Gray Body Calculator (version 2022.1)
Compute A Single Value Create A Table Of True Temperatures K°C°F°R K°C°F°R unitless K°C°F°R K°C°F°R unitless unitless unitless unitless K°C°F°R	lambda (µm) weight sensor response curve	INSTRUCTIONS: 1. First, use the large pull-down-list at the top to select the type of computation you wish to make. 2. Square check-boxes control which parameters are considered in the computation. Parameters which are always used do not have a square check-box. If a square check-box is not checked, the associated controls disappear to indicate they are inactive. 3. When computing a single value, the round radio-buttons select which parameter to compute. The round radio-button disappears if a parameter is inactive, can not be solved for, or you have selected to compute a table of true temperatures. 4. Type known parameter values in their text-boxes. 5. The small pull-down-lists select temperature and length units. 6. Finally, press the "compute" button. This may take a while, so please be patient!
Move the mouse cursor over the controls above to see help items. Note that when temperature values are close to absolute zero, calculated values become inaccurate. Also note that calculations are iterative and take a while. Please be patient. For longer calculations, your browser mak ask if it should continue. Keep selecting yes until the calculation is done. If you are using the Firefox Mozilla browser, you may adjust the about:config dom.max_script_run_time setting to extend the run time.
Eric Whitenton and Brandon Lane, National Institute of Standards and Technology.
This web page is free to use, and is provided as is with no guarantees. You can use it offline by saving it on your hard drive. It is stand alone, and does not require access to other websites.
NIST Software Disclaimer: This software was developed at the National Institute of Standards and Technology by employees of the Federal Government in the course of their official duties. Pursuant to title 17 Section 105 of the United States Code this software is not subject to copyright protection and is in the public domain. It is an experimental system. NIST assumes no responsibility whatsoever for its use by other parties, and makes no guarantees, expressed or implied, about its quality, reliability, or any other characteristic. We would appreciate acknowledgement if the software is used. This software can be redistributed and/or modified freely provided that any derivative works bear some notice that they are derived from it, and any modified versions bear some notice that they have been modified.