Newtons per square millimetre to Pounds per square inch
1 newton per square millimetre = 145.04 pounds per square inch · 1 psi = 0.0068948 N/mm²
1 newton per square millimetre = 145.04 pounds per square inch
How it’s calculated
psi = N/mm² × 145.0377377
- Multiply the value in newtons per square millimetre by 145.0377377.
- To go back, divide by 145.0377377 (or multiply by 0.006894757293).
- 1 N/mm² = 145.0377377 psi · 1 psi = 0.006894757293 N/mm²
Show worked solutionFactor, unit cancellation and rounding, step by step
Find the conversion factor
By definition 1 N/mm² = 1000000 Pa and 1 psi = 6894.75729316836 Pa, so 1 N/mm² = 145.037737730209 psi. Source: BIPM SI Brochure (9th ed.); NIST SP 811 / Handbook 44.
Multiply by the factor written as a fraction
Put N/mm² in the denominator so it cancels, leaving psi.
Calculate (unrounded)
Round the answer
Rounded to 5 significant figures.
Answer: 145.04 psi
1 N/mm² in other units
Batch convert N/mm² → psi
- 1 N/mm² = 145.04 psi
- 5 N/mm² = 725.19 psi
- 10 N/mm² = 1450.4 psi
- 25 N/mm² = 3625.9 psi
Quick examples
- 1 newton per square millimetre = 145.04 pounds per square inch
- 5 newtons per square millimetre = 725.19 pounds per square inch
- 10 newtons per square millimetre = 1,450.4 pounds per square inch
- 25 newtons per square millimetre = 3,625.9 pounds per square inch
- 100 newtons per square millimetre = 14,504 pounds per square inch
About these units
Newton per square millimetre (N/mm²)
SI (metric)
Exactly 1 MPa. Common in European structural codes (Eurocode).
1 N/mm² = 1000000 Pa
Source: BIPM SI Brochure (9th ed.)
Pound per square inch (psi)
US & imperial (identical)
1 lbf/in² ≈ 6 894.757 Pa (derived from exact lbf and inch).
1 psi = 6894.757293 Pa
Source: NIST SP 811 / Handbook 44
Newtons per square millimetre to pounds per square inch conversion table
| Newtons per square millimetre (N/mm²) | Pounds per square inch (psi) |
|---|---|
| 1 N/mm² | 145.04 psi |
| 5 N/mm² | 725.19 psi |
| 10 N/mm² | 1,450.4 psi |
| 20 N/mm² | 2,900.8 psi |
| 25 N/mm² | 3,625.9 psi |
| 30 N/mm² | 4,351.1 psi |
| 36 N/mm² | 5,221.4 psi |
| 40 N/mm² | 5,801.5 psi |
| 50 N/mm² | 7,251.9 psi |
| 60 N/mm² | 8,702.3 psi |
| 75 N/mm² | 10,878 psi |
| 100 N/mm² | 14,504 psi |
| 150 N/mm² | 21,756 psi |
| 200 N/mm² | 29,008 psi |
| 250 N/mm² | 36,259 psi |
| 300 N/mm² | 43,511 psi |
| 355 N/mm² | 51,488 psi |
| 400 N/mm² | 58,015 psi |
| 500 N/mm² | 72,519 psi |
| 1,000 N/mm² | 145,040 psi |
Related conversions
Frequently asked questions
How do I convert newtons per square millimetre to pounds per square inch?
Use psi = N/mm² × 145.0377377. Multiply the value in newtons per square millimetre by 145.0377377.
How many pounds per square inch are in 1 newton per square millimetre?
1 newton per square millimetre (N/mm²) equals 145.04 pounds per square inch (psi); more precisely 145.0377377.
How many newtons per square millimetre are in 1 pound per square inch?
1 pound per square inch (psi) equals 0.0068948 newtons per square millimetre (N/mm²); more precisely 0.006894757293.
What is 10 N/mm² in psi?
10 newtons per square millimetre = 1,450.4 pounds per square inch.
What is a newton per square millimetre?
Exactly 1 MPa. Common in European structural codes (Eurocode).
What is a pound per square inch?
1 lbf/in² ≈ 6 894.757 Pa (derived from exact lbf and inch).
Formula: psi = N/mm² × 145.0377377. Factors last reviewed 2026-10-27.