What does tankful mean?
A tankful is a quantity of liquid equal to what a tank can hold. The expression is particularly useful when discussing petrol, water, oil, or other substances stored or carried in tanks, allowing a quantity to be described in practical terms rather than abstract measurements. “One tankful of fuel” or “a full tankful of water” are natural collocations. The word is somewhat more common in British English than in American English, but it is readily understood wherever English is spoken. Although it can refer formally to a tank’s capacity, its everyday use often concerns fuel and travel, such as estimating how many miles a vehicle can travel on a tankful. The compound combines the familiar container word “tank” with the fullness suffix “-ful,” making its meaning transparent.
nounAn amount equal to the capacity of a tank, especially a fuel tank or water tank.
- An amount equal to the capacity of a tank.
"The car can travel roughly 400 miles on a full tankful of petrol."
"The motorboat used a tankful of fuel to cross the lake."
"We carried several tankfuls of water to the allotment."
The plural is used when referring to multiple measured quantities of liquid.
"The station sold three tankfuls of fuel during the power cut."
A tankful turns an abstract quantity into a practical one: enough fuel to fill the tank, or enough water to fill a tank.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does tankful come from?
The word is a compound of “tank” and the Old English-derived suffix “-ful,” meaning “full” or “the quantity that fills.” The word “tank” entered English in the 16th century for a vessel or reservoir, especially one used to hold water or other liquids; its precise source is debated. “Tankful” developed later as a measure of a tank’s contents, following the common English pattern of words such as “mouthful” and “handful.”
Related word forms
How tankful is actually used
The word is relatively uncommon in formal writing but is natural in practical contexts involving fuel, water, or other liquids. It is especially associated with British English, although it is also understood in American English.
Easily confused with tankful
A tankful is the amount a tank can hold, whereas a tank is the container itself or a vehicle equipped with one.
A tanker is a vehicle or vessel designed to transport liquid, whereas a tankful is merely a measured quantity.