FREETY.TOOLS

Frequently asked questions (FAQs)

• Can I convert decimal or negative values?

  Yes, you can. You can input decimal values (e.g., 12.5) as well as negative values (e.g., -50) if direction is a consideration.
  The conversion logic performs purely mathematical transformation on the value, and the result will also be displayed as a decimal or negative number.

• The converted result is too long or the number of decimal places is inconsistent. Can I specify the decimal places?

  An option to specify the number of decimal places is provided in the converter. You can use this option to round or format the result to your desired precision (e.g., 2 or 4 decimal places).

• Are 'km/h' and 'kmph' the same unit?

  'km/h' (Kilometer per Hour) is the international standard and scientific notation.
  'kmph' is an abbreviation often used in daily life, but the converter uses the standard symbol 'km/h' as its primary key.
  However, 'kmph' may be accepted as input for user convenience.

• Why does the conversion rate for Knots (kt) differ from 'km/h' or 'mph'?

  Knots are based on a specialized distance unit called the Nautical Mile.
  One nautical mile is based on one minute of latitude on Earth's meridian, approximately 1,852 meters.
  Therefore, 1 knot (1 nmi/h) is 1,852 m/h, which means its direct conversion factor is different from the common mile (1,609.344 m) or kilometer (1,000 m).

• Why might the Mach (M) unit be difficult or inaccurate to convert?

  Mach represents a ratio to the speed of sound, which varies depending on the surrounding environment (especially temperature and altitude).
  If the converter uses a fixed Mach factor (e.g., speed of sound at Standard Temperature and Pressure - STP), the conversion may be inaccurate compared to the actual speed of sound in a real flight environment.

• Which unit does this converter's logic use as its base for conversion?

  Our converter handles all conversions based on the SI base unit for speed, which is the Meter per Second (m/s).
  For example, to convert 'km/h' to 'mph', the value is first converted from 'km/h' to 'm/s', and then from 'm/s' to 'mph' to derive the final result.

• I get an 'Unknown unit key' error during conversion. Why?

  This error occurs when the source unit or target unit entered by the user does not exist in the defined unit list of the converter.
  Please ensure that the unit symbols are entered correctly and that the unit is included in the available unit list.

• When converting large values (e.g., 1 billion km/h), the result shows exponential notation with 'e+'.

  This happens when the number is too large or too small for the standard float data type to process.
  While our converter formats the result using decimal place specification for user convenience, extremely large or small values may automatically be displayed in scientific notation.