Plural of Torpedo

Our Story
The Quick Answer
The plural of torpedo is torpedoes.

The Plural of Torpedo

The plural of torpedo is torpedoes.
  • During the War of 1812, torpedoes were employed in attempts to destroy British vessels and protect American harbors.
  • Torpedoes can be stored for years without losing performance.
The noun torpedo adheres to the standard rules for forming the plurals of nouns in English (shown in the table below).

Are You Good at Plurals?

Here's a quick test.
Getting ready...

The Standard Rules for Forming the Plurals

The table below shows the standard rules for forming the plurals of nouns in English.
Type Example of Type Forming the Plural Plural
Most Nouns lamp
scythe		 add s lamps
scythes
Noun Ending s, sh, ch, x or z bus
dress		 add es buses
dresses
Nouns ending [consonant] o torpedo
zero
 add either s or es
(There are no rules for this - you have to know.)		 torpedoes
zeros
Nouns ending [vowel] o patio
ratio 		add s patios
ratios
Nouns ending [consonant] y story
penny		 change the y to an i and add es stories
pennies
Nouns ending [vowel] y storey ()
donkey 		add s storeys
donkeys
Nouns ending f or fe dwarf
knife 		ves and/or s
(There are no rules - you have to know.)		 dwarfs
knives
Exceptions man
louse 		some nouns undergo a vowel or letters change men
lice
More exceptions salmon
sheep 		some nouns do not change at all salmon
sheep

Why Is There Confusion over the Plural of Torpedo?

There is confusion because the rule for forming plurals with nouns ending in o isn't straightforward. Most nouns will just add an s. For example:
  • Kangaroo becomes kangaroos.
  • Piano becomes pianos.
Some add es. For example:
  • Embargo becomes embargoes.
  • Echo becomes echoes.
With some words, both versions are accepted. For example:
  • Volcano becomes volcanoes or volcanos.
  • Halo becomes haloes or halos.
The plural of torpedo is always torpedoes. Unfortunately, there is no clever way of knowing which nouns ending o follow which rules. You have to know. (For example, you have to know that torpedo becomes torpedoes, but kangaroo becomes kangaroos.)

Beware

Don't Use an Apostrophe to Form a Plural

Adding 's is never an option when forming the plural of a noun. Despite this simple rule, inexperienced writers often feel compelled to add an apostrophe, especially when the noun ends with a vowel (e.g., piano, tomato, emu). For example:
  • The tomato's were ripe.
  • The tomatoes were ripe.
Read more about apostrophes and plurals.
Read more about using apostrophes.
Another Interactive Exercise
Here are three randomly selected questions from another exercise on plurals, which can be edited, printed to create an exercise worksheet, or sent via email to friends or students.

Help Us To Improve Grammar Monster

  • Do you disagree with something on this page?
  • Did you spot a typo?
Please tell us using this form.

See Also

Unusual pluralsPlural forming table Quirks with forming plurals Forming the plurals of abbreviations Forming the plurals of compound nouns