If you got the IPad, should try the Platemate from Sweetbee or the sweetbee carbcounter...it's for Free.
https://itunes.apple.com/be/app/platema ... ?l=nl&mt=8
Sweetbee carbcounter, or the ipad app Platemate might be usefull...
https://itunes.apple.com/be/app/platemate/id566278650?l=nl&mt=8
Since yesterday also available on google play store for the Android version.