SI Unit Converters

Units of Acceleration Acceleration
Units of Substance Amount of
     Substance
     (clinical data)

Units of Angle Angle
Units of Area Area
Units of Capacity Capacity
Units of Density Density
Units of Distance Distance
Units of Electricity Electricity
Units of Energy Energy
Units of Flow Flow
Units of Force Force
Units of Fuel Consumption Fuel
     Consumption

Units of Heat Heat
Units of Length Length
Units of Light Light
Units of Mass Mass
Units of Moment Torque
Units of Permeability Permeability
Units of Power Power
Units of Pressure Pressure
Units of Radiology Radiology
Units of Temperature Temperature
Units of Time Time
Units of Velocity Velocity
Units of Viscosity Viscosity
Units of Volume Volume
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Unit Conversion Programs
Unit Conversion Programs
Weights & Measures, A Brief History circa 1895.
The International System of                 Units (SI), Description.
Unit Conversion Programs

The new International System, was created in response to the problems a growing scientific community faced in the proliferation of various subsystems improvised to serve particular disciplines. At the same time, it had long been apparent that the original 18th-century standards were not accurate to the degree required to satisfy the 20th-century scientific world. New definitions were required. After lengthy discussion the 11th General Conference on Weights and Measures, meeting in Paris (birthplace of the metric system) in October 1960 formulated a new International System of Units (abbreviated SI). The CGPM is the international authority that ensures wide dissemination of the SI and modifies the SI as necessary to reflect the latest advances in science and technology.
For more infomation about SI, CGPM and their backgrounds, visit:

Bureau International des Poids et Mesures Bureau International des Poids et Mesures.

For convenience in determining accuracy, the factors used in these programs are displayed on the page below each calculator.

Factors in boldface are exact.
The reference for most of the conversion factors used in these programs is found at the


Bureau International des Poids et Mesures National Institute of Standards and Technology.
where extensive information can be referred to directly on-line or downloaded in Appendix B of NIST Special Publication 811 (PDF format).



Copyright (c) 1999 2009 N C Ricketts All rights reserved. Last revised: January 1, 2009