Highest-earning educational contributor to YouTube

As of February 2015, YouTube stats expert Social Blade estimated that the highest-earning channel posting children's educational content is "LittleBabyBum", earning something in the range of $845,500 to $13.5 million annually – a mean average of $7.17 million. Founded in 2011, the channel is managed by animator and app developer team Derek Holder and his wife (UK), who were surprised by what they regarded as the poor quality of nursery-rhyme videos on the website. As of 17 July 2015, the super-popular channel, which is most well known for animated songs such as "Wheels on the Bus", had 3,123,702 subscribers and its videos had received more than 3.3 billion views. Social Blade estimates earnings for each YouTube channel based on the money generated for every thousand ad views. According to Social Blade, the reason that the range is so big is because "the CPMs [cost per thousand views] vary so much. They can be anywhere from $0.25 to $4.00 on average," Arnold told HuffPost via email. "It’s a huge range because we just don’t know CPM’s for individual channels, or many of the factors that would affect it, like what country their audience is based in, how many views are from mobile, how many of their viewers have Adblock, etc. Stuff like that all affects earnings."

The earnings totals also don't take into account the cut that Google takes.