Convert cubic inches, feet, centimeters, milliliters, liters, or meters to US customary, Imperial, or US nutrition-label (30 mL) fluid ounces and back with one entered value.
Assumptions Assumptions
- Conversions are volume-to-volume only—no density or weight adjustments.
- All units are converted through milliliters (mL) as the base: 1 in³ = 16.387064 mL.
- Fluid-ounce standards used: US = 29.5735295625 mL, Imperial (UK) = 28.4130625 mL, US nutrition-label = 30 mL.
- Results are idealized; container shape or fill levels are not considered.
When to Use This Calculator
- Converting container or package volume (in³) to labeled fluid ounces for beverages or chemicals.
- Estimating volume from dimensions for shipping, storage, or 3D-printed parts.
- Switching between US, Imperial (UK), and US nutrition-label fluid-ounce standards.
Input Definitions
- Cubic Inches — select in³, ft³, cm³, mL, L, or m³; all convert via mL.
- Fluid Ounces — select US fl oz (29.5735 mL), Imperial fl oz (28.4131 mL), or US nutrition-label fl oz (30 mL).
- Conversions — US: fl oz = in³ ÷ 1.8046875; in³ = fl oz × 1.8046875. General: fl oz = in³ × (16.387064 ÷ fl_oz_mL).
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in^3 to Fluid Ounces Formula
The following formulas convert cubic inches to US fluid ounces and back; a general approach using milliliters is noted in the accordion.
- 1 cubic inch = 16.387064 mL
- US fluid ounce = 29.5735295625 mL
- Imperial (UK) fluid ounce = 28.4130625 mL
- US nutrition-label fluid ounce = 30 mL
How do you convert in³ to fluid ounces? In US units, divide cubic inches by 1.8046875; for other standards, convert in³ to mL (×16.387064) and divide by the chosen fl oz size in mL.
How do you convert fluid ounces to in³? For US units, multiply fl oz by 1.8046875; generally, multiply fl oz by its mL value and divide by 16.387064 to get in³.
in^3 to Fluid Ounces Conversion Table
| Cubic Inches | Fluid Ounces (US) |
|---|---|
| 1 | 0.554 |
| 2 | 1.108 |
| 3 | 1.662 |
| 4 | 2.216 |
| 5 | 2.771 |
| 6 | 3.325 |
| 8 | 4.433 |
| 10 | 5.541 |
| 12 | 6.649 |
| 14 | 7.758 |
| 16 | 8.866 |
| 20 | 11.082 |
| 24 | 13.299 |
| 28 | 15.515 |
| 32 | 17.732 |
| 36 | 19.948 |
| 40 | 22.165 |
| 48 | 26.597 |
| 64 | 35.463 |
| * US customary: 1 fl oz = 1.8046875 in³ (so 1 in³ = 128/231 fl oz). | |
Example Problem
Convert 36.09375 in³ to US fluid ounces.
Use the US formula: fl oz = in³ ÷ 1.8046875.
fl oz = 36.09375 ÷ 1.8046875 = 20 fl oz
