Volume Converter: US Gallons to Liters Fuel Economy, UK Gallons Difference, Cubic Feet to m³ Container
Convert between milliliters, liters, cubic meters, cubic centimeters, cubic inches, cubic feet, US gallons, UK gallons, fluid ounces and cups. US and UK gallons are handled separately to avoid mix-ups. Get instant conversions for all units at once, swap source and target, copy the result, or browse the all-units overview — essential for cooking, shipping and chemistry.
Volume conversion
Volume Convert
All units overview
All Units Overview
How to Use
Volume Converter Guide
Metric / Imperial / Cooking
The volume (capacity) converter covers 13 units across metric, imperial and cooking systems for kitchen recipes, liquid-container measurement, shipping, chemistry, import/export and beverage/cosmetics labeling. Metric is based on the liter, imperial distinguishes US and UK gallons (which differ significantly), and the cooking “cup” is included. Enter any volume to instantly convert all units, helping you switch between recipes, container labels and measurement systems in different countries.
01 Unit systems
Metric is based on the liter (L): 1 L = 1000 mL = 1 cubic decimeter, 1 cubic meter = 1000 L, 1 cubic centimeter = 1 mL. Imperial splits into US and UK: 1 US gallon ≈ 3.785 L, 1 UK gallon ≈ 4.546 L — about 20% different, so always check which standard applies when refueling or buying imported liquids. The US fluid ounce ≈ 29.57 mL is common on beverage and cosmetics labels.
Among cooking units, the cup is a common rough measure: 1 cup ≈ 240 mL (US standard), with ±10 mL variation across recipes. Cubic inches and cubic feet are used in engineering and freight: 1 ft³ ≈ 28.32 L, 1 in³ ≈ 16.39 mL.
- 1 L = 1000 mL = 0.001 m³
- 1 US gal ≈ 3.785 L
- 1 UK gal ≈ 4.546 L
- 1 US fl oz ≈ 29.57 mL
- 1 cup ≈ 240 mL (US standard)
- 1 ft³ ≈ 28.32 L
02 How to use
Enter a volume and choose the source unit (e.g. liters); the right instantly shows the target (e.g. US gallons or fluid ounces), and the all-units overview lists mL, m³, gallons, fl oz, cups and more. US and UK gallons are labeled separately to avoid confusion. The copy button copies the result for recording purchase quantities or preparing formulas.
Inputs and actions
- value fieldEnter the numeric volume to convert; results update instantly.
- unit buttonsTap a unit to set it as source (left) or target (right); the active pair is highlighted.
- ⇄ SwapReverses the source and target units in one click.
- CopyCopies the full "X unit = Y unit" result to the clipboard.
- ResetRestores the default source/target units and value.
Output
- target resultThe converted volume in the selected target unit (read-only).
- rate tipShows the forward and reverse conversion factors.
- all unitsLists the value converted into every available unit at once; source is green, target blue.
- US and UK gallons differ (US ≈ 3.785 L, UK ≈ 4.546 L) — confirm which standard applies
- 1 m³ = 1000 L
- 1 cup ≈ 240 mL in cooking, with ±10 mL variation between recipes
- US fl oz ≈ 29.57 mL; UK fl oz ≈ 28.41 mL — this tool defaults to US
FinCompute’s free online volume and capacity converter covers 13 metric, imperial and cooking units — clearly distinguishing US and UK gallons. Whether you need US gallons to liters for fuel economy, the UK gallon difference, or cubic feet to cubic meters for a shipping container, enter any value and see all results instantly.
Metric volume: milliliters, liters, cubic meters and cc for engine displacement
1 liter = 1000 mL = 1 cubic decimeter (dm³), 1 m³ = 1000 L, 1 cm³ = 1 mL (1 cc = 1 mL) — the international standard capacity units. A 2000cc engine = 2.0 L; "how to convert engine displacement from cc to liters" is a common query.
US vs UK gallons: know the difference for fuel economy
1 US gallon ≈ 3.785 L, 1 UK (imperial) gallon ≈ 4.546 L — about 20% apart. The US fluid ounce ≈ 29.57 mL; the UK fluid ounce ≈ 28.41 mL. Always pick the right gallon when comparing mpg fuel economy or filling up abroad, or your mpg figures will be wrong.
