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PSI - KPa Converter

- By Dr. Minas E. Lemonis, PhD - Updated: April 14, 2019

Enter the pressure/stress in either of the next two fields and get it converted instantly!

Pounds per sq. inch [psi]:
Kilopascal [KPa]:
icon

See also
Newtons-Pounds force converter
Pounds-kilograms converter
Inches-cm converter
Mph-kmph converter
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All Unit Converters

Definitions

Pounds per square inch

The pounds per square inch [psi] is a unit of pressure and stress according to the Imperial and US customary systems of units. The unit is derived from the pound-force lb-f, a unit of force and the inch squared, which is a unit of area. The psi unit describes how many pounds (force) are applied on a unit area of square inch. The definition of psi depends on the definitions of the pound-force and the inch units.

Pound-force [lb-f] is defined as the force of gravity on the earth's surface upon a mass equal to one avoirdupois pound. Its equivalence to the respective metric unit, the Newton [N] is: 1 lb-f = 4.4482216152605 N. The above definition depends on the earth's gravity g, which varies from place to place, but is typically standardized as g ≈ 9.80665 m/s2≈ 32.174049 ft/s2.

Inch [in] is a unit of length for the Imperial and US customary system of units. It was historically conceived as the length of 3 barley-corns. Today, it is defined through the meter [m] SI unit as: 1 in = 0.0254 m (= 2.54 cm = 25.4 mm).

With the above definitions of lb-f and the inch, relative to their metric equivalents, the conversion rule from psi to KPa becomes:

\begin{split} 1 \,\mathrm{psi} &= \frac{1\,\mathrm{lb-f}}{1\mathrm{in^2}} \\ &= \frac{4.4482216152605 \,\mathrm{N}}{0.0254^2 \,\mathrm{m^2}} \\ &\approx 6894.757293 \,\mathrm{\frac{N}{m^2}} \\ &\approx 6894.757293 \,\mathrm{Pa} \\ &\approx 6.894757293 \,\mathrm{KPa} \\ \end{split}

The relationship between psi and other units of pressure and stress are shown in the following table:

UnitSymbol[psi]
KilopascalKPa0.1450377
Barbar14.50377
Standard atmosphereatm14.69595
TorrTorr0.01933678

Kilopascal

Kilopascal [KPa] is a unit of pressure and stress according to the SI system of units. It is a multiple of Pascal [Pa] (1 KPa = 1000 Pa), which is a derived unit, based on the Newton [N], a unit of force and the meter squared, which is a unit of area. The Pa unit describes how many Newtons (force) are applied on a unit area of square meters.

The relationship between KPa and other units of pressure and stress are shown in the following table:

UnitSymbol[kPa]
PascalPa0.001
MegapascalMPa1000
GigapascalGPa1 000 000
Pounds per sq. inchpsi6.89476
Barbar100
Standard atmosphereatm101.325
TorrTorr0.1333224

How to convert pounds per sq. inch to kilopascal (psi to KPa)

  • Multiply pressure/stress in psi with 6.89476
  • The result is the pressure/stress in KPa

For example 10psi is 10x6.89476 ≈ 68.95 KPa

How to convert kilopascal to pounds per sq. inch (KPa to psi)

  • Divide pressure/stress in KPa by 6.89476
  • The result is the pressure/stress in psi

For example 100 KPa is 100/6.89476 ≈ 14.50 lb

Conversion table from KPa to psi

In the following table some typical pressures in KPa are converted to psi:

[KPa][psi]
1
5
10
20
30
40
50
70
90
100
150
200
300
400
500
600
700
800
900
1000
2000
3000

Conversion table from psi to KPa

In the following table some typical pressures in psi are converted to KPa:

[psi][KPa]
0.25
0.5
0.75
1
2
3
4
5
6
7
8
9
10
12
15
20
25
30
35
40
45
50
60
70
80
90
100
150
200
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See also
Newtons-Pounds force converter
Pounds-kilograms converter
Inches-cm converter
Mph-kmph converter
All quick Converters
All Unit Converters