- Common Slope Angle Conversions - This chart shows a number of slopes related to airport design and airspace. Slopes are shown as ratio, percent, and degree.
- Angle converter (MS Excel) - This spreadsheet can be used to convert any angle expressed in one form, for example percent, to the same angle expressed in different units, such as degrees.
- Vertical Datum converter - This web site provides a means for converting between vertical datums.