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 Refractive Index of Air Calculator 
 Based on Modified Edlén Equation 

Refractive Index of Air Calculator is a web-based tool for calculating the index of refraction of air and wavelength of light in air as a function of various input parameters, using the Ciddor Equation or a modified version of the Edlén Equation.

Index of Refraction of Air
Jack A. Stone and Jay H. Zimmerman

Vacuum Wavelength and Ambient Conditions
Based on Modified Edlén Equation

InputAmount
Vacuum Wavelength:
Air Temperature:
Atmospheric Pressure:
Air Humidity:
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Web Site Home: Engineering Metrology Toolbox
Technical Inquiries: Ted Doiron, Group Leader
Dimensional Metrology
Semiconductor and Dimensional Metrology Division
Physical Measurement Laboratory
NIST, 100 Bureau Drive, Stop 8211, Gaithersburg, MD 20899-8211

The National Institute of Standards and Technology (NIST) is an agency of the U.S. Department of Commerce.
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NIST Program Questions: Public Inquires Unit
(301) 975-NIST (6478) TTY (301) 975-8295
NIST, 100 Bureau Drive, Stop 3460, Gaithersburg, MD 20899-3460

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Date Created: Wednesday, November 22, 2000
Last Updated: Wednesday, November 24, 2004
Technical Web Site Questions: Jay Zimmerman
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