Bottle Size Guide: mL, Litres, and Ounces
Compare common bottle capacities in millilitres, litres, and US fluid ounces, then calculate refills from a target you choose.
Common bottle comparisons
Bottle labels may use millilitres, litres, or US fluid ounces. The table gives quick comparisons; actual bottle capacities vary, so use the capacity printed on your own container.
A quick reference table
| Capacity | Litres | Approx. US fl oz | 500 mL equivalents |
|---|---|---|---|
| 355 mL | 0.355 L | 12.0 | 0.71 |
| 500 mL | 0.5 L | 16.9 | 1 |
| 750 mL | 0.75 L | 25.4 | 1.5 |
| 1,000 mL | 1 L | 33.8 | 2 |
| 1,500 mL | 1.5 L | 50.7 | 3 |
Calculate refills from your own amount
Divide the volume you want to plan by your bottle’s capacity. For example, 1,500 mL remaining with a 750 mL bottle is two bottlefuls. The refill calculator handles the arithmetic; you enter the target yourself.
Check which ounce or gallon you mean
US fluid ounces measure volume; ounces by weight measure mass. A US liquid gallon is about 3.785 L, while an Imperial gallon is 4.54609 L. The water volume conversion chart compares common units. NIST volume factors.
Common questions
Are bottle sizes standardized?
No. Use the capacity printed on your bottle.
How many US fluid ounces are in a litre?
About 33.814 US fluid ounces.
Is a refill count a daily recommendation?
No. It is arithmetic based on the target you choose.
Sources and further reading
Sources support the specific guidance described above. This page is general information, not diagnosis or individualized medical advice.