A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

- Scruples (UK, apoth) (Weight)
- Second (Time)
- Second (angle) (Angle)
- Sections (Area)
- Sextant (Angle)
- Shake (Time)
- Sign (angle) (Angle)
- Slug foot/second
^{2}(Force) - Slug force (Force)
- Slug/cubic foot (Density)
- Slug/hour (Mass Flow)
- Slug/minute (Mass Flow)
- Slug/second (Mass Flow)
- Slugs/foot second (Dynamic Viscosity)
- Spans (Length)
- Spans (Volume)
- Spat (Length)
- Speed of light (Linear Velocity)
- Square (Area)
- Square angstrom (Area)
- Square caliber (Area)
- Square centimetre/second (Kinematic Viscosity)
- Square centimetres (cm
^{2}) (Area) - Square cubit (Area)
- Square digit (Area)
- Square fathom (Area)
- Square feet (Area)
- Square foot inch of mercury (0 °C) (Force)
- Square foot inch of mercury (15.56 °C) (Force)
- Square foot/hour (Kinematic Viscosity)
- Square foot/second (Kinematic Viscosity)
- Square furlong (Area)
- Square inch/hour (Kinematic Viscosity)
- Square inch/second (Kinematic Viscosity)
- Square inches (in
^{2}) (Area) - Square kilometres (km
^{2}) (Area) - Square metre/hour (Kinematic Viscosity)
- Square metres (m
^{2}) (Area) - Square miles (Int. Nautical) (Area)
- Square miles (Int.) (Area)
- Square millimetre/hour (Kinematic Viscosity)
- Square millimetre/second (Kinematic Viscosity)
- Square millimetres (mm
^{2}) (Area) - Square rods (Area)
- Square yards (Area)
- Standard atmosphere (Pressure)
- Stigma (Length)
- Stokes (Kinematic Viscosity)
- Stones (Weight)

Note: Use a period as a decimal point, or use scientific notation: 24E-2 - Incorrect conversion? Missing a conversion? Let us know.