This is how many people that can live sustainably per square kilometre, depending on latitude. There are also other local variables like the terrain, altitude, climate and ocean currents that need to be considered.

Converting the 60 million square kilometres of land that is currently used by people to sustainable communities would support 6 billion people and with marginal land made arable with water catchments, could support 7 billion people and with reforesting the deserts, over time 10 billion people is possible.
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Once we secure the future our population will find its balance. Overpopulation is caused by fear. Fear of the future and fear of the other. Any attempt at population control will inevitably backfire. Once we have equality, we will then be able to live in harmony with each other and with nature.