Why convert volume units?

Volume measures 3D space – the amount of substance a container holds or an object takes up. Different units are used in different contexts: liters for drinks and gasoline (most of the world), gallons for fuel (US), cubic meters for cargo and pools, cubic feet for refrigerators and HVAC, fluid ounces for cooking and beverages (US), milliliters for medicine and small portions, cups/tablespoons/teaspoons for cooking. Volume conversion is essential when: cooking recipes from different countries (US cup vs UK cup vs Indian cup are different!), fueling abroad (gallon vs liter), measuring medical dosages, calculating shipping costs (m³), DIY home projects, or comparing product sizes. This converter handles 10+ common volume units, including the often-confused US vs UK gallons.

How to use this tool

1. Enter value — The volume amount to convert. Decimals supported.
2. Select ‘from’ unit — Liters, ml, m³, cm³, US gallons, UK gallons, US quarts/pints/cups/fluid ounces, US tablespoons/teaspoons, cubic feet.
3. Read all conversions — Every other unit shows equivalent. Visually compare 1 cup (240 ml) to 1 cup (236.6 ml US) to UK pint (568 ml) – immediately see the differences.

Volume conversion factors

All conversions via liter (L) base:

• 1 L = 0.001 m³ = 1000 ml = 0.001 m³ = 1000 cm³
• 1 US gallon = 3.78541 L (smaller than UK)
• 1 UK / imperial gallon = 4.54609 L (~20% bigger than US)
• 1 US quart = 0.946353 L (1/4 of US gallon)
• 1 US pint = 0.473176 L (1/2 of quart)
• 1 US cup = 0.236588 L (about 1/2 pint)
• 1 US fluid ounce (fl oz) = 0.0295735 L = ~30 ml
• 1 US tablespoon (tbsp) = 0.0147868 L = ~15 ml
• 1 US teaspoon (tsp) = 0.00492892 L = ~5 ml
• 1 cubic foot (ft³) = 0.0283168 L = 28.32 L

Cooking conversions:

• 1 cup (metric) = 250 ml (Australian standard) – different from US 236.6 ml
• 1 tablespoon = 15 ml = 3 teaspoons
• 1 teaspoon = 5 ml
• 4 cups = 1 quart (US)
• 4 quarts = 1 gallon (US)

Examples

• 500 ml water bottle: 0.5 L, 16.91 US fl oz, 1.06 US pint
• 1 US gallon gas tank: 3.785 L, 3.331 UK gallon (notice difference!)
• 2 cups flour (US): 473.2 ml, 16 US fl oz
• 30 ml medicine spoon: 1.01 US fl oz, 2.03 US tbsp
• 1 m³ shipping container box: 1000 L, 264 US gallons, 35.31 ft³
• Tablespoon of olive oil: 15 ml, 0.5 US fl oz
• Olympic pool (50m x 25m x 2m = 2,500 m³): 2.5 million L, 660,000 US gallons

Tips & best practices

• 1 US fluid ounce ≈ 30 ml (close enough for cooking) – exact is 29.57 ml
• US gallon (3.79 L) is smaller than UK / imperial gallon (4.55 L) – 20% difference! Always specify which
• For recipes from different countries, use the same unit consistently or convert all to metric (ml/L)
• Tablespoon (tbsp) and teaspoon (tsp) are universal kitchen units: 1 tbsp = 3 tsp = 15 ml
• Indian cooking ‘cup’ is often 240 ml (metric standard), not exactly US 236.6 ml – close enough for most recipes
• For fuel economy, MPG (miles per US gallon) and km/L are different – 30 MPG ≈ 12.75 km/L
• For shipping, volume in m³ matters – small dense items pay by weight, large light items pay by volume

Limitations & notes

Doesn’t include obscure volume units (bushels, hogsheads, drams) used in specific industries. For dry vs liquid measure differences (US dry pint = 0.551 L vs liquid pint = 0.473 L), the tool uses liquid measure as default. Indian cooking ‘glass’ (200-250 ml) and ‘katori’ (small bowl, 100-150 ml) are colloquial – not exact. For exact measurements, use kitchen scales (weight-based, more accurate than volume).

Frequently Asked Questions

Why is US gallon different from UK gallon?

US uses ‘Queen Anne’s gallon’ (defined 1707, 231 cubic inches = 3.785 L) which became the US standard. UK adopted ‘Imperial gallon’ in 1824 (4.546 L = 10 lb of water). The 20% difference catches many people off-guard. US uses Queen Anne, rest of world (including former UK colonies) typically uses imperial. Specify which gallon!

Is 1 cup always 240 ml?

No – depends on country. US legal cup = 236.6 ml. Australian metric cup = 250 ml. UK imperial cup = 284 ml (now rare). Coffee mug = anywhere 200-400 ml. For recipes, ‘cup’ usually means 236-250 ml; minor variations matter little for most cooking.

How big is a ‘glass’ in volume?

Varies: shot glass = 30-45 ml. Water glass = 250-350 ml. Wine glass = 150-200 ml (for serving). Beer pint = 568 ml (UK) or 473 ml (US). Generally ‘glass’ isn’t precise enough for cooking – use ml or cup.

Why is volume different from weight?

Volume = space, weight = mass (under gravity). 1 L of water = 1 kg (by definition). 1 L of oil = ~920 g (lighter). 1 L of honey = ~1.4 kg (heavier). Volume-weight conversion needs density. For cooking, weighing (with kitchen scale) is more accurate than volume measure.

How do I convert cubic feet to liters?

1 ft³ = 28.32 L. Multiply ft³ by 28.32 to get L. Useful for refrigerator sizes (US uses ft³ but liters more intuitive), HVAC airflow, lumber volumes.

What’s the difference between fluid ounce and weight ounce?

Different things. Fluid ounce (fl oz) = volume = 29.57 ml. Weight ounce (oz) = mass = 28.35 g. For water they happen to be similar (1 fl oz water weighs ~1 oz) but different units. For oil or denser liquids, they differ significantly.

Why are recipes from India sometimes in ‘glasses’ and ‘cups’?

Indian recipes traditionally used common household items as references – ‘one glass’ (~200 ml), ‘one cup’ (~240 ml), ‘one katori’ (~100 ml). Less precise than ml but practical. Modern Indian cookbooks increasingly use ml and grams for precision.

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