| AreaExtensions | Convenience methods for Area |
| CompoundUnit | Represents an abstract unit of measurement that comprises two other distinct units. |
| ConversionCache | Singleton that contains the cache of conversion factors used throughout the Quantitative assembly. |
| EnglishAttribute | When applied to a Unit, indicates that the unit is part of the English measurement system. |
| ExponentialAttribute | When applied to a Unit, indicates that the unit uses Metric exponents. |
| IncompatibleUnitException | Thrown when an attempt is made to convert between two units of measurement that are not compatible. |
| LengthExtensions | Convenience methods for Length |
| MassExtensions | Convenience methods for Mass |
| PressureExtensions | Convenience methods for Mass |
| SpeedExtensions | Convenience methods for Mass |
| SystemInternationalAttribute | When applied to a Unit, indicates that the unit is part of the International (S.I.) measurement system. |
| TemperatureExtensions | Convenience methods for Temperature |
| TimeExtensions | Convenience methods for Mass |
| Unit | Represents an abstract unit of measurement. |
| UnknownUnit | Represents an unknown or undefined Unit. |
| VolumeExtensions | Convenience methods for Mass |
| Area | Represents the quantity of a two-dimensional area in space. |
| Length | Represents the quantity of a one-dimensional line in space. |
| Mass | Represents the constant value relating to acceleration and force in a physical object. |
| Pressure | Represents the force exerted by a fluid over a defined area. |
| Speed | Represents the motion of an object through space over time. |
| Temperature | Represents an amount of heat in the environment. |
| Time | Represents a discrete interval of time. |
| Volume | Represents the displacement of an object in three-dimensional space. |
| IConvertibleT | Defines the behavior of a class that can be converted from one Unit to another. |
| IMeasurable | Defines the behaviors of measurement, such as Length or Volume. |
| MetricExponent | Enumerates the 20 International System prefixes used to form decimal multiples and sub-multiples of International System units |