# USD to CZK converter

Converts US dollar (USD) to Czech koruna (CZK) and back at the ECB euro reference rates of 28 September 2026, or at your own rate.

- Page: https://www.acalculator.org/convert/usd-to-czk
- JSON spec: https://www.acalculator.org/convert/usd-to-czk.json
- Version: 3dde94731380

## Default answer

Example with the default inputs (US dollar (USD) 1, Rate: CZK per 1 USD 21.4423): 1 USD = 21.44 CZK, at 1 USD = 21.4423 CZK. The ECB reference rates of 28 September 2026 give 1 USD = 21.4423 CZK.

## Inputs

| Key | Label | Description |
| --- | --- | --- |
| amount | US dollar (USD) | The amount in USD. |
| result | Czech koruna (CZK) | The same amount in CZK. |
| rate | Rate: CZK per 1 USD | How many CZK one USD buys. It starts at the ECB rate of 28 September 2026; type your bank's rate to use it. |

## Outputs

| Key | Label | Description |
| --- | --- | --- |
| amount | US dollar (USD) | The amount in USD. |
| result | Czech koruna (CZK) | The amount in CZK. |
| rate | Rate: CZK per 1 USD | How many CZK one USD buys in this answer. |
| inverse | Inverse: USD per 1 CZK | How many USD one CZK buys. |

## Method

CZK = USD × rate. The ECB rate is a cross rate: (CZK per euro) ÷ (USD per euro), to 6 significant figures.

## Assumptions

- The default rate, 1 USD = 21.4423 CZK, is worked out by this site from the ECB euro reference rates of 28 September 2026: 24.397 CZK per euro ÷ 1.1378 USD per euro, rounded to 6 significant figures. The ECB does not publish rates between two non-euro currencies.
- The ECB publishes its reference rates for information purposes only, not for transactions. Banks and cards add a margin or a fee; type their rate to see what you would get.
- Amounts are rounded to 2 decimal places, without trailing zeros (24.4 means 24.40), and rates show up to 7 significant figures; the calculation keeps full precision.

## Worked examples

1. amount = 100, rate = 21.44 gives result = 2,144. Source: hand calculation: amount × rate, at the ECB rate of 28 September 2026 for USD to CZK (21.4423) rounded to 4 significant figures.
2. result = 100, rate = 21.44 gives amount = 4.664179. Source: hand calculation: amount × rate, at the ECB rate of 28 September 2026 for USD to CZK (21.4423) rounded to 4 significant figures.
3. amount = 100, result = 2,144 gives rate = 21.44. Source: hand calculation: rate = result ÷ amount.

## FAQ

### How much is 1 USD in CZK?

At the ECB euro reference rates of 28 September 2026, 1 USD = 21.4423 CZK, and 1 CZK = 0.04663688 USD.

### Where does the USD to CZK rate come from?

The ECB quotes every currency against the euro only. On 28 September 2026, 1 euro bought 1.1378 USD and 24.397 CZK, so 1 USD = 24.397 ÷ 1.1378 = 21.4423 CZK. This cross rate is worked out by this site; the ECB does not publish it.

### Can I use this rate at my bank?

Not exactly. The ECB publishes its reference rates for information purposes only and strongly discourages their use for transactions. Banks, cards, and exchange offices add a margin or a fee. Type the rate they offer into the rate box to see what you would receive.

### How often does the rate change?

The ECB sets one reference rate per currency on each TARGET working day, at about 16:00 CET. This page shows the rates of 28 September 2026; they change when the site is rebuilt with a newer copy.

## Sources

- European Central Bank, euro foreign exchange reference rates of 28 September 2026. https://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml
- European Central Bank, "Euro foreign exchange reference rates": published at about 16:00 CET on TARGET working days, for information purposes only. https://www.ecb.europa.eu/stats/policy_and_exchange_rates/euro_reference_exchange_rates/html/index.en.html
- European Central Bank, disclaimer and copyright: free reuse with the ECB cited as the source; changes to the data must be stated. https://www.ecb.europa.eu/services/using-our-site/disclaimer/html/index.en.html