Currency Converter

How to use the Currency Converter

The Currency Converter is free and runs entirely in your browser — no sign-up, and nothing you enter leaves your device. It opens pre-filled with a realistic example, so you can see how it works before replacing any figure with your own; the results update as you type. Press Calculate to refresh the result panel, or Reset to return to the example.

The inputs it asks for:

• Amount — a dollar amount.
• From — choose from 12 options (USD, EUR, GBP, …).
• To — choose from 12 options (USD, EUR, GBP, …).

The formula

It converts through a common base: your amount is divided by the source currency's reference rate to a base value, then multiplied by the target currency's rate. The quoted exchange rate is simply the ratio of the two:

Converted = Amount × (rate_to ÷ rate_from)

rate_from / rate_to

each currency's reference rate against the common base

These are reference (mid-market) rates refreshed daily — not the price you'll actually transact at. Banks and card networks add a spread and sometimes a fee, so the real cost of exchanging money is usually a percent or two worse than the mid-market figure shown.

Worked example

Using the example values — Amount $1,000.00, From USD, To EUR — the Currency Converter returns a USD → EUR of 866.50 EUR. It also reports Exchange Rate (1 USD = 0.8665 EUR), Inverse (1 EUR = 1.1541 USD).

Prefer your own numbers? Change any field above and this recomputes instantly.

Key terms

Exchange rate

How much of one currency you get for one unit of another.

Mid-market rate

The midpoint between the buy and sell price — the "true" rate before any margin.

Spread

The gap a provider adds around the mid-market rate as its margin.

Frequently asked questions