Why does koruna change to koruny and korun?

Czech nouns agree with their count. One uses koruna, two to four use koruny, and five or more (and zero) use the genitive plural korun. The same rule gives haléř, haléře, and haléřů for the fractional part. This tool applies all three forms automatically.

How many haléř are in a koruna?

There are 100 haléř (hellers) in one koruna, so the decimal part is treated as hundredths. Coins below one koruna were withdrawn from circulation, but written amounts on invoices and contracts still spell out the haléř for precision.

What forms does the number itself take?

The integer is spelled in full Czech, for example 1234 becomes tisíc dvě stě třicet čtyři. The tool handles units, teens, tens, hundreds, thousands, and millions, including the special words for two (dvě before feminine koruna) and the standalone forms.

Can I use a comma as the decimal separator?

Yes. Czech writing uses a comma as the decimal mark (1 234,56), so the tool accepts both comma and dot. Whichever you type, the part after it is read as haléř, padded or truncated to two digits.

Is this suitable for official invoices?

It produces the standard slovem phrasing used on Czech invoices and contracts, but always proofread the output before sending a legally binding document. The tool covers amounts up to the millions, which suits ordinary commercial use.

Czech Currency in Words

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Czech invoices, contracts, and cheques traditionally repeat the amount in words (slovem) to prevent tampering. Doing this correctly means spelling the number in full Czech and then choosing the right form of koruna and haléř according to the count.

How it works

The amount is split into whole korun and hundredths (haléř). Each part is spelled out, then the currency noun agrees using the Czech 1/2-4/5+ rule:

1            → koruna   / haléř     (singular)
2, 3, 4      → koruny   / haléře    (nominative plural)
0, 5, 6, …   → korun    / haléřů    (genitive plural)

The number itself is built from units, tens, hundreds, and thousand/million groups, using dvě before the feminine noun koruna and the standalone Czech words for each magnitude.

Example and tips

1234,56 Kč becomes tisíc dvě stě třicet čtyři koruny padesát šest haléřů. Note how 34 korun would take korun (genitive plural) but 1234 ends in …34 and the agreement still follows the whole number’s final value — Czech keys off the full quantity. Enter amounts with up to two decimal places; extra digits are rounded to the nearest haléř. Always proofread before using the text on a binding document.