Conversion Factors
Information on Coversion Calculators
Guide for the Use of the International System of Units - Everything you need to know about SI. A NIST special publication, available as PDF file for download.
How Many? - From Russ Rowlett, University of North Carolina, a comprehensive dictionary of units of measurement covering the English customary systems, the metric system, and the International System of Weights and Measures (SI).
International System of Units (SI) - essentials, background, and bibliography on the SI, the modern metric system.
Measurement Conversion - Online conversion of common units: length, area, volume, mass, force, time, temperature, pressure, flow rate, and some more (JavaScript).
Measurement Conversions - conversion tables and equations, conversion software to download, and links.
Measuring Units Conversion Tables - convert between metric and imperial and US measurement systems.
Metric and English Unit Conversions - convert area, length, temperature, time, volume, weight, and fruit between different unit measurements.
Metric Conversion - includes weight, length, and volume.
Metric Conversion Calculator - converts from metric to English and vice-versa.
Metric System (SI) - information on the International System.
Metrology Forum - the science of measurement or calibration and associated topics. Enlightenment to the uninitiated and soul-food to practitioners of this art.
National Institute of Standards and Technology Metric Program - helps implement the national policy to establish the metric system as the preferred system of weights and measures for U.S. trade and commerce.
NumberExchange.net - categories include illumination, power, pressure, and speed.
Oh, Those Confusing Gas Flow Units! - Tech tip by Anthony Herbert, Sulzer Metco, Inc. about the units used for gas flows and their conversion considering the standard conditions.
OMDI Unit Calculator - Unit conversion program for the Power Mac which supports drag and drop. Though not free there is a fully functional, time limited demo available.
OmniCon 98 - Unit conversion software for Windows 95/98, and NT. Includes metric system, imperial system, US customary system, CGPM standard units and others. Free evaluation copy available for download. Full version costs $14.95.
Online Temperature Converter - converts Fahrenheit to Kelvin/Reaumur/Celsius/Rankine and Celsius/centigrade to Fahrenheit/Kelvin/Reaumur/Rankine.
Scales & Weights - photos of a collection of historical scales and weights, with trading opportunities.
SI: The International System of Units - SI provides a logical and interconnected framework for all measurements in science, industry, and commerce.
Temperature Conversion Calculator - plus a bit about temperature and units.
This2That - Commercial unit conversion calculator software for Windows, restricted demo available for download.
Ultimate Sizeconverter, The - converts body height or weight from Anglo-Saxon to Metric and vice versa.
Uncertainty of Measurement Results - From NIST, essentials of expressing measurement uncertainty.
Uncertainty of Measurement Results - guidelines for the expression of uncertainty in measurement from the National Institute of Standards and Technology.
Unit Conversion - Javascript utility for online conversion of length, area, volume, weight, pressure, speed, temperature, and time units.
Unit Converter - Java or form-based conversion of scientific, engineering, and common units.
unitsIQ.com - engineering/scientific unit conversion calculator. Also offers currency conversion and a database of constants.
UnitStar - Unit converter for Windows 3.1/95/98/NT, 450 measurement units grouped into 28 categories, many features, shareware.
Weights and Measures and Standard Time - Chapter 6 of United States Code Title 15 - Commerce and Trade.