Business Insider published a report this week that there will be 4 IoT devices per person by Year 2020, that is roughly 34 billion IoT devices.
Earlier Gartner published that there would 6.4 billion Internet connected “things” will be there by end of 2016 and 21 billion by end of 2020.
Their definitions are consistent, which include all gadgets that are connected to internet – Computers and Smartphones – being the majority today.
Going by newer projections by Business Insider, the devices will grow by 50% annually upto five times the current volume.