How to Convert Liters, Gallons, Cups & Ounces
If you cook from American food blogs, watch UK recipe videos or buy drinks in Europe, you've probably hit the same wall: why are volume units so different everywhere? One recipe says "2 cups of milk", another says "500 mL", and on the bottle you only see liters.
This volume converter is designed for real people who just want a fast, accurate answer without memorizing formulas. Type a value once and instantly see it in liters, milliliters, US & UK gallons, cups, pints, quarts, ounces and more.
For simple percentage changes you can also use our Percentage Calculator, and if you're working with interest or loans, check the Loan Calculator and Compound Interest Calculator.
Key Volume Units Used in the US, UK & Worldwide
- Liter (L) – Standard metric unit used almost everywhere outside the US.
- Milliliter (mL) – Small metric unit for drinks, medicine and lab work. 1,000 mL = 1 L.
- US Gallon – Used in the United States for gas, milk and big jugs. 1 US gal ≈ 3.785 L.
- UK (Imperial) Gallon – Used in older UK recipes and specs. 1 UK gal ≈ 4.546 L.
- US Cup – Very common in US recipes. 1 cup ≈ 236.6 mL.
- Metric Cup – Used in Australia and some other countries. 1 metric cup = 250 mL.
- US Fluid Ounce (fl oz) – 1 fl oz ≈ 29.57 mL.
- Tablespoons (tbsp) & Teaspoons (tsp) – Standard kitchen spoon sizes.
For temperature conversions (°C to °F and back), use our Temperature Converter alongside this volume tool when following international recipes.
Essential Conversion Facts to Remember
- 1 Liter ≈ 4 US cups (exact: 4.227 cups).
- 1 Liter ≈ 1.06 US quarts.
- 1 US Gallon ≈ 3.785 Liters.
- 1 Cup ≈ 240 mL in most home kitchens (exact US cup: 236.6 mL).
- 1 fl oz ≈ 30 mL (exact: 29.57 mL).
When you need exact numbers — medication, lab work, baking at scale — use the converter instead of mental approximations.
Real-Life Examples (US, UK & Metric)
- US recipe: 2 cups of milk → about 473 mL.
- UK recipe: 1 pint of stock (UK pint) → about 568 mL.
- Metric recipe: 500 mL cream → about 2.11 US cups.
- US 1-gallon milk jug → about 3.785 L.
- European 1.5 L soda bottle → about 6.3 US cups.
- Standard wine bottle (750 mL) → about 3.17 US cups.
- Car coolant: often sold by the US gallon in the US but specified in liters in manuals.
- Lab or school experiments: usually written in mL and L only.
- DIY projects: paint and chemicals may mix US and metric units on the same label.
Common Mistakes (Especially Between US & UK)
- Mixing up US and UK gallons: UK gallon is about 20% larger. Always check which one the recipe or manual means.
- Assuming cups are the same everywhere: US cup (236.6 mL) vs metric cup (250 mL).
- Confusing volume with weight: 100 mL of water weighs 100 g, but 100 mL of oil or honey does not.
- Reading measurements from the wrong angle: always read at eye level, from the bottom of the meniscus.
If you also need to convert money amounts while shopping online in different countries, try our Currency Converter.
Why This Tool Is Useful for US, UK, CA & AU Users
- US home cooks can quickly convert European and Australian recipes to cups and fl oz.
- UK users can see both imperial and metric values side by side.
- Canadians, Australians and Europeans can easily switch between cups, liters and mL.
- Students and professionals can download TXT/CSV history for school, lab or work notes.
FAQ – Volume Converter (Liters, Gallons, Cups, Ounces)
How do I convert liters to US gallons?
Multiply liters by 0.264172. For example, 5 L × 0.264172 ≈ 1.32 US gallons. The converter does this instantly for you.
What is the difference between a US gallon and a UK gallon?
1 US gallon ≈ 3.785 L, while 1 UK (imperial) gallon ≈ 4.546 L. A UK gallon is about 20% larger, so always check which one the recipe uses.
How many milliliters are in a US cup?
1 US cup is exactly 236.588 mL, but many home cooks round to 240 mL. This converter uses the precise value.
How many US cups are in 1 liter?
1 liter is about 4.23 US cups. A quick mental rule is "1 L ≈ 4 cups", which is close enough for most recipes.
How many milliliters are in a US fluid ounce?
1 US fluid ounce is exactly 29.5735 mL. Many people round this to 30 mL when doing quick kitchen math.
Can I use this converter for baking in the US, UK, Canada and Australia?
Yes. It supports US cups, metric cups, mL, liters, US and UK gallons, so it works for recipes from US, UK, CA, AU and European blogs.
Is it better to measure by volume or by weight when baking?
For liquids, volume is fine. For flour, sugar and other dry ingredients, weight (grams) is more accurate, especially for professional baking.
Can I download my volume conversions for later?
Yes. Use the TXT or CSV download buttons under "Conversion History" to save your recent conversions for recipes, lab notes or work.