What in Japanese: Nande, Nani, Nandesuka, and Nandayo

If you are a fan of Japanese culture or are learning the language, you have certainly come across several expressions that seem to mean the same thing: "What?". Phrases like:

• Nani? (何？)
• Nande? (なんで？)
• Nandesuka? (何ですか？)
• Nandayo? (なんだよ？)
• Nanda? (何だ？)

All of these expressions stem from the exact same kanji, 何, but each one carries a distinct level of politeness, emotional tone, or grammatical function. In this guide, we explore the nuances of these common Japanese question words so you can use them naturally and appropriately in conversation.

For related question patterns, explore our guide on naze, doushite, and nande to see how Japanese speakers ask "why".

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The ideogram 何 (nani)

The kanji 何 means "what", but it also appears in questions asking "how many", "which", or "what kind". The critical factor in deciding how to use each expression lies in the particles and auxiliary verbs attached to it, which establish the formality and nuance of your sentence.

In standard polite conversation with colleagues, acquaintances, or teachers, the safe and natural way to ask "what is it?" is nandesuka (何ですか). In informal settings among close peers, speakers often shorten this simply to nani (何), which can express spontaneous surprise, curiosity, or a casual conversational cue.

"Nanda", "Nandayo" and their nuances

Nanda (何だ) combines the kanji 何 with the plain copula da (だ). It serves as the casual counterpart to the polite nan desu ka. To understand the copula system in depth, see our explanation of desu and da in Japanese. When spoken with rising intonation, nanda acts as a direct question: "What is it?" When spoken with a falling tone, it often expresses sudden realization or disappointment, roughly equivalent to "Oh, is that all?"

Adding the assertive particle yo (よ) produces nandayo (何だよ). This phrase is emotionally charged, blunt, and informal. Depending on the speaker's vocal tone and facial expression, nandayo can convey intense surprise ("What in the world?!"), exasperation, or outright annoyance ("What do you want from me?"). In casual feminine speech, women frequently use naniyo (何よ) with a comparable tone of mild irritation or informal challenge.

Speakers also combine these forms with the particle ne (ね) in expressions such as nandayone (何だよね), where the final particle invites agreement or confirms a shared thought. While the question particle ka (か) marks formal questions, casual speech relies heavily on pitch and rising intonation rather than overt particles.

"Nande" and other ways to ask "why"

When the particle de (で) attaches to 何, the word becomes nande (何で). Although it is written with the kanji for "what", nande overwhelmingly functions in daily conversation as a casual way to ask "why?" or "for what reason?". In specific contexts, it can also ask "by what means?", such as asking what transportation someone used.

Besides nande, Japanese provides two other primary ways to ask "why": doushite (どうして), which is moderately polite and versatile, and naze (なぜ / 何故), which is more formal, analytical, and common in written texts.

When combined with the particle mo (も), as in nanimo (何も), the term works in tandem with negative verbs to mean "nothing" or "not anything" (for example, nanimo nai, meaning "there is nothing"). It is important not to confuse nanimo with daremo (誰も), which refers to people ("no one" or "anyone").

Example sentences involving nande, nani, and nanda

Examining these words in authentic sentences helps clarify their practical usage and conversational rhythm. Notice how each expression adapts to its surrounding context:

欲しいのは君だけなんだ。
Hoshī no wa kimi dake nanda.

You are the only one I want.

要するに君は私が嫌いなんだね。
Yōsuruni kimi wa watashi ga kirai nandane.

In short, you dislike me, don't you?

俺この件に関してノータッチなんで
Ore kono-ken ni kanshite nōtatchi nande

I am completely hands-off regarding this matter.

In the sentence above, notice that nande is not the interrogative "why". It represents the spoken contraction of the explanatory conjunction ~nan de (derived from ~na no de), meaning "since" or "because". Recognizing whether nande functions as a question word or a causal connective is an essential skill in Japanese listening comprehension.

本日のランチの内容はなんですか。
Honjitsu no ranchi no naiyō wa nandesuka.

What is included in today's lunch special?

これは何ですか
Kore wa nandesuka

What is this?

本当？なぜ？
Hontō? Naze?

Really? Why?

どうして月は夜輝くのか
Dōshite tsuki wa yoru kagayaku no ka

Why does the moon shine at night?

