Microwaves come in a range of sizes. The size you need will vary depending on your available space and your household needs. You will need to consider both the internal capacity and the exterior dimensions when buying a microwave. Capacity Microwave capacity is measured in litres. Capacity will usually range from 15L to over 32L for standard microwaves. However, capacity is often higher for combi microwaves, with capacities of over 45L available. To fit a standard sized plate, you’ll need a capacity of at least 20-25L. However, we’d recommend a capacity of over 26L for a family. This will give you a larger turntable size, and additional height. Dimensions If you’re buying a built-in microwave oven, or a wall microwave, the microwave dimensions will be of importance. You’ll need them to fit on your microwave shelf or wherever your integrated microwave is set to go. Remember to also consider any required ventilation space. If you’re buying a freestanding microwave, the dimensions are less important. However, you do need to consider how much countertop space you are willing to use.