Transparent calculations

Methodology and Data Source

How the guide uses Frankfurter daily reference observations and clearly derived cross rates.

Effective / last reviewed: July 26, 2026

Frankfurter reference data

The dashboard requests the latest available and historical daily currency reference rates from the Frankfurter API. The reference date returned by Frankfurter is preserved and displayed.

Frankfurter data is not continuously updating market data. On weekends and holidays, the latest available reference date may be an earlier business day. The website does not replace that date with the visitor's current date.

Loading and browser-saved data

  1. The website requests the latest available Frankfurter reference rates when the page opens.
  2. It also requests historical Frankfurter observations for charts, averages, ranges and exports.
  3. While the page remains open, it checks Frankfurter periodically for a newer available reference date.
  4. The last successful Frankfurter dataset is saved in the visitor's browser.
  5. If Frankfurter cannot be reached, the website may display that saved browser copy and clearly labels it as saved data.
  6. If neither Frankfurter nor a saved copy is available, the dashboard reports that reference data is unavailable.
Date transparency: The displayed date is the reference date supplied by Frankfurter. The separate “last website check” shows when the browser most recently contacted the data service.

EUR/AED and AED/PHP rates

EUR/AED is requested directly from Frankfurter. AED/PHP is calculated by dividing the Frankfurter EUR/PHP rate by the Frankfurter EUR/AED rate for the same reference date.

Derived AED/PHP rate: This cross rate is a transparent calculation based entirely on Frankfurter observations. It is not a quotation from a bank or exchange house.

How the indicators are calculated

Previous-session change

The percentage movement from the immediately preceding available Frankfurter observation.

Moving average

The arithmetic average of the latest Frankfurter observations for the selected window. It smooths day-to-day movement but does not predict direction.

Historical range position

The latest Frankfurter observation's relative position between the lowest and highest observations in the recent period.

Volatility

An annualized estimate based on Frankfurter daily percentage changes. Volatility describes the size of past fluctuations, not the direction of the next movement.

Plain-language guide wording

The guide states whether the latest Frankfurter reference cost or conversion value is above, below or near its recent Frankfurter average. It contains no bid, ask, order-entry or execution controls and does not direct a visitor to buy, sell, delay, hedge or use a particular financial provider.

Personal watches, saved plans and date comparisons

Rate watches and saved calculator plans are stored only in the visitor's browser. A watch compares the latest available Frankfurter observation with a user-entered target whenever the page is opened, refreshed or revisited. It is not a continuous server-side monitoring service.

The date comparison tool uses the latest available Frankfurter observation on or before each selected calendar date. It reports the actual dates used. Browser notifications are optional and may appear only when supported and permitted by the visitor's browser.

No prediction: Target levels, historical comparisons and notifications reflect user-defined thresholds and past observations. They are not forecasts or recommendations.

Known limitations

  • Frankfurter reference rates are not prices available to every customer.
  • Actual quotations include spreads, margins, fees, cut-off times and execution conditions.
  • Historical patterns and calculated positioning do not predict future rates.
  • Derived cross rates may differ from commercial quotations because of timing, rounding and provider methodology.
  • Data availability depends on Frankfurter, hosting and internet connectivity.
  • The guide does not account for every user's cash-flow, contractual, credit, hedging, legal or tax circumstances.

Review and corrections

Methodology changes that materially affect outputs will be documented on this page. Suspected data or calculation issues may be reported through the contact page.