Sources & Data
We believe in transparency. Here are the data sources and references we use to power our tools.
Currency exchange rates
Our currency converter uses the Frankfurter API, which provides reference exchange rates from the European Central Bank (ECB). Rates are updated daily (around 16:00 CET) and cover 30+ currencies. The Frankfurter API is free, open, and does not require an API key.
Note: These are reference rates for estimates and general conversions, not real-time trading rates.
Unit conversions
Length, weight, temperature, area, volume, speed, and other unit converters use standard conversion factors from NIST (National Institute of Standards and Technology) and widely accepted international standards. All conversions are computed client-side with fixed conversion factors.
Calculators
Math, financial, and other calculators use standard formulas and algorithms. No external data sources are required — calculations run entirely in your browser.
Questions?
If you have questions about our data sources or accuracy, please contact us.