I think you are talking about the blackbody radiation of the human body.
you can use Wien's Law to solve it, which is λ(max)=b*T, where b is Wien's displacement constant: b=0.002897mK. As the human body has an average temperature of about 37 Celcius degrees (310.15 Kelvin). λ(max)~9300 nm. If you want to see the actual spectrum, check out the blackbody-radiation with a peak value of ~9300 nm should give you the answer.
@ Oren Pinshow
The radiation emitted by the human body is in the IR range at a wavelength of 12 microns.
At normal body temperatures, it is of the wavelength of 10 microns.
https://www.univie.ac.at/geographie/fachdidaktik/FD/site/external_htmls/imagers.gsfc.nasa.gov/ems/infrared.html
Dean Oren Pinshow, to complement the answer provided by Prof. Jierui Yu.
This is the screenshot simulation using PhET with this data:
T = 300 K and λ(max)~9308 nm gives the intensity as 459 W/m2
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