TopConverter will convert between any two (or three) measures of the same type.
This means conversions between such measures as Length:
Centimetres == Metres, Metres == feet, Fathom == Kilometre, etc.
Weight:
Newton == Metric Tonne, KiloNewton == (Newton)x1000, Ounce == Grams, etc.
Energy:
Attojoule == Btu, Joule == Calorie, watthour == Gallon of diesel oil, etc.
Speed:
Knot == Mach, Mach == Kilometre per Hour, Mile per hour == Kilometre per Hour, etc.

More conversion units include, Temperature; Volume; Power; Area, Time, Angle, Clothing Size & Currency.
The currency converter converts between any two (or three) world currencies at once (i.e. At one time using the “triple-taneous” conversion feature.

Also, there is the “Custom” conversion view, where you can determine the conversion variable by yourself, for quick reference/conversion operations.

View the screenshots…