The number of microwave ovens in the world is difficult to determine precisely due to various factors, including population growth, market demand, and varying ownership rates in different regions. However, microwave ovens are widely used and can be found in homes, offices, and various food establishments around the world.
It's worth noting that the microwave oven market has been expanding over the years, and they have become a common appliance in many households globally. The number of microwave ovens in circulation is likely to be significant, but it would require comprehensive market research or data from relevant industry sources to obtain an accurate estimate of the current worldwide count.