Convert Square Centimeters per Second to mm²/s

Formula

mm²/s = cm²/s × 100

Derivation from SI units:

• 1 cm²/s = 10⁻⁴ m²/s = 1 St
• 1 mm²/s = 10⁻⁶ m²/s = 1 cSt
• 1 cm²/s = 0.0001 m²/s ÷ 0.000001 m²/s per mm²/s = 100 mm²/s

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

Worked examples

1. A reading of 0.1 cm²/s converts to 10 mm²/s.
   0.1 cm²/s × 100 = 10 mm²/s
2. A value of 0.5 cm²/s is 50 mm²/s.
   0.5 cm²/s × 100 = 50 mm²/s

Where it's used

Square Centimeters per Second are used for diffusion coefficients (gases in air ≈ 0.1–0.2 cm²/s), 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 Centimeter 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 with SI prefix centi.
• 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.