Convert Square Meters per Second to mm²/s

Formula

mm²/s = m²/s × 1000000

Derivation from SI units:

• 1 m²/s = 1 m² ÷ 1 s
• 1 mm²/s = 10⁻⁶ m²/s = 1 cSt

Both units are defined exactly, so the factor is exact. Square Meter per Second definition: square meter per second; Square Millimeter per Second definition: square millimeter per second.

Worked examples

1. A reading of 0.00001 m²/s converts to 10 mm²/s.
   0.00001 m²/s × 1000000 = 10 mm²/s
2. A value of 0.0005 m²/s is 500 mm²/s.
   0.0005 m²/s × 1000000 = 500 mm²/s

Where it's used

Square Meters per Second are used for reynolds-number and pipe-flow calculations (Re = vD/ν), while square millimeters per second appear in lubricant ISO VG grades (VG 32, 46, 68 …). Both measure kinematic viscosity (dynamic viscosity divided by density), so the conversion is a fixed factor.

Square Meter per Second to other kinematic viscosity units

Frequently asked questions

Sources

• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 2, coherent derived units.
• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 2 with SI prefix milli.

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.