Let's start with some good news:
In plural you don’t have to decide between masculine, feminine, or neuter anymore: THERE IS ONLY ONE FORM, regardless of the gender.
Now the bad news:
There are different plural endings you have to decide between: "-n/-en," "-r/-er," "-e," and "-s." There is even the possibility that the noun doesn’t change at all and you just have to change the article.
And once again: there is no universal rule that works in all cases.
Write the plural form together with the noun on another line in your vocabulary list. Use my sample list!
Masculine nouns that end in "-ent," "-ant," "-and," "-or," "-ist":
Feminine nouns that end in "-in," "-ion," "-ik," "-ung," "-tät," "-schaft," "-keit," "-heit":
99% of all nouns that end in "-e":
For nouns that end in "-in," the "n" is doubled.
Example: „die Kellnerin“ – „die Kellnerinnen“
Many masculine nouns:
Many one-syllable feminine nouns:
For feminine nouns with a, o, u, always add an umlaut (ä, ö, ü).
For masculine nouns, usually add an umlaut (but not always).
Many neuter, one-syllable nouns:
An umlaut is usually added.
Feminine nouns NEVER form the plural with "r" or "er."
All nouns that end in a, i, o, u, or y:
Many foreign words:
If we don’t add an ending, then an umlaut is usually required for the letters a, o, and u.
Masculine and neuter words with the endings "-el," "-er," and "en":
Feminine nouns ending with "-el" form their plural with "n."
Example: Die Kartoffel - die Kartoffeln
Words taken from English usually end in "s" in the plural form.
Words taken from Latin or Greek often have a special form:
Some words can’t have a plural form. They have a singular form only:
In these cases, the singular word already talks about a group of something or is uncountable (Be careful, because uncountable nouns in English are not always uncountable in German).
Some words can’t have a singular form. They only have a plural form:
Those words can’t have a singular form due to their meaning.
An introduction to German nouns and gender.
To many rules for you? Guess 75% of all article correctly with my article trick.
What articles are there in German? Articles.
How do the articles change based on the case the noun is in? More about German cases.
Some masculine nouns get an extra "-n"-ending in accusative, dative, and genitive. It's called n-declension.