Oz to Litres Converter
Convert fluid ounces to litres with a single input. This oz to litres calculator handles US fluid ounce to litre conversion instantly — no sign-up, no limits. Whether you need a quick volume conversion for a cooking measurement or liquid measurement for a recipe, the result updates as you type.
Oz to Litres Converter
Calculator
Definition
An ounce (oz) in liquid measurement means a fluid ounce, a volume unit used in US customary units and the Imperial system. A litre (also spelled liter) is a metric volume unit equal to 1,000 millilitres.
1 US fluid ounce = 0.0295735 litres. 1 litre = 33.814 US fluid ounces.
Popular Volume Unit Conversions
Click a pair to see its metric relationship.
How It Works
Three simple steps to convert fluid ounces to litres with perfect accuracy.
Enter Your Value
Type any fluid ounce value into the converter. Supports whole numbers and decimals.
Apply the Formula
Our engine multiplies by the precise conversion factor: 1 fl oz = 0.0295735 L.
Get Your Result
Your litre value appears instantly. Copy it or explore the conversion table for more.
See Your Conversion
Watch the measuring cup fill in real-time as you adjust the fluid ounce value.
Dynamic Conversion Scale
Enter a fluid ounce value below and watch the measuring cup fill proportionally. The scale bar shows where your value falls between 0 and 128 oz (1 gallon).
Convert Ounces to Litres Instantly
Understand the fluid ounce and the litre — the two units at the heart of this conversion.
Fluid Ounces (US)
A US fluid ounce is a volume unit in the US customary units system. It equals exactly 29.5735295625 millilitres (mL). The fluid ounce is used across the United States for liquid measurement — from beverage containers and drink serving sizes to cooking measurements and pharmaceutical dosing.
Don't confuse the US fluid ounce with the Imperial fluid ounce (UK). An Imperial fluid ounce is about 4% smaller at 28.4131 mL. The US version is the one used by default in this conversion calculator.
How to Convert Fluid Ounce (US) to Liter
Multiply the number of fluid ounces by 0.0295735. For example:
- 16 fl oz × 0.0295735 = 0.4732 litres (a standard water bottle)
- 8 fl oz × 0.0295735 = 0.2366 litres (one cup)
- 33.814 fl oz × 0.0295735 = 1.0000 litres (exactly one litre)
To go the other way — litres to ounces — multiply the litre value by 33.814.
US vs Imperial Fluid Ounce
The Imperial fluid ounce is about 4% smaller than the US fluid ounce. Both are volume units, not weight.
Litres (L)
The litre (spelled liter in American English) is the base volume unit of the metric system for everyday liquids. One litre equals 1,000 millilitres (mL) and is defined as one cubic decimetre.
Litres are the standard for labelling beverage containers in most of the world. A typical water bottle holds 0.5 litres, a wine bottle holds 0.75 litres, and a large soda bottle holds 2 litres.
Common Container Sizes in Litres
Click any beverage container to load its oz value into the converter.
Common Container Sizes
Click any beverage container to instantly convert its volume in the converter above.
Ounces to Litres Conversion Formula
The math behind every oz to litres conversion — and how to do it by hand.
Formula for converting oz to litres
The conversion formula uses a single fixed factor. One US fluid ounce equals exactly 0.0295735295625 litres. This number comes from the international definition of the litre and the legal definition of the US fluid ounce.
Whether you're doing a volume conversion for a school assignment or a cooking measurement, this same factor applies every time.
How to convert ounces to litres manually
That's all there is to it. No complex math, no multi-step process. You multiply by one number. For a rough mental estimate: 34 fluid ounces is close to 1 litre, and 68 fluid ounces is close to 2 litres.
Common Ounce to Litre Conversions Table
A ready-made conversion chart for the most searched oz to litres values. Click any row to fill the converter.
| Fluid Ounces (fl oz) | Litres (L) | Millilitres (mL) | Context |
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Understanding Volume Conversions
Everything you need to know about converting between fluid ounces and litres.
The conversion formula uses a single fixed factor. 1 US fluid ounce = 0.0295735295625 litres. This number comes from the international definition of the litre (1 cubic decimetre) and the legal definition of the US fluid ounce (1/128 of a US gallon).
To convert, multiply your fluid ounce value by 0.0295735. For example, 32 fl oz × 0.0295735 = 0.946353 litres — nearly one litre. To reverse (litres to ounces), multiply the litre value by 33.814.
A US fluid ounce equals approximately 29.5735 mL, while an Imperial fluid ounce (UK) equals approximately 28.4131 mL. The Imperial fluid ounce is about 4% smaller than the US version.
This means a "16 oz" drink in the US (473 mL) would be labelled differently in the UK system. Our converter uses the US fluid ounce by default — the most commonly searched standard worldwide.
Fluid ounces measure volume, while ounces (oz) measure weight/mass. They are entirely different units sharing the same name.
For water at room temperature, 1 fluid ounce weighs roughly 1 ounce — but this is a coincidence. For heavier liquids like honey or lighter ones like oil, the weight and volume diverge. Our converter works exclusively with fluid ounces (volume).
Oz-to-litre conversions come up constantly. Cooking: American recipes use fluid ounces, but metric kitchens use litres and millilitres. Travel: TSA allows 3.4 oz (100 mL) containers — that's 0.1 litres.
Hydration: Tracking daily water intake often requires converting between oz and litres. Shopping: Comparing beverage container sizes across US and international brands requires this exact volume conversion.
Frequently Asked Questions
Answers to the most common oz to litres questions.
There are about 33.814 US fluid ounces in 1 litre. If you're using Imperial fluid ounces (UK), 1 litre contains roughly 35.195 fluid ounces.
No. 32 US fluid ounces equals about 0.946 litres — roughly 5% less than a full litre. You need 33.814 fluid ounces for exactly 1 litre.
No. 24 US fluid ounces equals about 0.710 litres (710 millilitres) — about 71% of a full litre.
8 US fluid ounces equals about 0.2366 litres (237 millilitres) — the same as 1 standard US cup.
64 US fluid ounces equals about 1.893 litres — half a US gallon and close to many daily hydration targets.
40 US fluid ounces equals about 1.183 litres — just over 1 litre, a common water bottle size.
2 litres equals about 67.628 US fluid ounces. A standard 2-litre soda bottle holds this amount.
3 litres equals about 101.442 US fluid ounces — useful for tracking daily hydration.
8 litres equals about 270.512 US fluid ounces — slightly more than 2 US gallons (256 oz).