# USD to Euro converter

Converts US dollar (USD) to Euro (EUR) 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-euro
- JSON spec: https://www.acalculator.org/convert/usd-to-euro.json
- Version: c6c794c986b1

## Default answer

Example with the default inputs (US dollar (USD) 10, Rate: EUR per 1 USD 0.878889): 10 USD = 8.79 EUR, at 1 USD = 0.878889 EUR. The ECB reference rates of 28 September 2026 give 1 USD = 0.878889 EUR.

## Inputs

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

## Method

EUR = USD × rate, with the ECB euro reference rate by default.

## Assumptions

- The default rate, 1 USD = 0.878889 EUR, is from the ECB euro reference rates of 28 September 2026 (1 ÷ 1.1378 USD per euro).
- 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 = 0.8789 gives result = 87.89. Source: hand calculation: amount × rate, at the ECB rate of 28 September 2026 for USD to EUR (0.878889) rounded to 4 significant figures.
2. result = 100, rate = 0.8789 gives amount = 113.778587. Source: hand calculation: amount × rate, at the ECB rate of 28 September 2026 for USD to EUR (0.878889) rounded to 4 significant figures.
3. amount = 100, result = 87.89 gives rate = 0.8789. Source: hand calculation: rate = result ÷ amount.

## FAQ

### How much is 1 USD in EUR?

At the ECB euro reference rates of 28 September 2026, 1 USD = 0.878889 EUR, and 1 EUR = 1.1378 USD.

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

The ECB quotes USD against the euro: on 28 September 2026, 1 euro bought 1.1378 USD. So 1 USD = 1 ÷ 1.1378 = 0.878889 euro.

### 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