Newton per Square Millimetre (N/mm²)

The newton per square millimetre (N/mm²) is a force of one newton on one square millimetre. It is exactly equal to one megapascal and is the usual way European steel and concrete standards write strength.

Symbol: N/mm² (ASCII: N/mm2)

Quantity: pressure, stress and differential pressure (force per unit area)

SI relation: 1 N/mm² = 1000000 Pa (exact)

Derivation: 1 N/mm² = 1 N ÷ 10⁻⁶ m² = 10⁶ Pa = 1 MPa

Exact: yes, by definition

Same quantity as megapascal (MPa) : the factor between them is exactly 1.

Typical uses

Steel yield and tensile strength (S355: 355 N/mm²)
Concrete grades (C30/37: 30 N/mm² cylinder strength)
Bolt and weld design stresses

Convert newtons per square millimetre to other units

1 N/mm² in other pressure units
Conversion	1 N/mm² equals	Reverse
newton per square millimetre to pascal	1000000 Pa	pascal to newton per square millimetre
newton per square millimetre to kilopascal	1000 kPa	kilopascal to newton per square millimetre
newton per square millimetre to ksi	0.1450377377 ksi	ksi to newton per square millimetre
newton per square millimetre to kilogram-force per square centimetre	10.19716213 kgf/cm²	kilogram-force per square centimetre to newton per square millimetre
newton per square millimetre to psi	145.0377377 psi	psi to newton per square millimetre
newton per square millimetre to bar	10 bar	bar to newton per square millimetre
newton per square millimetre to millimeter of mercury	7500.615758 mmHg	millimeter of mercury to newton per square millimetre
newton per square millimetre to inch of water	4014.63076 inH₂O	inch of water to newton per square millimetre
newton per square millimetre to atmosphere	9.869232667 atm	atmosphere to newton per square millimetre
newton per square millimetre to megapascal	1 MPa	megapascal to newton per square millimetre
newton per square millimetre to gigapascal	0.001 GPa	gigapascal to newton per square millimetre
newton per square millimetre to kilogram-force per square millimetre	0.1019716213 kgf/mm²	kilogram-force per square millimetre to newton per square millimetre
newton per square millimetre to millibar	10000 mbar	millibar to newton per square millimetre
newton per square millimetre to torr	7500.616827 Torr	torr to newton per square millimetre
newton per square millimetre to millimeter of water	101971.6213 mmH₂O	millimeter of water to newton per square millimetre
newton per square millimetre to centimeter of water	10197.16213 cmH₂O	centimeter of water to newton per square millimetre
newton per square millimetre to inch of mercury	295.299833 inHg	inch of mercury to newton per square millimetre
newton per square millimetre to decibar	100 dbar	decibar to newton per square millimetre
newton per square millimetre to inch of water (60 °F)	4018.64652 inH₂O (60 °F)	inch of water (60 °F) to newton per square millimetre
newton per square millimetre to barye	10000000 Ba	barye to newton per square millimetre

Open the Pressure Converter to convert any value between all units.

Sources

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: 2026-10-15. 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). Newton per Square Millimetre (N/mm²). Retrieved October 25, 2026, from https://scientificconverters.com/units/newton-per-square-millimeter/

IEEE

Scientific Converters, "Newton per Square Millimetre (N/mm²)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/newton-per-square-millimeter/