Convert US Gallons to Milliliters
1 US gallon (gal (US)) equals 3785.411784 milliliters (mL).
1 gal (US) = 3785.411784 mL
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk US gallon to milliliter converter to paste a column from Excel.
How to Convert US Gallon to Milliliter
- 1 gal (US) = 3785.411784 mL
- 1 mL = 0.0002641720524 gal (US)
- Example: convert 15 gal (US) to mL: 15 gal (US) = 15 × 3785.411784 mL = 56781.17676 mL
Formula
mL = gal (US) × 3785.411784
Derivation from SI units:
- 1 US gal = 231 in³ = 231 × (0.0254 m)³ = 0.003785411784 m³
- 1 mL = 10⁻³ L = 1 cm³ = 10⁻⁶ m³
- 1 gal (US) = 0.003785411784 m³ ÷ 0.000001 m³ per mL = 3785.411784 mL
Both units are defined exactly, so the factor is exact. US Gallon definition: US gallon; Milliliter definition: milliliter.
Worked examples
- A reading of 10 gal (US) converts to 37854.11784 mL.
10 gal (US) × 3785.411784 = 37854.11784 mL - A value of 100 gal (US) is 378541.1784 mL.
100 gal (US) × 3785.411784 = 378541.1784 mL
US Gallon to Milliliter conversion table
| US Gallons (gal (US)) | Milliliters (mL) |
|---|---|
| 0.25 gal (US) | 946.352946 mL |
| 0.5 gal (US) | 1892.705892 mL |
| 1 gal (US) | 3785.411784 mL |
| 2 gal (US) | 7570.823568 mL |
| 2.5 gal (US) | 9463.52946 mL |
| 5 gal (US) | 18927.05892 mL |
| 10 gal (US) | 37854.11784 mL |
| 15 gal (US) | 56781.17676 mL |
| 20 gal (US) | 75708.23568 mL |
| 25 gal (US) | 94635.2946 mL |
| 50 gal (US) | 189270.5892 mL |
| 55 gal (US) | 208197.6481 mL |
| 100 gal (US) | 378541.1784 mL |
| 275 gal (US) | 1040988.241 mL |
| 330 gal (US) | 1249185.889 mL |
| 500 gal (US) | 1892705.892 mL |
| 1000 gal (US) | 3785411.784 mL |
| 10000 gal (US) | 37854117.84 mL |
Where it's used
US Gallons are used for fuel, water and chemical volumes in the US, while milliliters appear in medicine doses and syringes. Both measure volume (capacity), so the conversion is a fixed factor.
US Gallon to other volume units
| Conversion | 1 gal (US) equals |
|---|---|
| US gallon to cubic meter | 0.003785411784 m³ |
| US gallon to liter | 3.785411784 L |
| US gallon to milliliter | 3785.411784 mL |
| US gallon to cubic centimeter | 3785.411784 cm³ |
| US gallon to cubic foot | 0.1336805556 ft³ |
| US gallon to cubic inch | 231 in³ |
| US gallon to imperial gallon | 0.8326741846 gal (imp) |
Frequently asked questions
How many milliliters are in 1 US gallon?
1 gal (US) = 3785.411784 mL.
How do I convert US gallons to milliliters?
Multiply the value in gal (US) by 3785.411784. For example, 15 gal (US) × 3785.411784 = 56781.17676 mL.
Is the gal (US) to mL conversion exact?
Yes. Both units are defined exactly, and 1 gal (US) is exactly 3785.411784 mL.
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.] (gal)".
- NIST Handbook 44, Appendix C: General Tables of Units of Measurement, National Institute of Standards and Technology , Appendix C.
- 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: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert US Gallons to Milliliters. Retrieved October 17, 2026, from https://scientificconverters.com/volume/us-gallons-to-milliliters/
IEEE
Scientific Converters, "Convert US Gallons to Milliliters," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/volume/us-gallons-to-milliliters/