There is no unit like Donkey Power. This is a unit created for fun. But this is defined as 50 watt or 1/3 horse power. Though all the horses do not reveal the same power, horse power is defined by calculating the average of all the horses. Based on this, horse power is measured and standardization is done. This is used for measuring the measure of machines. Nowhere is it used as donkey power. Its definition is also valued by rough estimation.