Convert psi to Newtons per Square Millimetre (psi to N/mm2)
1 psi = 0.006894757293 newtons per square millimetre (N/mm²). 1 N/mm² = 145.0377377 psi. Example: 15 psi = 15 × 0.006894757293 = 0.1034213594 N/mm².
Also searched as psi to N/mm2, psi in N/mm2, psi into newtons per square millimetre, psi in newtons per square millimetre, psi into newton per square millimetre, psi to newton per square millimetre, psi to newtons per square millimetre converter, psi to newtons per square millimeter and how many newtons per square millimetre in a psi.
1 psi = 0.006894757293 N/mm²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk psi to newton per square millimetre converter to paste a column from Excel.
How to Convert psi to Newton per Square Millimetre
- 1 psi = 0.006894757293 N/mm²
- 1 N/mm² = 145.0377377 psi
- Example: convert 15 psi to N/mm²: 15 psi = 15 × 0.006894757293 N/mm² = 0.1034213594 N/mm²
Formula
N/mm² = psi × 0.006894757293168
or N/mm² = psi ÷ 145.0377377302
Derivation from SI units:
- 1 psi = 1 lbf/in² = (0.45359237 kg × 9.80665 m/s²) ÷ (0.0254 m)² = 6894.757293168 Pa
- 1 N/mm² = 1 N ÷ 10⁻⁶ m² = 10⁶ Pa = 1 MPa
- 1 psi = 6894.757293168 Pa ÷ 1000000 Pa per N/mm² = 0.006894757293168 N/mm²
Both units are defined exactly, so the factor is exact. psi definition: psi; Newton per Square Millimetre definition: newton per square millimetre.
Worked examples
- A reading of 14.7 psi converts to 0.1013529322 N/mm².
14.7 psi × 0.006894757293 = 0.1013529322 N/mm² - A value of 60 psi is 0.4136854376 N/mm².
60 psi × 0.006894757293 = 0.4136854376 N/mm²
psi to Newton per Square Millimetre conversion table
| psi | Newtons per Square Millimetre (N/mm²) |
|---|---|
| 0.01 psi | 0.00006894757293 N/mm² |
| 0.05 psi | 0.0003447378647 N/mm² |
| 0.1 psi | 0.0006894757293 N/mm² |
| 0.25 psi | 0.001723689323 N/mm² |
| 0.5 psi | 0.003447378647 N/mm² |
| 1 psi | 0.006894757293 N/mm² |
| 2 psi | 0.01378951459 N/mm² |
| 5 psi | 0.03447378647 N/mm² |
| 10 psi | 0.06894757293 N/mm² |
| 14.7 psi | 0.1013529322 N/mm² |
| 15 psi | 0.1034213594 N/mm² |
| 20 psi | 0.1378951459 N/mm² |
| 25 psi | 0.1723689323 N/mm² |
| 30 psi | 0.2068427188 N/mm² |
| 32 psi | 0.2206322334 N/mm² |
| 35 psi | 0.2413165053 N/mm² |
| 40 psi | 0.2757902917 N/mm² |
| 50 psi | 0.3447378647 N/mm² |
| 60 psi | 0.4136854376 N/mm² |
| 80 psi | 0.5515805835 N/mm² |
| 100 psi | 0.6894757293 N/mm² |
| 125 psi | 0.8618446616 N/mm² |
| 150 psi | 1.034213594 N/mm² |
| 200 psi | 1.378951459 N/mm² |
| 500 psi | 3.447378647 N/mm² |
| 1000 psi | 6.894757293 N/mm² |
| 3000 psi | 20.68427188 N/mm² |
| 5000 psi | 34.47378647 N/mm² |
Where it's used
psi are used for tyre pressure in the United States (about 30–35 psi for cars), while newtons per square millimetre appear in steel yield and tensile strength (S355: 355 N/mm²). Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.
psi to other pressure units
| Conversion | 1 psi equals |
|---|---|
| psi to newton per square millimetre | 0.006894757293 N/mm² |
| psi to pascal | 6894.757293 Pa |
| psi to kilopascal | 6.894757293 kPa |
| psi to ksi | 0.001 ksi |
| psi to kilogram-force per square centimetre | 0.07030695796 kgf/cm² |
| psi to bar | 0.06894757293 bar |
| psi to millimeter of mercury | 51.7149252 mmHg |
| psi to inch of water | 27.67990471 inH₂O |
Show 12 more units
| psi to atmosphere | 0.06804596391 atm |
|---|---|
| psi to megapascal | 0.006894757293 MPa |
| psi to gigapascal | 0.000006894757293 GPa |
| psi to kilogram-force per square millimetre | 0.0007030695796 kgf/mm² |
| psi to millibar | 68.94757293 mbar |
| psi to torr | 51.71493257 Torr |
| psi to millimeter of water | 703.0695796 mmH₂O |
| psi to centimeter of water | 70.30695796 cmH₂O |
| psi to inch of mercury | 2.036020677 inHg |
| psi to decibar | 0.6894757293 dbar |
| psi to inch of water (60 °F) | 27.7075924 inH₂O (60 °F) |
| psi to barye | 68947.57293 Ba |
Frequently asked questions
How many newtons per square millimetre are in 1 psi?
1 psi = 0.006894757293 N/mm².
How do I convert psi to newtons per square millimetre?
Multiply the value in psi by 0.006894757293, or divide it by 145.0377377. For example, 15 psi × 0.006894757293 = 0.1034213594 N/mm².
Is the psi to N/mm² conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "pound-force per square inch (psi)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4, coherent derived units with special names.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert psi to Newtons per Square Millimetre (psi to N/mm2). Retrieved October 25, 2026, from https://scientificconverters.com/pressure/psi-to-newton-per-square-millimeter/
IEEE
Scientific Converters, "Convert psi to Newtons per Square Millimetre (psi to N/mm2)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/pressure/psi-to-newton-per-square-millimeter/