There are many versions of juice calculator available,for various devices from mobile phones (POTV's got a good one)to computer versions "e-juice me up" is a good one.
Please note that these concentrates contain a mixture of flavours which were used to create the M&P unique eliquid flavours. For mixing calculations, they should just be regarded as one flavour. All M&P E-Liquids and Concentrates use 50% PG and 50% VG as a carrier
Hope someone can shed some light on this for you MJS.