Because they need to fit into the space above a standard cooktop over the range microwaves offer less variation than countertop models in terms of size.
Standard over the stove microwave size.
Their heights range from 12 to 16 inches.
Typical over the range microwave under 30 kitchen cabinet might have an actual width 29 1 2 29 3 4 29 7 8 29 15 16 or precise 30.
The more the merrier.
Note that they are organized by capacity.
Over the range microwave average size and dimensions the typical external microwave dimensions of an over the range microwave are 30 inches wide 15 inches tall and 16 inches deep although they can vary as they need to fit into specific cabinet spaces.
Typical over the range microwave designs are 16 inches high by 30 inches wide by 15 inches deep.
Most models have a width of between 29 and 30 inches a depth of between 15 and 16 inches and a height of between 16 and 18 inches.
Internal capacities of over the range models range from 1 to 2 cubic feet.
The average height of an otr microwave oven is about 17.
Therefore considering the earlier measurements discussed in point 1 above you will have about 13 of distance left between the cooktop and the bottom of the otr microwave oven.
Typical dimensions over the counter microwave 24 x 14 x 16 width height depth and 1 5 cubic feet capacity.