How Many Liters Are in a US Gallon?

1 US gallon equals 3.78541 liters. Note that the UK imperial gallon is larger, equal to 4.54609 liters.

1 US cup equals 236.588 milliliters. In metric countries, a cup is often rounded to 250 ml.

There are 16 tablespoons in 1 US cup. 1 tablespoon equals 3 teaspoons or approximately 14.79 ml.

1 liter equals approximately 4.227 US cups. This is useful for scaling recipes between metric and US measurements.

1 US pint equals 16 fluid ounces or 473.176 ml. The UK imperial pint is larger at 20 fluid ounces (568 ml).

A typical compact car fuel tank holds 45–55 liters (12–14.5 US gallons). Mid-size sedans typically have 55–65 L (14.5–17 gal) tanks. Large SUVs and trucks can have 80–110 L (21–29 gal) tanks. Electric vehicles do not have fuel tanks but typically have 40–100 kWh battery packs.

A standard bathtub holds about 150–250 liters (40–66 US gallons) when filled to normal bathing depth (about two-thirds full). A full fill to the overflow drain is typically 300–400 liters. Freestanding soaking tubs can hold up to 500 liters.

A modern front-loading washing machine uses 40–60 liters (11–16 US gallons) per cycle. Top-loading machines use more — typically 100–170 liters (26–45 gal). High-efficiency (HE) models use less water per load than standard machines.

A standard wine bottle is 750 ml (0.75 liters), which is about 25.4 fl oz or roughly 5 glasses of wine at a standard 150 ml pour. A magnum is 1.5 liters (2 standard bottles). A half-bottle is 375 ml.

General guidelines suggest about 2–3 liters (8–12 cups) of total fluid per day for adults, including water from food. The US National Academies recommend approximately 3.7 liters for men and 2.7 liters for women from all beverages and foods combined. Individual needs vary by activity level, climate, and health.