same definition; this tool also converts bar directly.
vs mmHg (tool #921): mmHg is included here, but for deep mmHg work see the dedicated kPa to mmHg converter.
Frequently asked questions
What is the formula to convert kPa to psi?
Divide kilopascals by 6.894757293168 to get psi: psi = kPa / 6.894757293168. To go the other way, multiply: kPa = psi x 6.894757293168. For example, 100 kPa / 6.894757293168 = 14.5038 psi. The number 6.894757293168 is exact, from the definitions of the pound-force and the inch.
How many psi is 100 kPa?
100 kPa equals 14.5038 psi (14.50377377302168162138 psi at full precision). It is the most-searched conversion in this cluster because 100 kPa is a round reference point near standard tire and shop-air pressures.
What is 200 kPa in psi?
200 kPa equals 29.0075 psi (29.00754754604336324276 psi). Car tire placards in many markets list pressures around 200-250 kPa, so this sits right in the common tire-pressure band.
What is 250 kPa in psi?
250 kPa equals 36.2594 psi (36.25943443255420405345 psi). Many compact cars and sedans specify about 240-250 kPa, which is why 250 kPa is one of the most searched tire-pressure conversions.
What is 300 kPa in psi?
300 kPa equals 43.5113 psi (43.51132131906504486414 psi). That is a high pressure for passenger-car tires but is common for spare tires, trailer tires, and some load-range tires.
How many kPa is 35 psi?
35 psi equals 241.3166 kPa (241.316505260880 kPa exactly). Many SUVs and pickup trucks specify 35 psi, so this reverse conversion is searched almost as often as the kPa-to-psi direction.
Is psi or kPa the larger unit?
One psi is the larger unit: 1 psi = 6.894757293168 kPa, so the same pressure is written with a smaller number in psi. That is why tire placards show 220 kPa while gauges show 32 psi for the same tire.
My car tire placard says 220 kPa. What is that in psi?
220 kPa equals 31.9083 psi (31.90830230064769956704 psi), which gauges read as 32 psi. Most placards print both: 220 kPa / 32 psi. If yours shows only kPa, convert first, then set the gauge to the psi value.
Why do car placards show kPa but tire gauges read psi?
It is a regional convention split: kPa is the SI pressure unit used on placards and in manuals almost everywhere, while US-market gauges and pumps read psi. The pressure is identical; only the unit differs. Convert kPa to psi with this tool, then inflate to the converted number.
What is 1 bar in psi and kPa?
1 bar is exactly 100 kPa, which converts to 14.5038 psi (14.50377377302168162138 psi). Note that 1 bar is not the same as 1 kgf/cm2 (which is 98.0665 kPa, or 14.2233 psi); gauges marked bar and gauges marked kg/cm2 differ by about 2 percent.
What is standard atmospheric pressure in psi?
Standard atmospheric pressure is 101.325 kPa exactly, which equals 14.6960 psi (14.69594877551421890286 psi). That is the zero reference for absolute pressure: 0 psig equals 14.696 psia at sea level.
How many psi is 1 mmHg?
1 mmHg equals 0.0193368 psi (0.01933677745946312912 psi). As a reference, a blood-pressure reading of 120 mmHg is about 2.3204 psi.
Does gauge versus absolute pressure (psig vs psia) change the conversion?
No. Converting between kPa and psi never adds or subtracts atmospheric pressure; 200 kPa converts to 29.0075 psi as-is. Whether to add 14.696 psi depends on gauge versus absolute reference (psig vs psia), which is about the measurement reference, not the unit conversion. Most tire and workshop gauges read gauge pressure, so compare like with like.
What is the difference between kPa and kg/cm2?
They are different pressure units: 1 kgf/cm2 equals 98.0665 kPa, about 2 percent less than 1 bar. This tool converts kilopascals (kPa) to psi. If your gauge is marked kg/cm2 (kilogram-force per square centimetre), use our kgf/cm2 to psi converter instead: 1 kgf/cm2 = 14.2233 psi.
Is there a quick mental trick for kPa to psi?
Divide kPa by 7 as a mental estimate: 200 kPa / 7 is about 28.6 psi versus the exact 29.0075 psi, an error of about 1.5 percent. It is fine for a sanity check but too coarse for setting tire or equipment pressures; use the exact factor 6.894757293168 for real work.
How precise is this converter?
The converter uses the exact definition 1 psi = 6.894757293168 kPa and lets you choose 0 to 10 decimal places. Every number on this page, including the table and FAQs, was computed from that definition with 50-digit decimal arithmetic and cross-checked against an independent test suite.
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