How do you convert kPa to PSI?

Multiply the pressure in kilopascals (kPa) by 0.14503773773 to get pounds per square inch (PSI). For example, 100 kPa equals 100 x 0.14503773773 = 14.504 PSI. The conversion factor comes from the definition of the pascal (1 Pa = 1 N/m2) and the definition of PSI (1 PSI = 6,894.757 Pa), giving exactly 1 kPa = 1000 / 6894.757 PSI.

What is 250 kPa in PSI?

250 kPa is equal to 36.26 PSI (250 x 0.14503773773 = 36.259). This is a common tyre pressure for many passenger vehicles. New Zealand tyre pressures are typically specified in kPa on the door placard, while older gauges and some imported tools may use PSI.

What is standard atmospheric pressure in kPa and PSI?

Standard atmospheric pressure is 101.325 kPa, which equals 14.696 PSI. This is the internationally defined standard atmosphere (1 atm). It is the average air pressure at sea level and is used as a baseline for many pressure measurements in engineering, weather, and science.

kPa to PSI Conversion Calculator

Convert kilopascals (kPa) to pounds per square inch (PSI) instantly using the exact conversion factor. Enter a pressure in either unit and the calculator updates the other in real time. Common tyre, weather, and engineering pressures are included as quick-select presets.

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Standard conversion Exact factor: 1 kPa = 0.14503773773 PSI. Derived from SI definitions of the pascal and pound-force.

1. Convert kPa to PSI

Pressure in kilopascals (kPa)

kPa

Common pressure presets (fills kPa field)

2. Or Convert PSI to kPa

Pressure in PSI

PSI

Decimal places in result

Conversion Results

kPa Input
100.000
kilopascals

PSI Result
14.504
pounds per square inch

In Pascals

100,000

Pa (1 kPa = 1,000 Pa)

In Bar

1.000

bar (1 bar = 100 kPa)

Formula: PSI = kPa × 0.14503773773 | kPa = PSI × 6.894757293

kPa to PSI Breakdown

Input pressure100 kPa

Conversion factor0.14503773773

Calculation100 × 0.14504

Result14.504 PSI

Worked Example

Typical car tyre pressure250 kPa

Conversion250 × 0.14504

Result36.259 PSI

Reverse check36.259 × 6.8948 = 250.0 kPa

Common Pressure Reference Values

Pressure	kPa	PSI	Bar
Vacuum (absolute zero)	0	0	0
Standard atmosphere	101.325	14.696	1.013
Car tyre typical (NZ door placard)	220 to 260	31.9 to 37.7	2.20 to 2.60
4WD tyre loaded	300 to 350	43.5 to 50.8	3.00 to 3.50
Road bicycle tyre	620 to 790	90 to 115	6.20 to 7.90
Mountain bike tyre	170 to 410	25 to 60	1.70 to 4.10
Scuba tank (full)	20,000	2,901	200
Fire hose operating pressure	700 to 1,400	102 to 203	7.0 to 14.0

How to Convert kPa to PSI

Kilopascals (kPa) and pounds per square inch (PSI) are both units of pressure. The pascal (Pa) is the SI unit defined as one newton per square metre (N/m2). A kilopascal is 1,000 pascals. PSI is an imperial unit defined as the pressure exerted by one pound-force over one square inch of area.

The exact conversion is:

PSI = kPa x 0.14503773773
kPa = PSI x 6.894757293

The factor 0.14503773773 comes from dividing 1,000 Pa (one kPa) by 6,894.757 Pa per PSI. The value 6,894.757 Pa per PSI is derived from the exact definitions of the pound-force (4.4482216152605 N) and the inch (0.0254 m exactly), giving 1 PSI = 4.4482216152605 / (0.0254)2 = 6,894.757... Pa.

Why kPa and PSI Are Both Used in New Zealand

New Zealand officially uses the metric system, so tyre pressures, blood pressure, and industrial gauges are typically labelled in kilopascals. However, older equipment, imported American tools, and some workshop gauges still use PSI. Tyre placard labels on the door jamb of NZ-sold vehicles show kPa, while imported American vehicles may show PSI only. Being able to convert between the two is useful for tyre inflation, pressure washers, SCUBA equipment, and engineering work.

Tyre Pressure: kPa vs PSI

Tyre pressure is one of the most common reasons to convert between kPa and PSI. In New Zealand, recommended tyre pressures are typically in the range of 200 to 280 kPa (29 to 41 PSI) for passenger cars, depending on the vehicle and load. You can find the recommended pressure on a sticker inside the driver's door jamb or in the owner's manual. Check your tyres when cold (not after driving) for the most accurate reading.

kPa	PSI	Typical use
200	29.0	Small car, light load
220	31.9	Small to mid-size car
240	34.8	Mid-size car
250	36.3	Standard passenger car
260	37.7	Larger car or SUV
280	40.6	Loaded vehicle or van
310	45.0	4WD loaded / off-road

Worked Example

Your car door placard says the recommended tyre pressure is 250 kPa. Your tyre gauge reads in PSI. What pressure should you inflate to?

PSI = 250 x 0.14503773773 = 36.259 PSI

Round to 36 PSI (or 36.3 PSI for a more precise gauge). This matches the default output of this calculator with 250 kPa entered.

Quick Conversion Table

kPa	PSI
10	1.450
50	7.252
100	14.504
150	21.756
200	29.007
250	36.259
300	43.511
400	58.015
500	72.519
1,000	145.038

Related Calculators

Sources and method: Conversion factor derived from NIST Special Publication 330 (SI definitions) and NIST Handbook 44 (inch and pound-force definitions). 1 PSI = 6,894.757293168361 Pa exactly, per the international definitions of the pound-force (4.4482216152605 N) and the inch (25.4 mm). Therefore 1 kPa = 1000 / 6894.757293168361 = 0.14503773773... PSI.

This calculator provides accurate unit conversion based on the internationally defined conversion factor. For critical engineering or safety applications, verify against your applicable standard or instrument calibration certificate.

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