Ukihesabu vitabu vyote kwenye meza, utajua idadi kamili.

Ukihesabu comes from the verb kuhesabu, meaning to count.

It breaks down like this:

• u- = you (singular)
• -ki- = if/when
• -hesabu = count

So ukihesabu means if you count or when you count.

It can mean either, depending on context.

In Swahili, -ki- often introduces a condition or a time relationship:

• if you count...
• when you count...

In this sentence, both make sense in English:

• If you count all the books on the table, you will know the exact number.
• When you count all the books on the table, you will know the exact number.

So the Swahili form is a little broader than a single English word.

Because Swahili usually puts the subject inside the verb.

For example:

• u-ki-hesabu = you if/when count
• u-ta-jua = you will know

The u- already tells you the subject is you singular.
You only add the separate pronoun wewe if you want emphasis, such as:

• Wewe ukihesabu vitabu vyote, utajua idadi kamili.

That would sound like You, if you count all the books, you will know the exact number.

Because utajua contains the future marker.

It breaks down like this:

• u- = you (singular)
• -ta- = future tense
• -jua = know

So:

• utajua = you will know

This matches the idea that the knowing happens after the counting.

Because Swahili words that describe nouns often have to agree with the noun class.

Vitabu is the plural of kitabu:

• kitabu = book
• vitabu = books

This noun belongs to the ki-/vi- class in singular/plural, so all must match that class:

• kitabu chote = the whole book / every book
• vitabu vyote = all the books

So vyote agrees with vitabu.
Using yote here would be incorrect.

Vyote means all of them or all, but specifically for nouns in the vi- plural class.

It comes from the stem -ote, meaning all / whole / every, and it changes form to match the noun class.

Examples:

• vitabu vyote = all the books
• vitu vyote = all the things
• vyote by itself can mean all of them, if the noun is already understood

So in this sentence, vitabu vyote means all the books.

Kwenye meza means something like on the table, at the table, or in/on the table area, depending on context.

In this sentence, it is naturally understood as on the table.

You could also say juu ya meza, which more specifically emphasizes on top of the table surface.

So the difference is roughly:

• kwenye meza = on/at the table
• juu ya meza = on top of the table

Both can work, but kwenye meza is very natural in everyday Swahili.

Literally:

• idadi = number, quantity, count
• kamili = complete, full, exact

So idadi kamili means the complete number, the full total, or the exact count.

In natural English, you might translate it as:

• the exact number
• the total number
• the complete count

Because Swahili does not have articles like a, an, and the.

That means nouns like vitabu and meza do not change form to show definiteness.

So:

• vitabu can mean books or the books
• meza can mean a table or the table

The exact meaning comes from context.
Here, the context makes the books and the table the most natural English translation.

It is talking to one person, because the subject marker is u-.

So:

• ukihesabu = if/when you (singular) count
• utajua = you (singular) will know

If you were speaking to more than one person, you would use m-:

• Mkihesabu vitabu vyote kwenye meza, mtajua idadi kamili.

That means If you all count all the books on the table, you will know the exact number.

Yes, to some extent.

The given sentence starts with the condition:

• Ukihesabu vitabu vyote kwenye meza, utajua idadi kamili.

That is very natural.

You could also say:

• Utajua idadi kamili ukihesabu vitabu vyote kwenye meza.

This still makes sense, but it puts the result first and the condition second.

So the original order is common and clear, especially for if/when sentences.

Usually, you do not need the object marker when the object noun is stated right after the verb.

So the normal straightforward form is:

• ukihesabu vitabu vyote

Here, vitabu vyote is already the object, so nothing extra is needed.

A form like ukivihesabu vitabu vyote is possible in some contexts for emphasis or when referring back to something already known, but it is less neutral and more marked.

For most learners, the safest pattern is:

• verb + object noun

So this sentence is perfectly natural as written.