Mathématiques

Exchange Rate Calculator

Currency Converter

Indicative rates — for live rates use a forex service.

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Detailed Guide Coming Soon

We're working on a comprehensive educational guide for the Exchange Rate Calculator in your language. The content below is shown in English.

Qu'est-ce que Exchange Rate Calculator?

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A currency exchange rate calculator converts amounts between currencies and applies a spread or fee to show the true cost of exchanging money versus the mid-market rate.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

Formule

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f(x)Amount_target = Amount_source × (rate_source / rate_target); Direct rate: 1 unit source currency = X units target

Légende des variables

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Symbole	Nom	Unité	Description
S	Source currency amount	currency	—
r	Exchange rate	ratio	—
T	Target currency amount	currency	—

Comment Exchange Rate Calculator

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1Mid-market rate: midpoint between buy and sell rates
2Exchange amount = Base amount × Exchange rate
3Banks and bureaux typically add 2–5% margin above mid-market
4Travel cards and Wise often offer near mid-market rates

Exemples résolus

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Exemple 1

Donné:£500 to EUR, mid-market 1.17, bank spread 2%

Résultat:Mid-market: €585; With 2% spread: €573.30 (cost of spread: €11.70)

Applications pratiques

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International travel expense planning

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Global business transactions

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Import/export costing

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Foreign investment valuation

Typical Exchange Spreads

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Provider	Typical spread above mid-market
High street bank	3–5%
Airport bureau	5–12%
Post office	2–4%
Wise / Revolut	0.3–1.5%
Credit card abroad	1.5–3%

Questions fréquentes

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Why do exchange rates change?

Supply/demand for currencies, interest rates, inflation, economic growth, geopolitical events, central bank policy.

What's the difference between bid and ask rates?

Bid = rate banks buy currency (you sell). Ask = rate banks sell (you buy). Spread = profit margin.

Does timing matter when exchanging?

Absolutely. Currency moves daily/hourly. Poor timing costs 2-5% on international transfers. Lock rates when possible.

Regional Guides

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USA▾

USD is base currency; rates quoted per USD

Europe▾

EUR is base; rates per EUR

Commodities▾

Gold/oil priced in USD globally

Références

›Foreign exchange — ECB

Formula-verified for precision

Reviewed October 2026

Our methodology

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