# USD to IDR converter

Converts US dollar (USD) to Indonesian rupiah (IDR) 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-idr
- JSON spec: https://www.acalculator.org/convert/usd-to-idr.json
- Version: d3cab27a0137

## Default answer

Example with the default inputs (US dollar (USD) 1, Rate: IDR per 1 USD 17,976.6): 1 USD = 17,976.6 IDR, at 1 USD = 17,976.6 IDR. The ECB reference rates of 28 September 2026 give 1 USD = 17,976.6 IDR.

## Inputs

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

## Method

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

## Assumptions

- The default rate, 1 USD = 17,976.6 IDR, is worked out by this site from the ECB euro reference rates of 28 September 2026: 20,453.78 IDR 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 = 17,980 gives result = 1,798,000. Source: hand calculation: amount × rate, at the ECB rate of 28 September 2026 for USD to IDR (17,976.6) rounded to 4 significant figures.
2. result = 100, rate = 17,980 gives amount = 0.005562. Source: hand calculation: amount × rate, at the ECB rate of 28 September 2026 for USD to IDR (17,976.6) rounded to 4 significant figures.
3. amount = 100, result = 1,798,000 gives rate = 17,980. Source: hand calculation: rate = result ÷ amount.

## FAQ

### How much is 1 USD in IDR?

At the ECB euro reference rates of 28 September 2026, 1 USD = 17,976.6 IDR, and 1 IDR = 0.00005562786 USD.

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

The ECB quotes every currency against the euro only. On 28 September 2026, 1 euro bought 1.1378 USD and 20,453.78 IDR, so 1 USD = 20,453.78 ÷ 1.1378 = 17,976.6 IDR. 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