Depth steps up with capacity. Panasonic's 1.2 and 1.3 cu ft models are 401 and 410 mm deep; larger units are 493 mm, except NN-SD975S at 506 mm.
Only 2.2 cu ft units reach 356 mm tall.
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More oven volume can mean a wider appliance without more output
Panasonic's Cyclonic Wave models illustrate the space trade-off: the 1.6 cu ft versions are 555 mm wide and the 2.2 cu ft versions are 606 mm wide, yet both groups have maker-rated output of 1250 W. If the smaller cavity suits your dishes, the larger oven does not add cooking output on that figure.
Heating food was outside the work behind this comparison of Panasonic's dimensions and output figures. Use exterior width, height and depth together, then add ventilation clearance from the installation manual. A countertop footprint does not prove safe enclosure fit or trim-kit compatibility. Capacity also does not supply the turntable diameter or the opening your casserole dish needs.
Cooking watts are not the outlet's electrical load
Across these Panasonic ovens, maker-rated microwave output ranges from 1100 to 1250 W and cavity volume from 1.2 to 2.2 cu ft. Those figures describe this manufacturer's selection, not every microwave available. Compare output if cooking power matters, but read electrical input and power-supply instructions separately before installation.
Sensor behavior, evenness and cooking time are outside that comparison; identical output ratings do not mean identical results with your meal.
Before you buy
Do I need extra space around the microwave beyond these sizes?
Yes. The widths, heights and depths here are the oven's own exterior, and they leave out the ventilation clearance Panasonic's installation manual calls for, so read that manual for the exact model before you pick a spot. Below 2.2 cu ft, the ovens themselves stand 304 to 315 mm tall. If you plan to build one in, trim-kit fit is model-specific and isn't covered here. A shallow counter means the 1200 W pair or the 1100 W NN-SU696S, not a 1250 W rating.
Is the wattage what the microwave draws from the outlet?
That figure is Panasonic's microwave output rating, a different number from the electrical input the oven pulls from the wall. Use that model’s input figure when planning the outlet or circuit.
1.2 cu. ft. Countertop Inverter Microwave Oven, 1200W - NN-SN68KSView at Panasonic