watasi ha heiki desu.

It is read:

わたし は へいき です。
Watashi wa heiki desu.

A natural English pronunciation guide would be something like:

• wa-ta-shi
• wa
• hay-kee
• dess / des

A couple of notes:

• 私 = わたし / watashi
• The particle は is written ha but pronounced wa here.
• です is often pronounced softly, and the final u is usually very light or almost inaudible in careful standard Japanese.

Because in this sentence, は is not being used as a normal syllable inside a word. It is being used as the topic particle.

As a particle:

• は is written は
• but pronounced わ

So:

• 私は = わたしは / watashi wa

This is one of the first spelling-pronunciation mismatches learners meet in Japanese, and it is completely normal.

は marks the topic of the sentence.

So 私は平気です literally feels like:

• As for me, I’m fine / okay.

This is slightly different from an English subject marker. Japanese often sets up a topic first, then says something about it.

So:

• 私 = I / me
• は = as for
• 平気 = fine, okay, unfazed, all right
• です = polite sentence ending / copula

A very literal breakdown would be:

As for me, [I am] fine.

平気 usually means something like:

• fine
• okay
• all right
• not bothered
• not affected
• no problem

It often has a nuance of:

• I’m okay
• It doesn’t bother me
• I can handle it
• I’m not hurt / worried / troubled

So 私は平気です can mean more than just general wellness. Depending on context, it could mean:

• I’m fine.
• I’m okay.
• It’s no problem for me.
• I’m not bothered by it.

That nuance is important. 平気 is often used when someone is concerned about you, or when something difficult/painful/inconvenient is being discussed.

This is a very common question.

元気です

Usually means:

• I’m well
• I’m healthy
• I’m doing well
• I have energy

It is often used in greetings:

• お元気ですか。 = How are you?

平気です

Usually means:

• I’m fine
• I’m okay
• No problem
• It doesn’t bother me
• I can handle it

So the difference is:

• 元気 is more about health, energy, general condition
• 平気 is more about being okay in a situation or not being troubled

For example:

• If someone asks whether you are healthy after being sick, 元気です may fit.
• If someone asks whether you are hurt, worried, scared, or inconvenienced, 平気です is often better.

Yes, very often you can just say 平気です.

Japanese frequently omits words that are clear from context, especially pronouns like 私.

So if someone asks you:

• 大丈夫ですか。 = Are you okay?

A very natural reply is simply:

• 平気です。 = I’m fine.

Using 私は can add emphasis or contrast, such as:

• 私は平気です。 = I’m fine. / As for me, I’m fine.

That can sound like:

• I’m okay, at least
• I’m fine, though maybe someone else isn’t
• Me? I’m fine

So in many everyday situations, 平気です is more natural unless you specifically want to mention I.

です makes the sentence polite and complete.

In a sentence like this, it works somewhat like is/am/are, but it is not always a perfect one-to-one match with English to be.

Here:

• 平気 is the main descriptive word
• です makes it polite: 平気です

Compare:

• 平気。 = casual, plain, often used in conversation
• 平気です。 = polite
• 平気だ。 = plain form, less polite, often used in informal speech or writing

So です is one of the standard polite endings beginners learn early.

Yes, it is grammatical and natural, but whether it sounds natural depends on context.

It is especially natural when:

• someone is worried about you
• you want to reassure someone
• something unpleasant happened and you want to say you are okay
• you want to say something does not bother you

Examples of natural situations:

• After a small accident: 私は平気です。
• If someone asks whether the cold, pain, or inconvenience is okay for you: 私は平気です。

However, if you are just introducing your general condition in a neutral way, 元気です might be more natural than 平気です.

So the sentence is natural, but 平気 has a situational nuance.

Sometimes, yes, depending on context.

In English, I’m good can mean:

• I’m fine
• No thank you
• I don’t need anything

Japanese 平気です can similarly be used to mean:

• I’m okay
• No, I’m fine
• That’s okay, I don’t need it

For example, if someone offers help:

• 手伝いましょうか。 = Shall I help?
• 平気です。 = I’m okay / I’m fine.

But context matters a lot. In some situations, 大丈夫です is even more common for this kind of I’m okay / no thanks meaning.

These two are close, and learners often confuse them.

大丈夫です

Can mean:

• It’s okay
• I’m okay
• No problem
• No thanks
• It’s safe / acceptable

It is extremely common and versatile.

平気です

Also means:

• I’m fine
• I’m okay
• It doesn’t bother me
• I can handle it

But 平気 often has a slightly stronger nuance of:

• I’m not affected
• I’m unfazed
• It doesn’t trouble me

So:

• 大丈夫です is broader and very commonly used
• 平気です can sound a bit more specifically like I’m fine / it doesn’t bother me

In many situations they overlap, but they are not always identical.

Yes, but it is very normal Japanese word order.

The sentence follows a common pattern:

topic + description + polite ending

So:

• 私 = topic noun
• は = topic marker
• 平気 = description
• です = polite ending

Japanese usually puts the main predicate near the end of the sentence, unlike English.

That is why the sentence does not literally match English word-for-word order. A literal structure is more like:

• As for me, fine am

Of course, the natural English translation is simply:

• I’m fine.

Yes.

私 / わたし / watashi is a standard polite way to say I, and both men and women can use it.

A few helpful notes:

• In polite situations, 私 is normal for everyone.
• In casual speech, men often use other pronouns such as 僕 or 俺.
• Women may still use 私 in both polite and casual speech, depending on style.

So 私は平気です is a safe, polite sentence regardless of gender.

A casual version is often:

• 私は平気。
• or just 平気。

You might also hear:

• 平気だ。
• 俺は平気だ。
• 僕は平気。

depending on the speaker and situation.

In everyday casual conversation, pronouns are often dropped, so 平気。 is very common if the context already makes it clear who is being talked about.

The polite version 私は平気です is safer for learners to use in general.