WiseCalcs

Currency converter

Enter an amount and the exchange rate — how many target units one source unit buys. The converter multiplies them and shows the converted amount, plus the inverse rate for converting back.

Use it to convert any amount at a rate you supply, without needing a live feed.

Converted amount

92

Inverse rate
1.087

The result updates as you type. The headline is the converted amount; the inverse rate tells you how to convert in the other direction.

How does it work?

You supply the exchange rate, so no live feed is needed. Real conversions also include a spread or fee, so a bank or app may give a slightly different amount.

Currency conversion formula

converted=amount×rate\text{converted} = \text{amount} \times \text{rate}
amount
Amount in the source currency.
rate
Target units per one source unit.
converted
Amount in the target currency.

100 at a rate of 0.92 converts to 100 × 0.92 = 92. The inverse rate, 1 ÷ 0.92 ≈ 1.087, converts back.

Method & sources

The converted amount is the source amount times the exchange rate. You supply the rate, so no live market feed is used. The inverse rate is one divided by the rate.

Sources

Where this method comes from — use these references to understand the formula, assumptions, and limits.

How we calculate

  • The converted amount is the source amount times the exchange rate.
  • You supply the rate, so no live market feed is used.
  • The inverse rate is one divided by the rate.
  • Real conversions include a spread or fee not modelled here.

Rounding

The converted amount shows two decimals and the inverse rate four. The calculation uses full precision.

What this calculator does

Converting currency is a single multiplication: the amount times the exchange rate. This converter takes a rate you provide — from your bank, an app, or a published mid-market figure — so it works offline and for any pair, and it gives the inverse rate to convert the other way.

How to use it

  1. Enter the amount in the source currency.
  2. Enter the exchange rate (target per source unit).
  3. Read the converted amount.
  4. Use the inverse rate to convert back.

A worked example

100 at a rate of 0.92 converts to 92. The inverse rate is 1 ÷ 0.92 ≈ 1.087, so 92 in the target currency converts back to 100.

Finding a rate

Mid-market rates are published online and update constantly. Banks and apps add a margin, so the rate you actually get is a little worse. Enter the rate you'll be charged for a realistic result.

Common mistakes

  • Entering the inverse rate by mistake — check which way the rate runs.
  • Using a mid-market rate when you'll pay a margin.
  • Forgetting transfer or card fees on top of the rate.

When it's useful

Quick conversions while travelling, checking a price abroad, or working out a transfer at a known rate.

FAQ

How is the conversion calculated?
The amount is multiplied by the exchange rate. At a rate of 0.92, 100 becomes 92.
Does it use live exchange rates?
No. You enter the rate, so it works for any pair and offline. Use a current rate for an up-to-date result.
What is the inverse rate?
One divided by the rate. It converts amounts back from the target currency to the source.
Will it match what my bank gives?
Only if you enter the bank's rate. Banks and apps add a margin to the mid-market rate, plus possible fees.
Which way does the rate go?
It's the number of target units per one source unit. If 1 source = 0.92 target, enter 0.92.
Can I share a calculation?
Yes. Use Share to copy a link that reopens the converter with the same amount and rate.

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