何でそんな安っぽいペテンにひっかかるんだ。
Nande son'na yasuppoi peten ni hikkakaru nda.

Why would anyone fall for such a cheap trick?

欲しいものは何でも持っていきなさい。
Hoshī mono wa nandemo motte iki nasai.

Take whatever you want.

How to know if the reading of 何 is Nan or Nani

The kanji 何 possesses two primary readings in modern Japanese: nan and nani. Learners often ask how to predict which reading to use. While Japanese orthography includes complex historical exceptions, everyday speech follows a reliable phonological rule based on the sound that follows the kanji.

The reading shifts to nan whenever the subsequent sound begins with an alveolar or dental consonant, specifically sounds in the t, d, or n rows of the Japanese syllabary. Pronouncing nan before these consonants allows the tongue to remain in the same mouth position, creating natural phonetic flow. Common examples include:

• Nanno (何の - of what / what kind of)
• Nandesuka (何ですか - what is it)
• Nande (何で - why / by what means)
• Nanto (何と - what / how)

In contrast, the kanji retains the reading nani when it stands alone as an exclamation (Nani?!) or when followed directly by case particles such as ga (が), o (を), and mo (も). In compound nouns, the reading depends on established convention. For example, 何色 is commonly read as nani-iro when asking about a color, whereas 何語 can be read as nanigo or nango to ask what language is being spoken.

Furthermore, whenever 何 precedes a numerical counter, the reading is consistently nan. Examples include nannin (何人, how many people), nankai (何回, how many times), nandai (何台, how many machines or vehicles), and nanmai (何枚, how many flat sheets). A notable counter exception is nanyoubi (何曜日, what day of the week), which maintains the nani stem.

Using 何 to ask what or how many with counters

The kanji 何 combines with various grammatical counters to ask specific questions about quantity, time, dates, and objects:

Meaning	Japanese	Romaji
How old?	何歳ですか?	nansaidesuka
What number?	何番	nanban
What day of the week?	何曜日	nanyoubi
What day / How many days?	何日	nannichi
What language?	何語	nango
How many minutes?	何分	nanpun
How many people?	何人	nannin
How many times?	何回	nankai
How many machines / vehicles?	何台	nandai
How many flat objects / sheets?	何枚	nanmai

Other words derived from the kanji 何

Many essential Japanese question words and indefinite pronouns originate from the kanji 何. The following reference table brings together the most frequent vocabulary items derived from this versatile ideogram:

Meaning	Japanese	Romaji
Where / Which place	何処	doko
Why / For what reason	何故	naze
Nothing (with negative verb)	何も	nanimo
Why / By what means	何で	nande
When / At what time	何時	itsu
What / How (adverbial)	何と	nanto
How / What (exclamatory)	何て	nante
Which way / Who (polite)	何方	dochira
Which one / Any	何れ	dore / izure
Something	何か	nanika
Anything / Whatever	何でも	nandemo
Somehow / Something	何とか	nantoka
How many times	何回	nankai
How many times / degrees	何度	nando
For some reason	何やら	nanyara
What time	何時	nanji
Anywhere / Everywhere	何処までも	dokomademo
What kind of person / monster	何者	nanimono
Let me see / Which one	何れ何れ	doredore
Various things / What-not	何々	naninani
It is nothing / No problem	何でもない	nandemonai
Until when	何時まで	itsumade
Everything / All sorts of things	何もかも	nanimokamo
In any case / At any rate	何せ	nanise

Practical summary: choosing the right word

Navigating the various forms of 何 becomes straightforward once you remember three fundamental principles:

First, match your politeness to the social setting. Rely on nan desu ka for everyday polite exchanges, switch to nani or nanda with close friends, and reserve nandayo for moments of genuine surprise or informal emphasis where strong emotion is warranted.

Second, listen for the following sound when deciding between nan and nani. If the next syllable starts with t, d, or n, or if you are attaching a numeric counter, the pronunciation naturally shifts to nan. Before particles like ga and o, or when the word stands alone, use nani.

Third, pay close attention to sentence position when hearing the word nande. At the start of a question, it asks "why?" or "how?". At the end of a casual statement, it often represents the contracted connective ~nan de, explaining the reason for an action rather than asking a question. Keeping these distinctions in mind will make your spoken Japanese clearer, more accurate, and far more natural.