The replacement microwave turntable plate must match your microwave model, not just the diameter of the old glass plate. Measure the plate edge to edge in millimetres and check the shape of the fitting underneath it. Two plates can both measure 270mm but have different centre fittings and may not be interchangeable.
The safest starting point is the microwave’s model number and the manufacturer’s specified replacement part. If you no longer have the original plate, this is especially important.
How to measure your microwave turntable plate
- Switch off and unplug the microwave before handling broken parts or inspecting the cavity. If the glass has shattered, wear suitable protective gloves and remove fragments carefully.
- Measure the full diameter. If the original glass plate is intact, use a tape measure or ruler across its widest point, from outer edge to outer edge, in millimetres.
- Turn it over and examine the centre. Look for three notches, a shaped recess or another drive-coupler pattern. Take a photo to compare with replacement listings.
- Check the roller ring. The plate’s underside should sit correctly on the support ring and engage with the drive coupler.
- Match the appliance model number. Locate the model label, often around the door opening or on the casing, and confirm the part is compatible with that exact model.
Important: Do not measure a replacement plate only from the diameter of the circular roller ring; the two measurements serve different purposes.
Common microwave plate sizes
Replacement glass turntables are advertised in several sizes. The following are examples of diameters you may encounter, not a compatibility chart. No particular diameter is guaranteed to fit any particular microwave capacity or brand.
| Advertised plate diameter | Approximate inches | Still need to verify |
|---|---|---|
| 245mm | 9.6in | Centre fitting and model |
| 255mm | 10.0in | Centre fitting and model |
| 270mm | 10.6in | Centre fitting and model |
| 288mm | 11.3in | Centre fitting and model |
| 315mm | 12.4in | Centre fitting and model |
Measure accurately rather than rounding a 270mm plate to 280mm or assuming that two nearby sizes are interchangeable.
Does microwave capacity tell you the right plate size?
No. An advertised capacity such as 20L or 25L describes the oven cavity volume. It does not establish the glass tray diameter or the pattern of the centre drive fitting. Microwaves with similar capacities may use different trays, so avoid searching only for “20 litre microwave plate”.
How to find the microwave’s model number
Look for a rating label or sticker around the door frame or inside edge of the door opening. Depending on the manufacturer, it may also be on the rear or side panel. Consult the user manual for the exact location. Do not dismantle the microwave housing to find it: microwaves contain high-voltage components, and internal servicing is not a DIY task.
Once you have the model number, search the manufacturer’s spare-parts listing or a reputable parts supplier. Some versions of the same brand’s microwave have different plates, which is why the full model identifier matters.
What if the original plate is missing or shattered?
Use the model number first. If the manual or official parts catalogue identifies a specific glass turntable part, order that part or a replacement explicitly listed as compatible. Guessing from the visible roller ring and approximate cavity width is unreliable.
Also inspect the roller ring and centre coupler for damage without opening the appliance casing. A damaged coupler can prevent the new plate from turning correctly, even when the glass itself is the correct size.
Can you use a universal microwave turntable plate?
Some replacement trays are marketed as universal, but that does not mean they fit every microwave. Read the listing carefully: it should state the diameter, centre fitting and supported models. A plate must rest securely on the roller ring and engage properly with the drive mechanism.
Never force a replacement plate into place, alter its fittings or continue using a plate that slips, jams or contacts the cavity walls.
Where to buy a replacement microwave glass plate
If you’ve confirmed the correct diameter, coupler shape and model compatibility, you can browse replacement microwave turntable plates on Amazon UK. Use your exact model number in the search rather than relying on the plate diameter alone.
Check the seller’s fitment information and returns policy before ordering. The search link above is a general shopping link, not a recommendation for an unverified replacement part.
Frequently asked questions about what size replacement microwave turntable plate do I need
Are all 270mm microwave plates the same?
No. Even if the outer diameters match, plates may have different moulded centres or underside support patterns.
Can I use a slightly smaller glass plate?
Only if the replacement is explicitly approved or listed as compatible with your microwave model. A smaller plate may not sit or rotate correctly.
Does a 20L microwave always use a 245mm plate?
No. Microwave capacity does not determine turntable diameter. Check the manufacturer’s specifications for your exact model.
What if my microwave plate doesn’t spin?
Check that the glass is seated on its support ring and centre coupler. If the plate is correctly fitted and still does not rotate, the issue may be with the roller support, coupler or internal mechanism. Stop using it if operation is abnormal, and do not attempt internal electrical repairs yourself.
Bottom line
Match three things: microwave model number, glass plate diameter and centre fitting. The diameter is useful for identifying a replacement, but it is not enough to guarantee compatibility. Confirming the model-specific part is the most reliable way to avoid ordering the wrong turntable.
Further reading
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