Convert Cubic Inches to Milliliters

Formula

mL = in³ × 16.387064

Derivation from SI units:

• 1 in³ = (0.0254 m)³ = 1.6387064 × 10⁻⁵ m³ = 16.387064 cm³
• 1 mL = 10⁻³ L = 1 cm³ = 10⁻⁶ m³
• 1 in³ = 0.000016387064 m³ ÷ 0.000001 m³ per mL = 16.387064 mL

Both units are defined exactly, so the factor is exact. Cubic Inch definition: cubic inch; Milliliter definition: milliliter.

Worked examples

1. A reading of 61.024 in³ converts to 1000.004194 mL.
   61.024 in³ × 16.387064 = 1000.004194 mL
2. A value of 350 in³ is 5735.4724 mL.
   350 in³ × 16.387064 = 5735.4724 mL

Where it's used

Cubic Inches are used for US engine displacement (e.g. 350 cubic inches ≈ 5.7 L), while milliliters appear in medicine doses and syringes. Both measure volume (capacity), so the conversion is a fixed factor.

Cubic Inch to other volume units

Frequently asked questions

Sources

• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "cubic inch (in³)".
• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8, litre 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.