Окей, договорились.

Договорились comes from the verb договориться, which means to come to an agreement, to arrange something, or to reach an understanding.

Literally, договорились is the past tense plural form, so word-for-word it is something like:

we agreed / we came to an agreement

In actual conversation, Russian often uses this form by itself as a set phrase meaning:

• Agreed
• Deal
• It’s settled
• We have an agreement

So in Окей, договорились, the second word is not just describing the past; it is functioning like a natural conversational response: Okay, agreed.

This is a very common question, because Russian and English package this idea differently.

The ending -лись shows:

• -л- = past tense
• -и = plural
• -сь = reflexive ending

So договорились literally means we agreed.

Russian often uses this form when two or more people have reached an agreement. Even when the subject we is not said, it is understood from the verb form.

So:

• Договорились. = We agreed / Agreed / Deal.

English often uses a shorter expression like deal or agreed, but Russian prefers the full verb form here.

The dictionary form is договориться.

A useful breakdown is:

• говорить = to speak
• договориться = to come to an agreement, to arrange, to settle something by discussion

This verb is perfective, meaning it focuses on the result: the agreement has been reached.

That is why договорились works so well for Okay, agreed: it emphasizes that the matter is now settled.

The -ся (or -сь after a vowel) is the reflexive marker.

In many verbs, it does not translate directly as oneself in English. Instead, it often changes the meaning of the verb in an idiomatic way.

Here:

• договорить can mean to finish speaking or to say to the end
• договориться means to come to an agreement

So the reflexive form creates a different verb with its own meaning.

In договорились, the -сь is just the form used after the vowel at the end of the past-tense plural ending.

Окей is a borrowing from English okay / OK. It is very common in modern spoken Russian, especially in informal speech.

It sounds natural in many everyday contexts, especially among younger speakers or in casual conversation.

However, depending on tone and situation, Russians also often say:

• Хорошо = okay, good
• Ладно = okay, all right
• Договорились by itself = agreed, deal

So Окей, договорились is natural, but it is definitely more conversational than formal.

It is mostly informal to neutral conversational speech.

You can use it with:

• friends
• coworkers in casual conversation
• chats and messages
• everyday arrangements

In a more formal setting, people might prefer something like:

• Хорошо, договорились.
• Хорошо, мы договорились.
• Согласен / Согласна.
• Отлично, тогда так и сделаем.

So Окей, договорились is natural, but it has a relaxed spoken tone.

Yes, very often.

Just Договорились! is an extremely common response and can mean:

• Agreed!
• Deal!
• It’s settled!
• Okay, we’ll do that.

For example:

• Встретимся в шесть? — Договорились.
  Shall we meet at six? — Agreed.

Adding Окей just makes it a little more conversational or emphatic:

• Окей, договорились.

A practical pronunciation guide is:

Окей, договорились
a-KYEY, da-ga-va-REE-lis'

A few notes:

• Окей sounds close to English okay, but with Russian pronunciation.
• In договорились, unstressed о is pronounced more like a.
• The stress is on -ри-: договорИлись.

A more careful stress marking version is:

окЕй, договорИлись

The comma separates two short conversational elements:

• Окей = an introductory response like okay
• договорились = the main statement, agreed / it’s settled

In writing, this comma is natural because the speaker first signals acceptance, then confirms the agreement.

In casual texting, people may also write:

• Окей договорились
• Окей. Договорились.

But the version with the comma is perfectly standard and natural.

Yes, absolutely.

These are all natural, but they have slightly different tones:

• Окей, договорились. = casual, modern, a bit influenced by English
• Хорошо, договорились. = neutral, very common
• Ладно, договорились. = conversational, sometimes slightly more like all right then, agreed

So if you want the safest all-purpose option, Хорошо, договорились is excellent.
If you want something casual and very natural in modern speech, Окей, договорились also works well.

Use договорились when the idea is we have settled the arrangement.

Use согласен or согласна when the idea is more simply I agree.

Compare:

• Встретимся завтра в три? — Договорились.
  This sounds like: Okay, it’s arranged.

• Ты согласен? — Да, согласен.
  This means: Do you agree? — Yes, I agree.

So договорились often feels more like a completed arrangement between people, not just personal agreement.

Yes, one person can definitely say it.

Even though the verb form literally means we agreed, one speaker commonly uses it because the agreement involves both sides. Russian is expressing the shared result, not just the speaker’s individual action.

So one person can say:

• Хорошо, договорились.
• Окей, договорились.

and it naturally means:

• Okay, agreed.
• Deal.

This is completely normal and very common.