Can I use this currency calculator offline?

Yes, absolutely. This calculator is designed to be fully functional offline. It does not require an internet connection for its core conversion features. However, you are responsible for keeping the exchange rates up-to-date manually using the built-in 'Rates Editor' for accurate conversions.

How do I update the exchange rates?

You can update rates in two ways: 1) Go to the 'Rates Editor' tab, find the currency you want to update, and type in the new rate relative to USD. Click 'Save Rates'. 2) Use the 'Import' feature within the Rates Editor to upload a CSV or JSON file containing a list of currency codes and their new rates.

Why do the results from this calculator differ from my bank's rates?

Banks and financial institutions apply a 'spread' or margin to the mid-market exchange rate. This means the rate you get for buying a currency is different from the rate for selling it. This calculator uses a single rate (which you provide) and allows you to add custom fees or percentages to simulate these extra costs, but it may not match the exact, dynamic rate offered by a specific provider at a given moment.

Can I convert many amounts at once?

Yes. Use the 'Batch Conversion' tab. You can paste multiple lines of data in formats like '100 USD EUR' or '50,GBP,JPY'. The tool will process each line, show you a table of results, and report any lines that could not be converted.

Is my data (rates, history) stored anywhere?

All data, including your custom rates, conversion history, and presets, is stored exclusively in your browser's `localStorage`. It is never sent to any server and is private to your device and browser. You can clear all this data at any time from the 'Settings' tab.

How do I reset all rates back to the original defaults?

In the 'Rates Editor' tab, simply click the 'Reset Default Rates' button. This will discard any changes you've made and restore the initial set of approximate rates.

What does 'rate relative to USD' mean?

This means all exchange rates are stored based on how many units of that currency you get for 1 US Dollar. For example, if the EUR rate is 0.92, it means 1 USD = 0.92 EUR. The calculator uses this base rate to correctly calculate cross-rates between any two currencies (e.g., EUR to JPY).

Currency Calculator - All World Currencies (Offline & Editable Rates)

Currency Calculator

Convert Currencies

Amount

From

Advanced Options (Fees, Rounding)

Fee (%)

Fixed Fee

Apply Fee

Precision

Rounding

Paste Data

One conversion per line. Formats: `amount from to`, `amount,from,to`.

Data & Tools

Rates are relative to USD (1.0). They are saved in your browser and used for all offline calculations. Update them for accuracy. iExample: If 1 USD = 0.92 EUR, the rate for EUR is 0.92.

Filter Currencies

Code	Currency Name	Rate vs USD

Your last 20 conversions are saved here.

Save and load frequent conversions.

Local Data Management

This will clear all saved rates, history, and presets from your browser. This action cannot be undone.

About & FAQ

What is a Currency Calculator?

A currency calculator is a tool that converts the value of one currency into another. It's essential for travelers, online shoppers, businesses dealing with international payments, and anyone involved in forex trading or accounting. By providing an exchange rate, it performs the multiplication or division needed to determine the equivalent value in the desired currency.

How Offline Rates Work

This calculator is unique because it's designed to work entirely offline. It comes pre-loaded with a full list of world currencies and approximate exchange rates based on a USD (United States Dollar) base. This means every currency's value is stored as 'how much of it equals 1 USD'. For the calculator to be accurate, you must periodically update these rates yourself using the "Rates Editor". You can find current rates from a reliable financial source and input them manually or import them from a file. This gives you full control and privacy, with no reliance on external APIs.

Understanding Fees & Commissions

When you exchange money at a bank or a currency exchange service, they rarely give you the 'mid-market' rate you see online. They add fees, either as a fixed amount (e.g., $5 per transaction) or a percentage of the total (e.g., 2.5%). Sometimes, they do both. This calculator's "Advanced Options" let you simulate these costs. For example, converting $100 to EUR with a 2% fee means you are effectively converting only $98, resulting in fewer euros. Understanding these fees is crucial for calculating the true cost of a currency exchange.

Tips for Using the Calculator

Refresh Rates Regularly: Currency markets are volatile. For important calculations, update your rates daily from a trusted financial news source.
Use Presets for Travel: If you're traveling, save a preset for your home currency to your destination currency (e.g., "USD to JPY") to perform quick conversions on the go.
Be Mindful of Rounding: For large transactions, the choice of rounding (nearest, up, or down) and decimal precision can make a difference. For everyday calculations, 2 decimal places are usually sufficient.
Leverage Batch Mode: If you have a list of transactions to convert (e.g., from a spreadsheet), use the Batch Conversion tab to process them all in one go and export the results.

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