Cooking units: cups, mL and fluid ounces for recipe conversion
1 US legal cup = 240 mL (food labeling standard), 1 US customary cup ≈ 236.6 mL, 1 UK cup ≈ 284 mL. "How many mL in a US cup for baking" and "how many mL in a fluid ounce" can be converted in one click; for precise baking, weigh ingredients rather than relying on volume cups.
Common volume conversions: containers, fuel, baking and engine size
Drivers compare fuel economy between L/100km and mpg; shippers compute container volume in m³ or cubic feet (20-foot ≈ 33 m³, 40-foot ≈ 67 m³); chemists convert liters to cm³; home brewers switch between gallons and liters; travelers compare drink sizes in fluid ounces vs mL.
Volume conversion formulas: 231 in³ US gallon and legal 4.54609 L UK gallon
Liters to US gallons: US gal = L ÷ 3.7854. Liters to UK gallons: UK gal = L ÷ 4.5461. mL to US fl oz: fl oz = mL ÷ 29.574. Cubic feet to liters: L = ft³ × 28.317. 1 US gallon = 231 in³ exactly; the UK imperial gallon is legally defined as exactly 4.54609 L.
Last updated: 2026-08-23
FAQ
QWhat is the difference between US and UK gallons?
1 US gal ≈ 3.785 L; 1 UK gal ≈ 4.546 L — the UK gallon is about 20% larger. The US uses the older English wine gallon; the UK adopted a new standard in 1824.
QHow many mL in a liter?
1 liter = 1000 mL = 1000 cm³ exactly.
QHow many liters in a cubic meter?
1 m³ = 1000 L exactly.
QHow many mL in a cup?
US legal cup (food labeling) = 240 mL; US customary cup ≈ 236.6 mL; UK cup ≈ 284 mL. Most online recipes use the 240 mL standard.
QHow many mL in a fluid ounce?
US fl oz ≈ 29.57 mL; UK fl oz ≈ 28.41 mL. This tool defaults to US.
QHow do I convert engine displacement from cc to liters?
1 cc = 1 cm³ = 1 mL. A 2000cc engine = 2000 mL = 2.0 L. Divide cc by 1000 to get liters.
QAre dry and liquid measures the same?
No. In the US, a dry gallon (≈4.405 L) differs from a liquid gallon (≈3.785 L). A bushel (≈35.24 L) is used for dry commodities. This converter covers liquid volume only.
QHow many liters are in a US gallon of fuel?
1 US gallon ≈ 3.7854 L, while 1 UK (imperial) gallon ≈ 4.5461 L — about 20% larger. Pick the right gallon when comparing fuel economy or filling up abroad.
QHow many cubic meters are in a shipping container?
A standard 20-foot container has an internal volume of about 33 m³ (≈1,170 ft³), and a 40-foot container about 67 m³ (≈2,370 ft³). Enter the m³ or ft³ value to convert between them instantly.
QHow many mL are in a US cup for a recipe?
1 US legal cup (food labeling) = 240 mL; a US customary cup ≈ 236.6 mL. Most online recipes use the 240 mL standard. Type the cup value into the converter to see mL, liters, fluid ounces and more.
QHow do I convert 2000 cc engine displacement to liters?
1 cc = 1 cm³ = 1 mL, so 2,000 cc = 2,000 mL = 2.0 L. Divide cc by 1,000 to get liters, or just enter the cc value as cm³ in the volume converter.
QHow many ounces are in a US gallon?
1 US gallon = 128 US fluid ounces ≈ 3.785 L. The UK imperial gallon holds 160 UK fluid ounces ≈ 4.546 L. The difference is why "half a gallon" in the US and the UK are not the same size drink.
QHow many liters does a 40-foot shipping container hold?
A 40-foot standard dry container has an internal volume of about 67 m³ (≈ 67,000 L ≈ 2,370 ft³), while a 40-foot high-cube reaches about 76 m³. Enter the m³ value into the converter to see gallons, cubic feet and other units.