Lo hablamos con calma.

Lo is a direct object pronoun. It means it or that, referring to something already known from the conversation.

So in Lo hablamos con calma, lo stands for the thing / issue / matter you are going to talk about.

For example:

• ¿Qué hacemos con este problema? — Lo hablamos con calma.
• What do we do about this problem? — We’ll talk it through calmly.

Not always.

Although lo is often taught as the masculine singular direct object pronoun, it can also refer more loosely to an idea, situation, plan, or issue rather than a specific masculine noun.

That is very common in sentences like:

• No lo sé = I don’t know
• Ya lo veremos = We’ll see
• Lo hablamos mañana = We’ll talk about it tomorrow

So here, lo does not necessarily mean there is a masculine noun hidden somewhere. It can simply mean that matter or that issue.

Because in Spanish, unstressed object pronouns like lo, la, los, las, me, te, nos usually go before a conjugated verb.

So:

• Lo hablamos = correct
• Hablamos lo = not natural/correct in standard Spanish

This is a basic word-order rule in Spanish.

Because hablamos is a fully conjugated verb, and with conjugated verbs, object pronouns normally go before the verb.

You attach pronouns only in certain cases, especially with:

• infinitives: hablarlo
• gerunds: hablándolo
• affirmative commands: háblalo

Compare:

• Lo hablamos ahora.
• Vamos a hablarlo ahora.
• Estamos hablándolo.
• Háblalo con ella.

So lo hablamos is exactly what you expect with a normal conjugated verb.

Hablamos is the 1st person plural form of hablar:

• we talk
• we are talking
• sometimes we will talk, depending on context

The ending -amos tells you the subject is we.

That is why Spanish does not need to say nosotros here. The verb ending already shows it.

Yes. This is an important point.

For -ar verbs, hablamos can be:

• present: we talk / we are talking
• preterite: we talked

So the form is ambiguous by itself. Context tells you which meaning is intended.

For example:

• Ahora no, lo hablamos con calma luego.
  → present with a future idea: we’ll talk about it later
• Ayer lo hablamos con calma.
  → past: we talked about it calmly yesterday

This is a very good question, because learners are often first taught hablar de = to talk about.

In everyday Spanish, especially in Spain, hablar is also often used transitively to mean something like:

• discuss
• talk through
• go over

So:

• Lo hablamos = We’ll discuss it / talk it through
• Hablamos de eso = We talk about that

Both can be possible, but they are not always identical in feel.

A useful difference:

• hablar de algo = simply talk about something
• hablar algo / hablarlo = often sounds more like deal with that topic directly, discuss it, or sort it out by talking

So Lo hablamos con calma feels very natural as We’ll talk it through calmly / We’ll discuss it properly.

Con calma literally means with calm, but in natural English it usually means something like:

• calmly
• without rushing
• when we have time
• properly / carefully / at ease

It often refers not just to the tone of voice, but to the way the conversation will happen: unhurried, relaxed, with time to think.

So Lo hablamos con calma often suggests:

• Let’s not rush this
• We’ll discuss it properly
• We’ll talk about it when things are calmer

Because con calma is a very common fixed expression.

Spanish often uses con + noun without an article in adverb-like expressions:

• con calma = calmly / unhurriedly
• con cuidado = carefully
• con paciencia = patiently
• con respeto = respectfully

So con calma is the normal phrasing.

Con la calma is possible in other contexts, but it would usually mean something more literal or specific, not this standard expression.

Yes. Very often.

Spanish frequently uses the present tense for a near future or a planned future action.

So Lo hablamos con calma can naturally mean:

• We’ll talk about it calmly
• We’ll talk about it later, when we can do it properly
• Let’s discuss it when things are calmer

This is especially common in conversational Spanish.

Yes, but normally you would not say nosotros unless you want emphasis or contrast.

The neutral, natural version is:

• Lo hablamos con calma.

If you say:

• Nosotros lo hablamos con calma

it sounds more like:

• We’ll talk about it calmly
  (as opposed to someone else)
• We are the ones who will discuss it

So the subject pronoun is usually omitted unless it adds something.

Yes. Spanish word order is flexible, and changing it can shift the emphasis.

• Lo hablamos con calma = the most neutral order
• Con calma lo hablamos = puts extra focus on con calma
• Lo hablamos mañana con calma = adds time information
• Eso lo hablamos con calma = adds emphasis to that

So the original sentence is the most straightforward version, but other orders are possible depending on what the speaker wants to highlight.