🧪 Volume Conversion Calculator 2026
Convert between 80+ volume units — metric, US, UK, and specialty measures
1 gal (US) = 3.785 L
Formula: value × 3.78541
📊 All Conversions
Common Volume Conversions
| From | To | Multiply by |
|---|---|---|
| 1 liter (L) | US gallon | 0.264172 |
| 1 US gallon | liters | 3.78541 |
| 1 UK gallon | liters | 4.54609 |
| 1 cup (US) | milliliters | 236.588 |
| 1 fluid ounce (US) | milliliters | 29.5735 |
| 1 cubic foot | liters | 28.3168 |
| 1 cubic meter | liters | 1,000 |
Understanding Volume Units
📐 Metric
Liter (L) is base. 1 L = 1000 mL = 1 dm³. 1000 L = 1 m³. Consistent, decimal-based system used worldwide.
🇺🇸 US Customary
Gallon, quart, pint, cup, fl oz. 1 gal = 4 qt = 8 pt = 16 cups = 128 fl oz. Smaller than UK equivalents.
🇬🇧 UK Imperial
Imperial gallon = 4.546 L (larger than US). 1 imp gal = 4 qt = 8 pt = 160 fl oz. Used for some UK measures.
🍳 Cooking
Cups, tablespoons, teaspoons. US: 1 cup = 16 tbsp = 48 tsp. Metric cup = 250 mL. Australian tbsp = 20 mL.
Frequently Asked Questions
How many liters in a gallon?
US gallon: 3.785 liters. UK gallon: 4.546 liters. The UK gallon is
~20% larger than US gallon.
How many cups in a liter?
~4.227 US cups per liter. Metric cup (250 mL) = exactly 4 per
liter. Australian/Canadian often use metric cup.
How many ml in a cup?
US cup: 236.588 mL. Metric cup: 250 mL. UK cup: 284.131 mL.
Recipes may use different standards.
How many ounces in a liter?
~33.814 US fl oz per liter. UK: ~35.195 imp fl oz per liter. US oz
is slightly larger than UK oz.
How many ml in a tablespoon?
US tablespoon: 14.787 mL. Metric: 15 mL. Australian: 20 mL. UK:
17.758 mL.
How many ml in a teaspoon?
US teaspoon: 4.929 mL. Metric: 5 mL. 3 teaspoons = 1 tablespoon.
What is the difference between US and UK gallon?
UK gallon is larger. US = 3.785 L. UK = 4.546 L. ~20% difference.
"Imperial" = UK system.
How many cubic feet in a gallon?
~0.1337 cubic feet per US gallon. Or ~7.48 gallons per cubic foot.
How do I convert cubic meters to liters?
Multiply by 1000. 1 m³ = 1000 liters. 1 liter = 1 dm³ = 0.001 m³.
What is a fluid ounce?
US fl oz: 29.574 mL. UK fl oz: 28.413 mL. Used for liquid volumes.
Different from weight ounce.
How many pints in a gallon?
8 pints per gallon (both US and UK). But US pint = 473 mL, UK pint
= 568 mL.
What is a barrel?
US petroleum barrel: 42 gallons = 159 liters. UK barrel: 36 imp
gal. US dry barrel: 115.6 L. Varies by content.
How do I convert cubic inches to liters?
Divide by 61.024. 1 L = 61.024 in³. 1 in³ = 0.01639 L = 16.39 mL.
What is a cord of firewood?
128 cubic feet = 3.625 m³. Stack 4 ft × 4 ft × 8 ft. "Face cord"
is smaller (1/3 cord).
How many tablespoons in a cup?
16 tablespoons = 1 US cup. 48 teaspoons = 1 cup. Metric: 16.67
tbsp per metric cup (250 mL ÷ 15 mL).
What is an acre-foot?
~325,851 gallons = 1,233.48 m³. Volume to cover 1 acre with 1 foot
of water. Used for irrigation/reservoirs.
How accurate is this volume converter?
Uses precise conversion factors from international standards.
Accurate for all practical applications.