Megapascals to Newtons per Square Millimetre (MPa to N/mm2)

Formula

N/mm² = MPa × 1

Derivation from SI units:

• 1 MPa = 10⁶ Pa = 1 N/mm²
• 1 N/mm² = 1 N ÷ 10⁻⁶ m² = 10⁶ Pa = 1 MPa
• 1 MPa = 1000000 Pa ÷ 1000000 Pa per N/mm² = 1 N/mm²

Both units are defined exactly, so the factor is exact. Megapascal definition: megapascal; Newton per Square Millimetre definition: newton per square millimetre.

Worked examples

1. A reading of 2 MPa converts to 2 N/mm².
   2 MPa × 1 = 2 N/mm²
2. A value of 30 MPa is 30 N/mm².
   30 MPa × 1 = 30 N/mm²

Where it's used

Megapascals are used for concrete compressive strength (typically 20–50 MPa), 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.

Megapascal to other pressure units

Frequently asked questions

Sources

• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
• 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.