Convert Gallons per Minute to Cubic Centimeters per Second

Formula

cm³/s = GPM × 63.0901964

Derivation from SI units:

• 1 GPM = 231 in³ ÷ 60 s = 0.003785411784 m³ ÷ 60 s = 6.30901964 × 10⁻⁵ m³/s
• 1 cm³/s = 10⁻⁶ m³ ÷ 1 s
• 1 GPM = 0.0000630901964 m³/s ÷ 0.000001 m³/s per cm³/s = 63.0901964 cm³/s

Both units are defined exactly, so the factor is exact. Gallon per Minute definition: US gallon per minute; Cubic Centimeter per Second definition: cubic centimeter per second.

Worked examples

1. A reading of 3 GPM converts to 189.2705892 cm³/s.
   3 GPM × 63.0901964 = 189.2705892 cm³/s
2. A value of 25 GPM is 1577.25491 cm³/s.
   25 GPM × 63.0901964 = 1577.25491 cm³/s

Where it's used

Gallons per Minute are used for pump, well and irrigation ratings, while cubic centimeters per second appear in air permeability testers that report flow before dividing by area. Both measure volumetric flow rate (volume per unit time), so the conversion is a fixed factor.

Gallon per Minute to other flow rate 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, "gallon [U.S.] per minute (gpm)".
• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 2 with SI prefix centi.

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