Furnace Filter Sizes: Complete List
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Read the 3 numbers on the edge of your old filter. The last one is the thickness: 16x25x1 is a 1 inch filter.
No numbers on your filter? Here is how to measure it.
Popular sizes
Popular part numbers
Your filter is 4 3/8 or 5 1/4 inches deep? It is often a Honeywell or an M-1056. Find it by the number printed on the frame. Honeywell prints 4 inch on these filters, even if they are a little deeper.
Honeywell
M-1056 series
All other sizes
1 inch23 more
2 inch17 more
4 inch6 more
5 inch2 more
Not here? Send us your size, with the brand and the model. A photo of the edge of the filter helps.
Other part numbers5 more
Not here? Send us the number printed on the frame, with the brand and the model. A photo of the edge of the filter helps.
Can't read the numbers?
If the print has worn off, measure the filter itself with a tape. Width first, then length, then thickness.
Filter sizes are rounded off, and every brand does it. A filter sold as 16x25x1 really measures about 15 1/2 x 24 1/2 x 7/8. So round your measurement up to the nearest inch and you'll land on the right size.
Found your size? Here's what people ask next
- How often should I change it?
- What does the MERV number mean?
- MERV 8 or MERV 11, which one do I need?
- Which way does it go in?
- How do I change it?
Size list kept up to date.