How to calculate the sea-level barometric pressure given only a barometric reading and elevation?

I'm developing an iPhone app that uses the iPhone 6's altimeter function to calculate the current sea-level pressure.

Instructions for calculating the sea-level barometric pressure given only a barometric reading and elevation can be found here
http://san.hufs.ac.kr/~gwlee/session3/reduction.html

https://view.officeapps.live.com/op/view.aspx?src=http%3A%2F%2Fwww.aos.wisc.edu%2F~aos330%2Flabs%2FSLP%2520adjustment.doc

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To a first approximation, the pressure decreases 10 mb / 100 meters
Works best below 10,000'.

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