Stress converter
Stress Converter – 10 Units, Exact Factors
1 pound per square inch = 0.0068948 megapascals
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- 1 psi = 0.0068948 MPa
- 5 psi = 0.034474 MPa
- 10 psi = 0.068948 MPa
- 25 psi = 0.17237 MPa
- MegapascalsMPa
- GigapascalsGPa
- KilopascalskPa
- PascalsPa
- Newtons per square millimetreN/mm²
- Pounds per square inchpsi
- Kips per square inch (US)ksi
- Pounds-force per square footlbf/ft²
- Barbar
- Kilograms-force per cm²kgf/cm²
- HectopascalshPa
- Millibarmbar
- Standard atmospheresatm
- Millimetres of mercurymmHg
- TorrTorr
- Inches of mercury (US)inHg
- Inches of water (US)inH₂O
- Megapascals0.0068948MPa
- Gigapascals0.0000068948GPa
- Kilopascals6.8948kPa
- Pascals6,894.8Pa
- Newtons per square millimetre0.0068948N/mm²
- Pounds per square inch1psi
- Kips per square inch (US)0.001ksi
- Pounds-force per square foot144lbf/ft²
- Bar0.068948bar
- Kilograms-force per cm²0.070307kgf/cm²
- Hectopascals68.948hPa
- Millibar68.948mbar
- Standard atmospheres0.068046atm
- Millimetres of mercury51.715mmHg
- Torr51.715Torr
- Inches of mercury (US)2.036inHg
- Inches of water (US)27.68inH₂O
About stress conversions
Mechanical stress and material strength (yield, tensile, elastic modulus). Stress has the same units as pressure: 1 N/mm² is exactly 1 MPa, and 1 ksi is exactly 1,000 psi.
Common stress conversions
- Pounds per square inch to megapascals
- Megapascals to pounds per square inch
- Kips per square inch to megapascals
- Megapascals to kips per square inch
- Gigapascals to pounds per square inch
- Gigapascals to kips per square inch
- Newtons per square millimetre to pounds per square inch
- Pounds-force per square foot to kilopascals
Stress units explained
| Unit | System | Definition and notes |
|---|---|---|
| Megapascal (MPa) | SI (metric) | 1 MPa = 1,000,000 Pa (exact) |
| Gigapascal (GPa) | SI (metric) | 1 GPa = 1,000,000,000 Pa (exact)Defined as exactly 10⁹ Pa. Used for elastic moduli (steel is about 200 GPa). |
| Kilopascal (kPa) | SI (metric) | 1 kPa = 1,000 Pa (exact) |
| Pascal (Pa) | SI (metric) | Base unitThe SI unit of pressure: one newton of force on one square metre. |
| Newton per square millimetre (N/mm²) | SI (metric) | 1 N/mm² = 1,000,000 Pa (exact)Defined as exactly 1 MPa. Common in European structural codes (Eurocode). |
| Pound per square inch (psi) | US & imperial (identical) | 1 psi ≈ 6,894.7573 PaPounds of force per square inch, about 6,894.757 Pa. Common for tyres and gauges in the US. |
| Kip per square inch (ksi) | US customary | 1 ksi ≈ 6,894,757.3 PaA thousand psi, about 6.8948 MPa. Used for material strength in US practice. |
| Pound-force per square foot (lbf/ft²) | US & imperial (identical) | 1 lbf/ft² ≈ 47.880259 PaPounds of force per square foot, about 47.88 Pa. Used for wind, snow and floor loads. |
| Bar (bar) | metric (non-SI) | 1 bar = 100,000 Pa (exact)Defined as exactly 100,000 Pa. |
| Kilogram-force per cm² (kgf/cm²) | other | 1 kgf/cm² = 98,066.5 Pa (exact) |
| Hectopascal (hPa) | SI (metric) | 1 hPa = 100 Pa (exact)100 Pa; numerically equal to a millibar. Used in weather reports. |
| Millibar (mbar) | metric (non-SI) | 1 mbar = 100 Pa (exact) |
| Standard atmosphere (atm) | other | 1 atm = 101,325 Pa (exact)Defined as exactly 101,325 Pa. |
| Millimetre of mercury (mmHg) | other | 1 mmHg = 133.322387415 Pa (exact)Millimetres of mercury, fixed at 133.322387415 Pa. Used for blood pressure. |
| Torr (Torr) | other | 1 Torr ≈ 133.32237 PaExactly 1/760 of a standard atmosphere. Very close to, but not quite, 1 mmHg. |
| Inch of mercury (inHg) | US customary | 1 inHg ≈ 3,386.3886 PaInches of mercury (25.4 mmHg), about 3,386.389 Pa. Used in US weather reports and aviation. |
| Inch of water (inH₂O) | US customary | 1 inH₂O = 249.08891 Pa (exact)Inches of water, fixed at 249.08891 Pa. Used for low pressures such as ducts and gas lines. |
Pounds per square inch to megapascals conversion table
| Pounds per square inch (psi) | Megapascals (MPa) |
|---|---|
| 1 psi | 0.0068948 MPa |
| 5 psi | 0.034474 MPa |
| 10 psi | 0.068948 MPa |
| 20 psi | 0.1379 MPa |
| 25 psi | 0.17237 MPa |
| 30 psi | 0.20684 MPa |
| 36 psi | 0.24821 MPa |
| 40 psi | 0.27579 MPa |
| 50 psi | 0.34474 MPa |
| 60 psi | 0.41369 MPa |
| 75 psi | 0.51711 MPa |
| 100 psi | 0.68948 MPa |
| 150 psi | 1.0342 MPa |
| 200 psi | 1.379 MPa |
| 250 psi | 1.7237 MPa |
| 300 psi | 2.0684 MPa |
| 355 psi | 2.4476 MPa |
| 400 psi | 2.7579 MPa |
| 500 psi | 3.4474 MPa |
| 1,000 psi | 6.8948 MPa |
Frequently asked questions
Which stress units can I convert?
megapascals (MPa), gigapascals (GPa), kilopascals (kPa), pascals (Pa), newtons per square millimetre (N/mm²), pounds per square inch (psi), kips per square inch (ksi), pounds-force per square foot (lbf/ft²), bar (bar), kilograms-force per cm² (kgf/cm²).
How accurate are the results?
Every unit is stored with its exact defining factor (NIST SP 811, NIST Handbook 44 or the BIPM SI Brochure). Calculations use double-precision arithmetic and are rounded only for display, to 5 significant figures by default (trailing zeros dropped, so 1 km shows as 1000 m). You can choose Auto (up to 10 digits), fixed decimals or more significant figures, or switch to scientific or engineering notation.
Is stress measured in the same units as pressure?
Yes. Stress and pressure are both force per area, so they share units: 1 MPa = 1 N/mm² exactly, and 1 ksi = 1 000 psi ≈ 6.894757 MPa. Engineers usually quote stress in MPa, N/mm², psi or ksi.